LED Design Cookbook

64
2Q 2010 www.ti.com/led LED Reference Design Cookbook

description

Stuff about LED lighting. (c) Texas Instruments!

Transcript of LED Design Cookbook

  • 2Q 2010www.ti.com/led

    LED Reference Design Cookbook

  • LED Reference Design Cookbook TexasInstruments2Q2010

    LED Reference Design Cookbook

    Table of Contents

    2

    ArticleLED

    ConfigurationDimming Options VIN VOUT (VDC) IOUT (mA) Device Page

    LED Drivers

    TRIAC Dimmable LED Lighting Reference Design 3 to 5 series TRIAC 120 and 230 V 14 to 17 V 325 TPS92010 4

    10-Watt, AC/DC LED Driver 3 to 6 series 120 to 290 VAC 24 typical 350 TPS92010 6

    Dimmable LED Lighting Driver for Lightbulb Retrofit Apps 9 to 11 series TRIAC 90 to 265 V 28 V 350 TPS92210 8

    Low-Cost AC/DC TRIAC Dimmable Driver Replacement for Lightbulb

    7 to 9 series TRIAC dimmer 90 to 130 VAC 24 to 32 450 TPS92001 10

    110-Watt, Constant-Current, Isolated Driver with PFC 7 to 15 series (up to 4 strings)

    Analog or PWM 90 to 265 VAC 22 to 60 500 UCC28810 12

    100-Watt, Constant-Current, Non-Isolated Driver with PFC 15 to 30 series PWM 90 to 265 VAC 55 to 100 900 UCC28810 14

    240-W LED Lighting System 6 series PWM 108 to 305 VAC 70 to 85 3000 TPS92020UCC28810UCC28811

    16

    Constant Current Driver with PFC 3 to 13 series 180 to 265 VAC 10 to 48.5 700 UCC28810 18

    LED Streetlight Driver Based on SEPIC Topology 80 series TRIAC dimmer 150 to 264 VAC 300 max 350 UCC28810 20

    25-Watt Dimmable Driver with PFC 10 series TRIAC dimmer 85 to 305 VAC 33 to 38 700 UCC28810 24

    Nonsynchronous Boost LED Driver 10 series (1 or 2 strings)

    9 to 18 VDC 40 max 700 or 350 TPS40211 26

    Wide-Input DC Voltage Range SEPIC Driver 4 series 8 to 40 VDC 13 typical 350 TPS40211 28

    Article Standard Description TI Devices Page

    Lighting Communications and Control

    TMS320C2000 Power-Line-Communcations Modem Eval Kit

    EN50065 IEC 6100-3 OFDM and S-FSK PLC Modem Kit TMS320C2000OPA564PGA112

    30

    Digital Addressable Lighting Interface (DALI) DALI DALI Reference Design Using MSP30 MCU MSP430 MCU 32

    ArticleLED

    ConfigurationDimming Options VIN VOUT (VDC) IOUT (mA) Device Page

    LED Drivers

    DC/DC LED Developers Kit 8 strings (1-10 LEDs per string)

    PWM 12 to 24 VDC 12 to 40 V 8X 1A Piccolo MCU

    33

    3-Watt Solar Lantern 3 series Analog or PWM 4.5 to 7.4 VDC 10.5 typical 350 TPS61165 34

    High-Brightness LED Driver with Switch Control 9 to 11 series Linear 4.5 to 42 VDC 42 max 500 TL4242 36

    High-Brightness LED Driver with Single-Clock Operation 8 parallel (up to 8 strings)

    Pending 3.0 to 5.5 VDC 2.0 to 17.0 V 120 per channel

    TLC5917 38

    Wireless-Controlled Triple LED Driver 3 parallel (tricolor) 4.5 to 5.5 VDC 3 typical 300 per LED TPS62260 40

    Low-Voltage Buck Boost for LED Torch 1 Dual level 1.2 to 5 VDC 5 typical 600 TPS63000 42

    Boost Driver with Integrated Power Switch 4 to 8 series Analog or PWM 5 to 12 VDC VIN to 38 2000 max TPS61500 44

    1.5-A White LED Driver for Notebooks Up to 10 per channel

    (up to 6 channels)

    PWM 5 to 24 VDC VIN to 38 Six 25-mA current sinks

    TPS61180TPS61181TPS61182

    46

    Multichannel PWM Power Driver for Power LED Applications

    4 strings (15 series each)

    Digital or PWM 2 to 50 0 to 49.5 2500 max DRV9812 48

    Small LCD Backlight with Digital and PWM Dimming 10 series Digital or PWM 3 to 18 VDC 26 or 38 max

    700 max TPS61160/1 50

    Small LCD Backlight from LDO 4 parallel (2 banks of 2)

    2.5 to 5.5 VDC 3 typical 25 per LED TPS7510x 52

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  • LED Reference Design Cookbook 3

    TexasInstruments2Q2010 LED Reference Design Cookbook

    LED Reference Design CookbookHelpingYouSolveYourLightingDesignChallenges

    TheLEDReferenceDesignCookbookisdesignedtoprovideyouwithavaluabletooltohelpyousolveyourlightingdesignneeds.CustomersseekingthelatestininnovativeandaffordableLEDlightingsolutionscanbenefitfromTIsbroadproductportfolioofAC/DC,DC/DC,LEDdrivers,powermanagementdevices,wirelessandwiredinterfacecontrolandembeddedprocessors.

    Designershavetheoptionofnotonlycontrollingthepowerstage,butregulatingLEDcurrentsaswell,eliminatingtheneedformultiplecomponentsandreducingsystemcost.Systemscanbedesignedtoaccuratelycontrolvoltageandcurrentregulationforpreciselightintensityandcolormixing,temperaturemonitoringtopreventthermalrunaway,intelligent/adaptivedimming,andfaultdetection(overvoltage/current,blownstring).Communicationwithexternalsystemsisalsopossibleviapower-linecommunication(PLC),wirelesstechnologyorinterfaces.

    LEDlightingdesignersarechallengedwithmeetingtheirefficiencyandreliabilitygoalsfasterinadvancedlightingdesigns.TIslightingportfolioishelpingdesignersachievetheirgoalsatafasterrate.

    ToseetheTIsolutionsforgenerallighting,signage,backlightingandautomotive,allcomplimentedbyacomprehensivecustomersupportnetwork,visit:

    TI has Solutions for Your Lighting Challenges: Precisionchannel-to-channelandchip-to-chipaccuracytocreatethebesthueandluminanceinyourRGBmessageboardsandvideodisplays

    Smallfootprint,highestefficiency,programmableLEDorOLEDbacklightcontrollers

    Blinkinglow-powerLEDstoactasindicatorsinanautomotivedisplayorinacasinogame

    ControllerstopoweranddimhighbrightnesswhiteorRGBLEDsforarchitecturalluminariesandportablelighting

    PoweringarraysofHBLEDsoffanACsourceforuseinstreetlightingandreplacinghigh-intensitydischarge(HID)lamps

    HighlyintegratedZigBeetransceiversandSoCsolutionsforwirelesslightingcontrolandhomeautomation

    ArticleLED

    ConfigurationDimming Options VIN VOUT (VDC) IOUT (mA) Device Page

    LED Drivers

    Medium-Size LCD Backlight 3 series Digital or PWM 3 to 12 VDC 5 typical 820 max TPS61165 54

    Large-LCD Backlight Driver Up to 96(12 series, 8 strings)

    Analog or PWM 4 to 24 VDC 16 to 48 320 TPS61195 56

    24-Channel, 12-Bit PWM LED Driver 24 parallel Digital or PWM 3.0 to 5.5 VDC 2.0 to 17.0 V 40 per channel TLC5951 58

    24-Channel, Constant-Current LED Driver with Global Brightness Control

    24 parallel Digital 3.0 to 5.5 VDC 2.0 to 17.0 V 35 per channel TLC5952 60

    16-Channel LED Driver with Load-Switch Dimming Control 16 parallel PWM or Analog 3.0 to 5.5 VDC 17 max 100 per channel

    TLC59116 62

    www.ti.com/led

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  • LED Reference Design Cookbook TexasInstruments2Q2010

    TRIAC Dimmable LED Lighting Reference Design

    TPS92010

    TRIAC Dimmable LED Lighting Reference Design

    TPS92010

    4

    Description ThisdesignusestheTPS920108-pin,high-efficiencyoff-lineLEDlightingcontroller.Thiscontrollerincorporatesmanyfeatures,suchasfrequencyfold-backandalow-powermode,toimplementalow-cost,high-efficiencyflybackconverter.

    AnapplicationofthisconverterisretrofittinglightbulbswithLEDs.Theconvertercandrive3to5high-brightnessLEDsinserieswithaconstantcurrentof0.35A.

    Theflybacktopologyischosenbecauseitallowsalowercomponentcountandlowercostthanother

    Efficiency without Dimmer

    Dimming Performance

    Output Current Regulation

    Key Features AC/DCTRIACdimmableLED

    referencedesign Idealforresidentiallighting 3-to12-Wapplications Highefficiency TIlosslessdimmingcircuitfora

    cooler,lower-powersystemduringdeepdimming

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS92010

    Efficiency with Dimmer

    topologies.LEDcurrentissenseddirectlytoensureitstightregulation.AspecialcircuitforcompatibilitywithTRIACdimmersadjuststheoutputcurrentlinearly,avoidinganystroboscopiceffectsoraudiblenoisethatmightotherwiseoccur.TheTPS92010isdesignedforlow-powerlightingapplicationsthatdonotrequirepower-factorcorrection.

    Design Specifications

    Parameter Minimum Typical Maximum

    Input voltage (VAC) 100 120 130

    Output voltage (VDC) 9 18

    Output current (A) 0.35

    Efficiency (%) 80

    Adjusting the Output Current

    Output Current(A)

    R15(W)

    R17(W)

    R1(W)

    R42(W)

    0.20 1000 150 330 1000

    0.225 1200 86 390 1000

    0.25 1200 220 470 1000

    0.275 1000 560 680 680

    0.30 1500 220 680 680

    0.325 1500 330 470 1500

    0.35 1000 1000 820 1000

    0.40 1800 470 1000 1000

    0.45 2200 390 1500 1000

    0.50 2700 220 1500 1000

    0.60 3300 150 1500 1500

    0.70 3900 270 2200 1500

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  • TexasInstruments2Q2010 LED Reference Design Cookbook

    TRIAC Dimmable LED Lighting Reference Design

    TPS92010

    5

    TRIAC Dimmable LED Lighting Reference Design

    TPS92010

    Design Specifications

    Parameter Minimum Typical Maximum

    Input voltage (VAC) 100 120 130

    Output voltage (VDC) 9 18

    Output current (A) 0.35

    Efficiency (%) 80

    Adjusting the Output Current

    Output Current(A)

    R15(W)

    R17(W)

    R1(W)

    R42(W)

    0.20 1000 150 330 1000

    0.225 1200 86 390 1000

    0.25 1200 220 470 1000

    0.275 1000 560 680 680

    0.30 1500 220 680 680

    0.325 1500 330 470 1500

    0.35 1000 1000 820 1000

    0.40 1800 470 1000 1000

    0.45 2200 390 1500 1000

    0.50 2700 220 1500 1000

    0.60 3300 150 1500 1500

    0.70 3900 270 2200 1500

    Form

    orereferencede

    sign

    s,see:w

    ww.ti.com

    /pow

    erreferenced

    esigns

    11

    1 1

    1

    4

    U3

    PS2801C-1

    R12

    1.0k

    R6

    12.0k

    R5

    10.0k

    R20

    0.39

    C5

    1nF

    R41

    1.20M

    R14

    4.70k

    R36

    270k

    Q3

    2N7002

    U2

    TL431A

    C12

    10nF

    R42

    1.50M

    R1

    470k

    R117

    4.70k

    R43

    39.0k

    C20

    1nF

    R22

    3.30M

    R21

    3.30M

    R24

    4.70M

    R33

    3.3M

    R39

    47.0k

    L150mH

    D2

    BAW56GS08

    R29

    4.70k

    R32

    3.3M

    R35

    470k

    SI0V1

    S05K150

    TP1

    Input: 100 to 130 V

    AC

    L NTP2

    R7

    470k

    R23

    4.70M

    C2

    1nF

    C23

    100nF U4

    TPS92010

    C4

    330pF

    C19

    4.7F

    C18

    4.7F

    C21

    100pF

    R2

    270k

    R31

    270k

    R16

    4.70

    D1

    MB6S

    R10

    560

    C3

    1nF

    R25

    1.00M

    C11

    0.1F

    R13

    33.0k

    R15

    1.50k

    R17

    330

    See tab

    le for resistor selection to m

    odify output current.

    R27

    2.49k

    C22

    0.1F

    R26

    1.00MR

    1110.0kR19

    8.20k

    R18

    68k

    R8

    330

    Q2

    SPD02N80C3

    C8

    1F

    C7

    47pF U1: B

    LM358A

    DR38

    1.00M

    C14

    0.1F

    C10

    22nF

    C16

    220nF

    R34

    100k

    R40

    220

    DIM

    Q6

    Q4

    FMMT458

    R30

    22.0k

    D3

    MB6S

    R28

    27.0

    R37

    1.00M

    C17

    10nF

    R4

    2.70k

    TP3

    Output: 0.325A/14V

    to 17V + VLE

    D

    VLE

    DTP4

    U1: A

    LM358A

    DR3

    8.20k

    C9

    100pF

    R9 2.70k

    C15

    0.1F

    D4

    SS26

    C13

    1F

    C1

    1F

    C6

    1F

    3

    1 2

    86

    732

    51

    82 3

    1

    4

    64

    1 1 2 3 4

    8 7 6 5

    3

    1

    1

    67

    5

    1

    1

    1

    SS

    FB PCS

    GND

    LPM

    VSD

    VDD

    GD

    BC817-25

    Q5

    BC817-25

  • LED Reference Design Cookbook TexasInstruments2Q2010

    10-Watt, AC/DC LED Driver

    TPS92010 PMP3522

    6

    Description ThePMP3522isareferencedesignthatutilizestheTPS92010highefficiencyLEDlightingdrivercontroller.

    Residentialdownlightinghasseenagreatdealoftransitiontomoreefficientsourcesoflight.CompactCFLshavebecomeamainstayinresidentiallighting,butasthelifetimecostofLEDlampsfalls,allthemorelow-power,small-form-factordesignswillbeneeded.Thisreferencedesignisanunder-10-W,non-isolatedSEPICLEDdriverspecificallylaidoutforresidentialdownlighting.

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS92010

    PMP3522 Schematic

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 120 290 VAC

    Output voltage 24 Volts

    Output current 0.350 Amp

    TPS92010

    C101nF

    C20.1F

    C510F

    C60.1F

    D2BZX84C20T

    C10.047F275VAC

    R8

    10

    R7100K

    Q1FCD4N60

    L3180H

    J2

    R90.1

    R126.11K

    R133.3

    R143.3

    3 - 6 LEDs @ 350mALET RTN

    R11100

    C7

    0.1F

    R10100 Q2

    MMBT3904LT1

    R4100

    R3220K

    R2220K

    R1220K

    TP2

    D6BAT54S

    D3MMBD4148

    C9470F

    C1110F

    D4MURA160T3

    D5BZX84C27T

    R1533.2K

    C31nF

    C447nF

    LPMVSDVDDGD

    1

    2

    3

    4

    1

    2 AC

    AC

    8

    7

    6

    5

    1 2

    2

    1

    3 4

    SSFBPCSGND

    L11mH

    F10.5A

    D1RH05-T

    AC IN120 - 290VAC

    J1

    L21mH +

    +

    +

    + +

    Key Features Single-stageSEPIC,PFC+LED

    currentregulation Low-cost,low-componentcount Drives3to6LEDsat350mA

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    10-Watt, AC/DC LED Driver

    TPS92010 PMP3522

    7

    10-Watt, AC/DC LED Driver

    TPS92010 PMP3522Laid Out for Bulb Replacement

    Regulation

    Efficiency

    Control Loop Frequency

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Dimmable LED Lighting Driver for Lightbulb Retrofit Apps

    TPS92210EVM

    Dimmable LED Lighting Driver for Lightbulb Retrofit Apps

    TPS92210EVM

    8

    Description TheTPS92210EVMisanaturalpower-factor-correction(PFC)LEDlightingdrivercontrollerwithadvancedenergyfeaturestoprovidehigh-efficiencycontrolforLEDlightingapplications.TheTPS92210EVMiscapableofprovidingahighpowerfactor,TRIACdimming,loadprotectionandextendedlifeinasmallspaceatlowcost.

    TheTPS92210EVMemploysquasiconstantontimethatenablessingle-stagePFCinanisolatedflybackconfiguration.Intendedfor

    Key Features AC/DCTRIACdimmableLEDdriver

    withPFC Idealforresidentiallighting Singlestage(PFCandLED

    currentregulation) 12-to25-Wapplications DeepTRIACdimmingcapability

    Web Linkswww.ti.com/tps92210evm

    TPS92210EVM Block Diagram

    low-powerlightingapplications,itcanbepackagedinavarietyofways,includingindividuallampdesignsandgenericPCBformfactorsformanytypesoflighting.Thedriverpreservesdimmerholdingcurrentandfeaturesdual-slopeoutputcontroltoimprovedimminglinearitywhenusedwithcommonTRIAC-basedphase-controldimmers.TheTPS92210controllerisprogrammedtooperateatafixedfrequencywithaconstantontimefortheinternalswitchthatdrivestheprimarypowerFET.

    VDD

    OOP

    CGD

    CSD

    FB

    OTM

    PCM

    GND

    FEEDBACK

    C

    RCS

    Primary Secondary

    1

    4

    3

    7

    8

    2

    8

    5

    Phase AngleDetection

    SupplementalLoad

    Current Referenceand

    Difference Amplifier

    TPS92210

    Description Parts VIN RangeVOUT (DC) Range

    Number of LEDs

    IOUT(max)

    POUT(max) Eff. PFC ISO

    Dimming In

    Dimming Out

    TPS92210EVMHigh efficiency, PFC and TRIAC dimmable LED lighting driver

    TPS92210 180 V 265 V 17 V 21 V 6 350 mA 11 W 83% Yes Yes TRIAC Linear

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    NEW!

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Dimmable LED Lighting Driver for Lightbulb Retrofit Apps

    TPS92210EVM

    9

    Dimmable LED Lighting Driver for Lightbulb Retrofit Apps

    TPS92210EVMLED Lighting Drivers Efficiency LED Lighting Drivers Total Harmonic Distortion

    LED Lighting Drivers PFC

    LED Lighting Drivers Current RippleLED Lighting Drivers Current Regulation

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Low-Cost AC/DC TRIAC Dimmable Driver for Lightbulb

    TPS92001 PMP4981

    10

    Description ThePMP4981isareferencedesignforanLEDdriverinalightbulb-replacementcircuit.ThedesignisoptimizedtofunctionwithACinputsourcesthatmaybefedthroughanindustry-standardTRIAC-basedphase-cutdimmer.

    PMP4981 Schematic

    Design Specifications

    Description Parts

    VIN (AC) Range

    VOUT (DC) Range

    Number of LEDs

    IOUT (max)

    POUT (max) Eff. PFC ISO

    Dimming In

    Dimming Out EVM

    PMP4885 low- cost offline

    TPS92001 90 247 to 9 450 mA 12 W 79% No No TRIAC PWM Paper

    LED lighting driver TLC372 130 32

    ThePMP4981sdimmingfunctionallowsthestringofLEDstobedimmedtoverylowlevelswithoutflickeringorstroboscopiceffects.CurrentisdrawnfromtheTRIAConlywhenneeded,providinghighefficiencywithanon-isolateddriverforavery-low-costsolution.Thissinglestageprovideshighreliability,longlifeandhighperformance.

    +

    U1TPS92001

    L2470

    R230

    L11.2mH

    +

    VDD

    R910K

    D2MURA120T3

    D1MURA120

    D412V

    D5301V Q2

    FQT4N25

    Q1FZT757A

    R710KTP8

    TP1

    TP4

    TP7

    TP2

    LED+LED

    R61R81

    R121K

    R410

    R3301KR5

    2KC6100p

    C7.01U

    C10.01

    R1028K

    C91000P

    C1.1

    R11100K

    C8.01

    C34.7F

    C20.1UC5

    1FR12.10K

    C11.01

    C131.0U

    U2:ATLC372CD

    VDD

    REF

    REF

    20 VACTRIAC Dimmer

    TP3

    TP6TP5

    C40.047F

    200V

    C150.01F200V

    3

    1

    1234

    8765

    56

    7

    +

    2

    4AC

    AC

    D3RH04-T

    FBSSRT1RT2

    REFVDDOUTGND

    8

    4

    1

    C121.0

    D7 15V

    D615V

    R1940.2K

    R1640.2K

    R15200KR17

    560

    Q3BF720

    Q43906

    R188.06K

    TP9

    C141

    U2:BTLC372CD

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    Key Features Low-cost,AC/DCTRIACdimmable

    LEDdriverlightingreferencedesign Idealforresidentiallighting LEDripplecurrent100%(120Hz) 6-to11-Wapplications DeepTRIACdimmingcapability Noelectrolyticcapacitorsoption

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Low-Cost AC/DC TRIAC Dimmable Driver for Light

    TPS92001 PMP4981

    11

    Low-Cost AC/DC TRIAC Dimmable Driver for Lightbulb

    TPS92001 PMP4981Line Current and Voltage Dimmer at Full Power Position

    LED Current and Voltage Dimmer at Full Power Position Rectified AC (Top) and LED Current (Bottom) High Conduction Angle

    Line Current and Voltage Dimmer at ~ Half Power Position Rectified AC (Top) and LED Current (Bottom) Low Conduction Angle

    LED Current and Voltage Dimmer at Half Power Position

  • LED Reference Design Cookbook TexasInstruments2Q2010

    100-Watt, Constant-Current, Non-Isolated Driver with PFC

    UCC28810/UCC28810EVM-002

    12

    Description TheUCC28810EVM-002evaluationmodule(EVM)isaconstant-currentnon-isolatedpowersupplyforLEDlightingapplicationsthatrequirehighbrightness,suchasstreet,parkingorarealighting.Thereferencedesignconvertstheuniversalmains(90to265VRMS)toa0.9-Aconstant-currentsourcetodrivea100-WLEDload.

    TheUCC28810EVM-002isatwo-stagedesign.Thefirststage,atransition-modecircuitwithPFC,ensuresthatthedesignmeetsvariousstandardssuchastheEN61000-3-2.ThePFCcircuitconvertstheACinputtoaregulatedDCvoltage,whichcanbeconfiguredasaboost-followerPFCorafixedoutputvoltage.Theboost-

    Key Features High-powerAC/DCLEDdriver

    withPFC Idealforstreet,parkingorarea lighting Universal-input,non-isolateddesign TightlyregulatedLEDcurrent PWMdimming,200Hzto1kHz Highefficiencythroughdimming Activepower-factorcorrection

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/UCC28810

    Reference designs:www.ti.com/powerreferencedesigns

    EVM:www.ti.com/ucc28810evm-002

    UCC28810EVM-002 Block Diagram

    Design Specifications

    Description Parts

    VIN (AC) Range

    VOUT (DC) Range

    Number of LEDs

    IOUT (max)

    POUT (max) Eff. PFC ISO

    Dimming In

    Dimming Out EVM

    UCC28810 EVM002 100-W

    UCC28810 90 5515-30 900 mA 100 W 93% Yes No PWM PWM Yes

    LED lighting driver UCC28811 265 100

    followerPFCtrackstheACinputspeakvoltageforincreasedefficiencyatlow-lineoperation.ThePFCsDCoutputvoltageisthenregulatedtoafixedvalueintheregionof396VDC.Thesecondstageofthedesignalsousestransitionmodebutisconfiguredasabuckconverter.ItconvertsthePFCoutputvoltagetoafixed0.9-AcurrenttodriveanLEDload.ThesecondstageacceptsPWMdimminginputs(eitherexternallyorfromanonboardcircuit)andappropriatelytogglesitselfonoroff.

    PFC Boost

    Enable

    BiasBias

    PFC Output

    LED PWMInput

    Critical Conduction ModeLow Side Buck Current Source

    PrimaryGnd

    UCC28810

    TZE

    VDD

    GDRV

    ISENSE

    GND

    EAOUT

    VINS

    VSENSE

    6

    2

    3

    1

    5

    8

    7

    4

    UCC28811

    VDD

    GDRV

    GND

    TZE

    VSENSE

    EAOUT

    VINS

    ISENSE

    1

    2

    3

    4

    8

    7

    6

    5

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    100-Watt, Constant-Current, Non-Isolated Driver with PFC

    UCC28810/UCC28810EVM-002

    13

    100-Watt, Constant-Current, Non-Isolated Driver with PFC

    UCC28810/UCC28810EVM-002Efficiency and Power Factor vs. Line Voltage

    UCC28810EVM-002 transition mode buck PWM response (expanded). Ch1: LED VOUT, Ch2 PWM, Ch3 buck inductor current 500 mA/Div, Ch4 VDS Ch1 and Ch4 Share GND reference.

    PWM Dimming Response

    UCC28810EVM-002 efficiency and power factor vs. line voltage 30 Cree XRE LEDs at 900 mA. LED current regulation as a function of line voltage.

    Line Regulation 30 LEDs at 900 mA, (98 W)

    PWM Dimming Waveforms

    UCC28810EVM-002 transition mode buck PWM response. Ch1: Buck VIN, Ch2: Buck VDS, Ch3: LED current (0.5 A/Div), Ch4: LED voltage. Ch1 and Ch4 share GND reference.

    THD Factor vs. Line Voltage

    UCC28810EVM-002 THD vs. line voltage 30 Cree XRE LEDs at 900 mA.

  • LED Reference Design Cookbook TexasInstruments2Q2010

    14

    110-Watt, Constant-Current, Isolated Driver with PFC

    UCC28810/UCC28810EVM-003: SimpLEDriveDescription TheUCC28810EVM-003evaluationmodule(EVM)isanoff-lineAC-to-DCLEDcurrentdriverwithPFCforapplicationssuchasstreet,high-bay,andmedium-orlarge-infrastructurelighting.TheUCC28810EVM-003isathree-stageconverterdesignthatdeliversupto110W.Thefirststageisauniversalinputboost-PFCcircuitprovidinga305-to400-VDCoutput.Thesecondstageisalow-sidebuckcircuitprovidingthecontrolledcurrentsource,andthethirdstageisaseriesoftwohalf-bridgeDC/DCtransformersthatprovidesisolationofmultipleLEDstrings.

    Thispatent-pendingsolutionprovidesaneasilyscalableandcost-effectivemethodofdrivingmultipleLEDstrings.TheUCC28810EVM-003implements

    UCC28810EVM-003 Block Diagram

    Design Specifications

    Description Parts

    VIN (AC) Range

    VOUT (DC) Range

    Number of LEDs

    IOUT (max)

    POUT (max) Eff. PFC ISO

    Dimming In

    Dimming Out EVM

    UCC28810 EVM003 100-Wisolated multi-string LED lightingdriver w/multiple transformers

    UCC28810

    UCC28811

    TPS92020

    90, 265 22 V, 60 V 4X (7 - 15)500 mA 110 W 91% Yes Yes PWM PWM Jul-09

    single-referencecurrentcontrolanduniversaldimming(viaAMorPWM)forallLEDs.ThereferencedesigneffectivelydrivesalargenumberofLEDsconnectedinseries,butthevoltageontheLEDstringsissafe(low)andisolatedfromtheACline.Themultistringarchitectureismorecost-effectivethananarchitecturewithaconstantvoltageplusabuckstageforeachLEDstring.TheLED-driverarchitectureisreadilyscalabletoveryhighpowerlevels.ExcellentLEDcurrentmatchingbetweenstringsisachievedwiththisarchitecture.TheUCC28810EVM-003achieveshighefficiency(91%),highpowerdensityandahighpowerfactor.Thecontrolstageisasimpleandrobustdesign,andtheEVMprotectsagainstscenarioswithopenandshortLEDstrings.

    Key Features SimpLEDrivehigh-power

    dimmableAC/DCLEDdriverwithPFC

    Idealforstreet,high-bayorinfrastructurelighting

    IsolatedfromtheACline Readilyscalabletohigherpower

    levels LEDcurrentmatchingbetween stringsHighefficiencyandpowerdensityActivepower-factorcorrection

    Web LinksReference designs:www.ti.com/powerreferencedesigns

    Datasheets, users guides, samples:www.ti.com/sc/device/UCC28810

    EVM:www.ti.com/ucc28810evm-003

    PFC Boost Follower

    Enable

    +50 - 60V

    +50 - 60V+50 - 60V

    +50 - 60V

    BiasBias

    Bias

    PFC Output

    LED PWMInput

    Critical Conduction ModeLow Side Buck Current Source

    PrimaryGnd

    UCC28810

    TZE

    VDD

    GDRV

    ISENSE

    GND

    EAOUT

    VINS

    VSENSE

    6

    2

    3

    1

    5

    8

    7

    4

    UCC28811

    VDD

    GDRV

    GND

    TZE

    VSENSE

    EAOUT

    VINS

    ISENSE

    1

    2

    3

    4

    8

    7

    6

    5VCC

    GD1

    GND

    GD2

    RT

    DT

    SS

    TPS92020

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    15

    110-Watt, Constant-Current, Isolated Driver with PFC

    UCC28810/UCC28810EVM-003Efficiency vs. Line Voltage

    UCC28810EVM-003 IOUT matching vs. line voltage 4 x 15 Cree XRE LEDs at 500 mA.

    Ch1: VBUCK+, Ch2: Buck VDS, Ch3: AC line current 1A/Div, Ch4: VBUCK - Ch1 and Ch 4 share GND reference.

    Power Factor vs. Line Voltage UCC28810EVM-003 AC Input Current During PWM Dimming

    IOUT Matching vs. Line Voltage

    UCC28810EVM-003 efficiency vs. line voltage and load 4 x 15 Cree XRE LEDs at 500 mA.

    UCC28810EVM-003 power factor vs. line voltage 4 x 15 Cree XRE LEDs at 500 mA.

    PFC Boost Follower

    Enable

    +50 - 60V

    +50 - 60V+50 - 60V

    +50 - 60V

    BiasBias

    Bias

    PFC Output

    LED PWMInput

    Critical Conduction ModeLow Side Buck Current Source

    PrimaryGnd

    UCC28810

    TZE

    VDD

    GDRV

    ISENSE

    GND

    EAOUT

    VINS

    VSENSE

    6

    2

    3

    1

    5

    8

    7

    4

    UCC28811

    VDD

    GDRV

    GND

    TZE

    VSENSE

    EAOUT

    VINS

    ISENSE

    1

    2

    3

    4

    8

    7

    6

    5VCC

    GD1

    GND

    GD2

    RT

    DT

    SS

    TPS92020

  • LED Reference Design Cookbook TexasInstruments2Q2010

    240-W LED Lighting System

    TPS92020, UCC28810/1

    240-W LED Lighting System

    TPS92020, UCC28810/1

    16

    Description ThisreferencedesignusestheUCC28810,UCC28811andTPS92020foranisolated,off-line,240-WLEDdriverforhigh-bayandstreetlightapplications.Thedriverhasthreestages:apower-factor-correction(PFC)stage,abuckstageandanisolationstage.ThePFCandbuckstagesbothoperateincritical-conductionmode.Theisolationstageisahalf-bridgeconverterwithanoptiontoadoptamulti-transformerconfiguration.Aconstantoutputcurrentiscontrolledwithinthebuckstagetoprovide3AtotheLEDstrings,withanoutputvoltagerangingfrom70Vto85V.

    TPS92020, UCC28810/1 Schematic

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS92020,www.ti.com/sc/device/UCC28810 orwww.ti.com/sc/device/UCC28811

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    Design Specifications

    Parameter Test Conditions Minimum Typical Maximum Unit

    Input voltage 108 120/277 305 VRMS

    Power factor 0.990

    Output current 3 Amp

    Output ripple COUT = 4.4 F 300 mAPP

    Output voltage 70 85 Volts

    Efficiency 87 %

    UCC28810

    TZE

    VDD

    GDRV

    ISNS

    GND

    EAOUT

    VINS

    VSNS

    ENABLE LED PWMInput

    PFC Output CC Buck Output

    PFC Boost Follower

    Primary GND

    Critical Conduction Mode Low Side Buck Current Source

    Half BridgeDC Transformer

    Bias

    1

    2

    3

    4

    5

    6

    7

    8

    UCC28811

    VDD

    GDRV

    GND

    TZE

    VSNS

    EAOUT

    VINS

    ISNS

    1

    2

    3

    4

    8

    7

    6

    5

    TPS92020

    VCC

    GD1

    GND

    GD2

    RT

    DT

    SS

    Bias

    Bias

    +70V to 85V3A

    NEW!

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    240-W LED Lighting System

    TPS92020, UCC28810/1

    17

    240-W LED Lighting System

    TPS92020, UCC28810/1Power Factor Power Factor

    Load Regulation Load Regulation

    Efficiency Efficiency

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Constant Current Driver with PFC

    UCC28810 PMP4501

    18

    Description ThePMP4501isanisolated,off-line,AC-to-DCLED-currentdriverwithPFCforapplicationssuchascommercialfixturelightingandgeneralisolatedLEDdrivers.ThePMP4501isasingle-stageflybackPFCconverterthatdeliversupto34Wwitha180-to265-VACinputvoltagewhileprovidinga10-to48-Voutputvoltageataconstantoutputcurrentof700mA2%.

    ThePMP4501implementssecondary-sidecurrentcontrolfortheLEDstring.Overvoltageprotection

    Key Features IsolatedsinglestageLEDdriver NaturallyhighPFC 90%efficient Universalinputvoltagerange 700-mAoutputcurrent LowLEDripplecurrent

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/UCC28810

    PMP4501 Reference Design Schematic

    L11mH

    D1DF06S

    C10.1F

    L220mHT

    P1

    TP2

    C30.15F275VAC 3

    2

    4 1

    F11A/250V

    C11

    C922nF

    C14DNP

    R1911K

    R141.5M

    R91.5M

    R1100K

    R4100K

    R710K

    Q1PZT2222A

    R82.2

    D2BYG10M

    D3BYG10M

    R6100K

    C6100F25V

    C11.1

    C1210pF

    R106.98K

    R22330

    R2047.5K

    R2147.5K

    R230.82

    4

    3

    32

    56

    7

    8

    12

    A

    5

    4

    7

    8

    2

    1

    9

    10

    1

    4

    1

    2

    R1610

    +

    C747F63V

    D4S1KB

    D6BAS16

    D815V

    D7MURA140T3

    D11MBR0520L

    U3TCMT1107

    D13BAW56

    D1212V

    D9MURA120T3

    D5PDU540-13

    T1G094010LF

    +

    R222KR322K

    C210nF

    C1047F35V

    C81000pF Y1

    Q3 3904

    +

    C4470F63V

    + C5470F63V

    +

    C1547F35V

    C161F

    R2710K

    R2610K

    R283.32K

    R242.21K

    R111K

    R1223.7K

    R131K

    R50.15

    J110V...48V . 700mAGND

    U1:BTL103WID

    R172.49K

    D1051V

    TP3

    TP5

    TP4

    R2510K

    U1:ATL103WID

    C17220F

    C131

    +

    Q2STB7NK80ZT4

    U2UCC28810D

    8765

    1234

    VDDGDRVGNDTZE

    VSNSEAOUTVINSISNS

    R1810K

    For Test PurposeOnly. R17=50

    preventsdangerousoutputvoltagesfromoccurringduringopen-stringconditions.Acurrent-senseamplifierreducesthesensingresistorspowerdissipation,thusincreasingoverallefficiency.TheinternalreferencevoltageoftheoperationalamplifierachievesexcellentLED-currentregulationversusoutputpowerandinputvoltage.ThePMP4501achieveshighefficiency(90%peak),highpowerdensityandahighpowerfactor.ThereferencedesignprotectsagainstscenarioswithopenandshortLEDstrings,andthecontrolstageisasimpleandrobustdesign.

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    Design Specifications

    Description Parts

    VIN (AC) Range

    VOUT (DC) Range

    Number of LEDs

    IOUT (max)

    POUT (max) Eff. PFC ISO

    Dimming In

    Dimming Out EVM

    UCC28810 PMP4501 34-W

    UCC28810 180 10 V

    3-13 700 mA 34 W 89% Yes Yes No NoReference DesignSecondary side

    current loop TL103W 265 48.5 V

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Constant Current Driver with PFC

    UCC28810 PMP4501

    19

    Constant Current Driver with PFC

    UCC28810 PMP4501PMP4501 Board

    Efficiency vs. Rectified-Equivalent Line Voltage and Output Power

    Output Current Ripple. Input Voltage = 230 VAC, Output Voltage = 48 V @ 700 mA

    Power Factor vs. Line Voltage and Output Power AC Input Current and Voltage at Full Load and Nominal Input Voltage

    IOUT Regulation vs. Rectified-Equivalent Line Voltage and Output Power

  • LED Reference Design Cookbook TexasInstruments2Q2010

    LED Streetlight Driver Based on SEPIC Technology

    UCC28810 PMP3976

    20

    Description ThePMP3976circuitshownbelowwasdesignedforacommercialLEDlightingfixture.TheSEPICtopologyhastheadvantageoveraflybackconverterinthatitclampstheswitchingwaveformsonthepowersemiconductor,allowingtheuseoflowervoltageandhencemoreefficientparts.Thisprovidesanestimated2%improvementinefficiencyinthisapplication.Additionally,thereislessringingintheSEPIC,makingEMIfilteringeasier.

    TheLED-lightingcircuitusestheUCC28810transition-modeboostcontrollertoshapetheinput-currentwaveform.ThecircuitstartsbychargingC6offtheline.Oncethecontrollerisrunning,itspowerisprovidedbyanauxiliarywindingontheSEPICinductor.ArelativelylargeoutputcapacitorlimitsLEDripplecurrentto20%oftheDCcurrent.Asasidenote,theACfluxandcurrentsinthetransition-modeSEPICarequitehigh,soLitzwireandlow-loss

    PMP3976 Schematic

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 150 264 VAC

    Output voltage 300 Volts

    Output current 0.350 Amp

    corematerialarerequiredtoreduceinductorlosses.

    Thefollowingmaterialpresentslabresultsfromaprototypethatwasbuilttomatchtheschematic.EfficiencyisquitehighovertheEuropeanlinerange,peakingat92%.Thisgoodefficiencywasachievedbylimitingtheringingonthepowersemiconductors.Also,ascanbeseenfromthecurrentwaveform,thepowerfactorisquitegoodatover96%.Interestingly,thewaveformisnotpurelysinusoidalbutshowssomesteepnessontherisingandfallingedges.Thisisbecausethecircuitmeasuresswitchcurrentbutnotinputcurrent.However,thewaveformisgoodenoughtopasstheEuropeanrequirementsforharmoniccurrents.

    Key Features Non-isolatedsingleLEDstringdriver 92%efficientsolution SEPICcontrolboostsforhigh voltage Naturalsinglestagewith>0.9PFC Low-costsolutionwithfewexternal

    parts MeetsEuropeanharmonic requirements

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/UCC28810

    Reference designs:www.ti.com/powerreferencedesigns

    ++

    +

    U2UCC28810D

    HS1

    Q3SPP06N80C3

    150VAC to 240VAC Input

    LINE

    NTRL

    F11.6A/250V

    RT12.5

    C1020.22

    C1010.22F

    L14mH

    R41.1 MEG0.25W

    R111.1 MEG0.25W

    R1515K

    C100100pF

    C121000pF

    C4100pF C5

    0.1F

    C6100F25V

    C1010pF

    C81000pF

    R13100K

    R6100K

    TP5R21 511

    TP6

    TP2

    TP4

    J1+LED

    LED

    U1TLV431AIDBZ

    R8100K

    R20100K

    R1815K

    R17 301 R190.51W

    R1200K0.25W

    C20.22F

    T1750H

    C1 0.47F

    R3200K0.25W R23

    20

    R100 10

    R12 1K

    D100 MMSD914

    R1015K

    R101100K0.5W

    C3330F

    R102100K0.5W

    C71000pF

    Q2MMBT3904

    Q1MMBT2907

    D4180V

    R23.61W

    D5180V

    R9100K

    R7 200K

    R5 49.9K

    D3 MMSD914

    D1 MUR8100E

    R161K

    C922F

    C112.2F

    D2KBP06G

    +

    4

    2

    1

    3AC

    AC

    34

    21

    1

    1 1

    1

    1 1

    1

    1 1

    1

    1

    1

    12

    3

    1

    1

    1

    1

    11

    2

    4

    5

    0

    8

    7

    1

    1

    1

    VCCDRVGNDZCD

    VSNSCOMPMULTINCS

    8765

    1234

    TP1

    TP3

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    LED Streetlight Driver Based on SEPIC Technology

    UCC28810 PMP3976

    21

    LED Streetlight Driver Based on SEPIC Technology

    UCC28810 PMP3976PMP3976 Rev B Demo Board Power Factor

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 150 264 VAC

    Output voltage 300 Volts

    Output current 0.350 Amp

    The circuit is built on a PMP3976 Rev A PWB.

    ++

    +

    U2UCC28810D

    HS1

    Q3SPP06N80C3

    150VAC to 240VAC Input

    LINE

    NTRL

    F11.6A/250V

    RT12.5

    C1020.22

    C1010.22F

    L14mH

    R41.1 MEG0.25W

    R111.1 MEG0.25W

    R1515K

    C100100pF

    C121000pF

    C4100pF C5

    0.1F

    C6100F25V

    C1010pF

    C81000pF

    R13100K

    R6100K

    TP5R21 511

    TP6

    TP2

    TP4

    J1+LED

    LED

    U1TLV431AIDBZ

    R8100K

    R20100K

    R1815K

    R17 301 R190.51W

    R1200K0.25W

    C20.22F

    T1750H

    C1 0.47F

    R3200K0.25W R23

    20

    R100 10

    R12 1K

    D100 MMSD914

    R1015K

    R101100K0.5W

    C3330F

    R102100K0.5W

    C71000pF

    Q2MMBT3904

    Q1MMBT2907

    D4180V

    R23.61W

    D5180V

    R9100K

    R7 200K

    R5 49.9K

    D3 MMSD914

    D1 MUR8100E

    R161K

    C922F

    C112.2F

    D2KBP06G

    +

    4

    2

    1

    3AC

    AC

    34

    21

    1

    1 1

    1

    1 1

    1

    1 1

    1

    1

    1

    12

    3

    1

    1

    1

    1

    11

    2

    4

    5

    0

    8

    7

    1

    1

    1

    VCCDRVGNDZCD

    VSNSCOMPMULTINCS

    8765

    1234

    TP1

    TP3

  • LED Cookbook TexasInstruments2Q2010

    22

    LED Streetlight Driver Based on SEPIC Technology

    UCC28810 PMP3976Harmonic Content

    The image above shows a thermal image of the board. The ambient temperature was 26C with no forced air flow. The input was 230 VAC.

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    Efficiency and Power Factor

    Efficiency

    Harmonic Content

    The harmonic content and the EN61000-3-2 Class C (lighting equipments) Limits are shown above; input voltage was set to 230 VAC.

    IOUT VOUT VIN LIN PF POUT LossesEfficiency

    %

    0.349 245.5 150.4 0.646 0.983 85.65 9.827 89.7

    0.349 245.4 176.4 0.544 0.980 85.64 8.398 91.1

    0.349 245.3 202.6 0.473 0.979 85.61 8.208 91.3

    0.350 245.3 226.3 0.430 0.975 85.86 9.201 90.5

    0.350 245.3 248.4 0.399 0.969 85.86 10.184 89.4

    0.350 245.3 265.7 0.378 0.962 85.86 10.763 88.9

    IOUT VOUT VIN LIN PF POUT LossesEfficiency

    %

    0.348 303.9 149.9 0.803 0.988 105.75 13.168 88.9

    0.349 303.3 175.2 0.677 0.983 105.85 10.742 90.8

    0.349 303.8 199.9 0.588 0.984 106.03 9.634 91.7

    0.349 303.3 224.8 0.527 0.983 105.85 10.604 90.9

    0.349 303.2 249.8 0.482 0.978 105.82 11.938 89.9

    0.349 303.0 264.2 0.461 0.975 105.75 13.004 89.0

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    LED Streetlight Driver Based on SEPIC Technology

    UCC28810 PMP3976

    23

    Frequency Response

    MOSFET Voltage Waveform

    The frequency response of the feedback loop is shown in the plot above. The input was set to 220 VAC. The lower gain plot was taken with a 300 V output. The upper gain plot was taken with a 250 V output.

    The image above shows the drain-to-source voltage on Q3. The input was set to 250.

    Line Voltage and Current Waveform

    The image above shows the input voltage and current. The input voltage was 230 VAC.

    Diode Voltage Waveform

    Inductor Winding Currents

    The image above shows the voltage on the anode of D1. The input was set to 250 VDC.

    The two images above show the currents in the individual windings of the inductor.

  • LED Reference Design Cookbook TexasInstruments2Q2010

    25-Watt Dimmable Driver with PFC

    UCC28810/UCC28810EVM-001

    24

    Description TheUCC28810EVM-001evaluationmodule(EVM)isa25-WTRIACdimmableandsingle-stageflybackconverterwithPFC.TheUCC28810EVM-001providesapproximately36Vataconstant700-mA(undimmednominal)loadcurrenttopowerastringofhigh-brightnessLEDs.ThisEVMallowstheevaluationoftheUCC28810LEDlightingcontrollerinanapplicationwhereLEDscanbeusedforgeneralilluminationapplicationsthatrequiredimming.

    resistanceisusedacrossthelineorinseriesthatwouldreduceefficiency.ValleyswitchingisimplementedintheUCC28810EVM-001toimproveefficiency.Afaststart-upcircuitisalsoimplemented,sothereisnoperceiveddelayfromswitchingtoillumination.

    Web LinksReference designs:www.ti.com/powerreferencedesigns

    Datasheets, users guides, samples:www.ti.com/sc/device/UCC28810

    EVM:www.ti.com/ucc28810evm-001

    UCC28810EVM-001 Block Diagram

    Design Specifications

    Description Parts

    VIN (AC) Range

    VOUT (DC) Range

    Number of LEDs

    IOUT (max)

    POUT (max) Eff. PFC ISO

    Dimming In

    Dimming Out EVM

    UCC28810 EVM001 25-W

    UCC28810 85

    33 10 700 mA 25 W 89% Yes Yes TRIAC Linear YesPFC dimmable LED driver TPS3808 305

    UsingtheUCC28810transition-modeboostICwithPFCinaflybackconverteryieldsavalley-switchingdesignthatcanachieve90%efficiencyandahighpowerfactoroverauniversalwideinput-voltagerange.TheUCC28810EVM-001alsooperatesoverauniversalwideinput-voltagerange.High-performanceTRIACdimmingdetectionandregulationadjustmentareachievedwithminimalimpactonefficiency.

    Aninput-filterdampingnetworkensuresoperationswithmostTRIAC-basedwalldimmers.Noextra

    VSENSE

    UCC28810

    EAOUT

    VINS

    ISENSE

    1

    2

    3

    4

    8

    7

    6

    5

    VDD

    Dimmer

    GDRV

    GND

    TZE

    Input Filter and Bridge

    High Voltage Startup

    ZeroEnergyDetect

    PrimaryBias

    SecondaryBias

    CurrentEA

    Voltage LimitEA

    Triac Dimming Detection

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    25-Watt Dimmable Driver with PFC

    UCC28810/UCC28810EVM-001

    25

    25-Watt Dimmable Driver with PFC

    UCC28810/UCC28810EVM-001Efficiency vs. Line Voltage

    Load current as a function of line voltage. 10 Cree XLamp 7090 XR-E, white, 700 mA LEDs connected in series was used for the load.

    Triac Dimming Detection Circuit Waveforms Deep Dimming

    Power Factor vs. Line Voltage

    Total Harmonic Distortion vs. Line Voltage Triac Dimming Detection Circuit Waveforms Light Dimming

    Output Current vs. Line Voltage

    Efficiency as a function of line voltage. 10 Cree XLamp 7090 XR-E, white, 700 mA LEDs connected in series was used for the load.

    Power factor as a function of line voltage.10 Cree XLamp 7090 XR-E, white, 700 mA LEDs connected in series was used for the load.

    Total harmonic distortion as a function of line voltage. 10 Cree XLamp 7090 XR-E, white, 700 mA LEDs connected in series was used for the load.

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Nonsynchronous Boost LED Driver

    TPS40211 PMP4026

    26

    Description TheTPS40211isawide-input-voltage(4.5-to52-V),nonsynchronousboostcontroller.Itissuitablefortopologiesthatrequireagroundedsourcen-channelFETsuchasboost,flyback,SEPICandvariousLED-driverapplications.TheTPS40211featuresaprogrammablesoftstart,overcurrentprotectionwithautomaticretry,andaprogrammableoscillatorfrequency.Current-modecontrolprovidesimprovedtransientresponseandsimplifiedloopcompensation.Thefeedbackpinhasareferencevoltageof260mVtohelpreducethepowerusageandcostofthesenseresistor.

    ThePMP4026circuitshownbelowwasdesignedwithanautomotiveinput-voltagerange.Thedriverwasbuilttooperateunderlow-powertonominalbatteryconditionsandtosurviveload-dumpincidents.TheTPS40211waschosenforthisapplicationduetoitslowfeedbackvoltageandwide

    Key Features Wide4.5-to52-Vinputrange Low-costnon-synchronousboost Highefficiencyfromlow260-mV

    VREF Simpleloopcompensation SupportsversatileSEPICtopology

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS40211

    PMP4026 Schematic

    TPS40211DGS

    48V @ 0.7AGND

    VDDVBP

    GDRVISNSGND

    RCSSSDCOMPFB

    109876

    Freq = 150 KHZ

    12345

    C71

    D100(R6)3.3V

    VBP

    R549.9K

    R110.01C9

    100pF

    R101.21K

    Q1Si4858

    R215K

    C1470pF

    R3249K

    R1249K

    R10010K

    C44700pF

    C83.3F

    3 2 1

    4G

    S

    D8 7 6 5

    1 2

    R4A2

    D247V

    R949.9

    C12B3.3F50V

    C12A3.3F50V

    D1MBRS260

    1

    2

    3

    Q1002N7002DICT

    9 - 18 VINGND

    C50.1

    33 H

    ENAB

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 9 16 VDC

    Output voltage 40 Volts

    Output current 0.700 Amp

    Switching frequency 150 kHz

    input-voltagerange.Theapplication,powereddirectlyfromVBAT,canhaveastringofuptoten700-mALEDsinseriesortwoparallelstringswithuptoten350-mALEDsineachstring.

    Anadditionalreferencedesignisavailable.Thisdesignisa700-mA,nonsynchronousboostcurrentregulatorforanLEDdriver.Ithasan8-to18-Vinputanda20-to35-Voutput.Itcanbefoundalongwithademonstrationboardat:

    http://focus.ti.com/docs/toolsw/folders/print/tps40211evm-352.html

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Nonsynchronous Boost LED Driver

    TPS40211 PMP4026

    27

    Nonsynchronous Boost LED Driver

    TPS40211 PMP4026Startup

    Efficiency Control Loop Frequency Response: 12 V input; 1.15 A Load

    Load Regulation of Outputs Load Transients

    Output Ripple Current

    The input voltage was set at 12 V, with 0.15 (LED) + 1 (resistor) A load on the outputs. The image was taken with a 1.15 A/20 V load. Top waveform is FET drain, bottom is LED current.

    Total output current was 1.15 A, output voltage was 20 volts.

    Output response to driving TP%. The input voltage was set to 12 V.

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Wide-Input DC Voltage Range SEPIC Driver

    TPS40211 PMP3943

    28

    Description TheTPS40211isawide-input-voltage(4.5-to52-V)nonsynchronousboostcontroller.Itissuitablefortopologiesthatrequireagroundedsourcen-channelFETsuchasboost,flyback,SEPICandvariousLED-driverapplications.TheTPS40211featuresaprogrammablesoftstart;overcurrentprotectionwithautomaticretry;andaprogrammableoscillatorfrequency.Current-modecontrolprovidesimprovedtransientresponseandsimplifiedloopcompensation.Thefeedbackpinhasareferencevoltageof260mVtohelpreducethepowerusageandcostofthesenseresistor.

    ThePMP3943circuitshownbelowwasdesignedwithanautomotiveinput-voltagerange.Thedriverwasbuilttooperateunderlow-powerbatteryconditionsandtosurvive

    PMP3943 Schematic

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 8 40 Volts

    Output voltage 13 Volts

    Output current 0.350 Amp

    Switching frequency 300 kHz

    U1TPS40211DGS

    J1VIN

    GND8-40

    Short L4L40

    13V @ 350mATested with LEDsGiving 12.3 V

    LEDA

    LEDC

    LEDC

    D18180-13C15

    3.3F

    VDDVBP

    GDRVISNSGND

    RCSSSDCOMPFB

    109876

    Freq = 380 KHZ

    3 2 1

    4

    8 7 6 5

    3 4

    1 2

    12345

    03

    L2100H

    R101k

    R949.9

    R549.9

    R710

    C71F

    R60

    R140.75

    C1310F

    R110.10

    D218V

    R10010K

    R20

    R1249K

    C44700pF

    C83.3F

    C50.1F

    C1220pF

    C347pF

    C20.22F C9

    0.1F

    1

    2

    load-dumpincidents.TheTPS40211waschosenforthisapplicationduetoitslowfeedbackvoltageandwideinput-voltagerange.

    Anadditionalreferencedesignisavailable.Thisdesignisa700-mA,nonsynchronousboostcurrentregulatorforanLEDdriver.Ithasan8-to18-Vinputanda20-to35-Voutput.Itcanbefoundalongwithademonstrationboardat:

    www.ti.com/sc/device/TPS40211evm

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    Key Features Wide4.5-to52-Vinputrange Low-costnon-synchronousboost Highefficiencyfromlow260-mV

    VREF Simpleloopcompensation SupportsversatileSEPICtopology

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS40211

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Wide-Input DC Voltage Range SEPIC Driver

    TPS40211 PMP3943

    29

    Wide-Input DC Voltage Range SEPIC Driver

    TPS40211 PMP3943

    3 Green and 1 Red OSRAM LEDs Used as Load for Vf About 12 V

    VIN Volts IIN mA VOUT1 Volts IOUT1 mA Efficiency %

    40.22 123.6 12.27 341.8 84.4

    20.11 238.5 12.27 341.3 87.3

    7.93 619.4 12.27 341.3 85.3

    Regulation and efficiency: 25 degrres Celsius ambient. Target IOUT was 350mA, hence actual current is 2.5% low.

    When Diode Load is Opened, VOUT Goes to About 18 V

    VIN Volts IIN mA VOUT1 Volts IOUT1 mA

    40.42 8.79 18.44 0

    20.08 10.75 18.41 0

    8.00 19.12 18.40 0

    Short Circuit: Output Current Holds Steady

    VIN Volts IIN mA VOUT1 Volts IOUT1 mA

    40.14 21.24 0.694 341.6

    20.06 34.20 0.694 341.5

    8.00 77.70 0.694 341.4

    Current Loop Frequency Response

  • LED Reference Design Cookbook TexasInstruments2Q2010

    TMS320C2000 PLC Modem Evaluation Kit

    TMDSPLCKIT-V1

    TMS320C2000 PLC Modem Evaluation Kit

    TMDSPLCKIT-V1

    30

    Description Power-linecommunication(PLC)isaninexpensivewaytoaddlightingcontroltoexistingornewbuildingsandinfrastructureswithoutlayingdownnewcontrolcabling.TheTMDSPLCKIT-V1isaPLCevaluationkitbasedontheC2000seriesofreal-timemicrocontrollers.ItoperatesinbothOFDMandS-FSKmodulationschemesandhasdataratesofupto76.8kbps.

    Thekitcomeswithaneasy-to-useGUIthatmakestestingthecommunicationslinkintuitiveandsimple.

    Web Linkswww.ti.com/plcevm

    Datasheets, users guides, samples:www.ti.com/sc/device/OPA564 orwww.ti.com/sc/device/PGA112

    TMDSPLCKIT-V1 Block Diagram

    Specifications OFDMandS-FSKmodulationschemes

    Dataratesofupto76.8kbpsforonephase(phaseselectionisprovided)

    PLCsystemonmodule(SoM)withinterfacetohostcontroller(I2C,SPI,SCI)

    CompatiblewithCENELECEN50065andIEC6100-3standards

    Operatingfrequencyrange:24to94.5kHz(CENELECAband.Bbandtoreleasein1Q10.)

    UniversalAC-voltageinput(85to270VAC)

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    PWM Out

    Line Driver

    OPA564

    PGA112

    Receive Filter

    Surge Protector

    Power Line

    CouplingTransformerHV Cap

    PLC Modem Implementation on TMS320F28x 32-Bit MCU - Simplified Block Diagram

    12-BitADC

    FlexiblePLCSW

    Engine

    TMS320F28x

    NEW!

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    TMS320C2000 PLC Modem Evaluation Kit

    TMDSPLCKIT-V1

    31

    TMS320C2000 PLC Modem Evaluation Kit

    TMDSPLCKIT-V1PLC Data Signal

    50- or 60-Hz Power Line

    PLC Signal Modulated Onto the Power Line 50/60Hz

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Digital Addressable Lighting Interface (DALI)

    DALI Implementation with the MSP430 MCU

    32

    Description Intelligentlightingcontrolcanprovidelargeefficiencygainsandenergysavings.Thedigitaladdressablelightinginterface(DALI)standardisbecomingincreasinglypopularforthisapplication.

    TheDALIevaluationkitenablesthedesignertorunDALIonthepopularMSP430seriesofmicrocontrollers.SoftwarelibrariesandhardwarereferencefilesareprovidedtoallowquickevaluationanddevelopmentwiththeDALIstandard.

    Web LinksApplication Note:www.ti.com/lit/SLAA422

    MSP430-Based DALI Reference Design

    Specifications Fullhardwarereferencefiles,

    includingschematics,GerberfilesandBOM

    Fullsoftwarelibraries SupportfortheentireDALI

    commandset,includingbidirectionalcommands

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    DALI+

    DALI

    GND

    1

    2

    4

    3

    MSP430MCU

    GND

    1

    2

    4

    3

    NEW!

  • TexasInstruments2Q2010 LED Cookbook

    33

    DC/DC LED Developers Kit

    TMDSDCDCLEDKIT

    Digital Addressable Lighting Interface (DALI)

    DALI Implementation with the MSP430 MCUDescription TheDC/DCLEDDevelopersKitincludesallofthehardwareandsoftwaretostartexperimentingwithanddevelopingadigitallycontrolledLEDbacklightingsystem.ThekitisbasedonthePiccolomicrocontrollerandthecontrolCARDdevelopmentplatform.OnePiccoloMCUisabletodirectlycontroltheDC/DCpowerstageaswellaseightLEDstrings.Thedevelopmentboardtakes12to48VDCofinputandusesaSEPICDC/DCtopologytobuckorboosttheinputvoltagetoadesiredlevel.ThisvoltageisthenfedtofourLED-drivingstages,eachcapableofdrivingtwoLEDstringsatupto30Weach.Thekitincludesclosed-loop,open-sourcesoftwareforboththeDC/DCstageandtheLED-lightingstage.Thekithardwareisalsocompletelyopen-source,withtheGerberfiles,

    Web LinksDatasheets, users guides, samples:www.ti.com/c2000tools

    Typical Application Schematic

    schematicsandBOMsallavailableforfree.Formoreinformation,pleaseseethequick-startguideforthekit.TodownloadtheLEDsoftware,pleasevisit:www.ti.com/c2000tools

    Key Features 12-to24-VDCinputtoSEPICDC/DCstage,12-to40-VDCoutput

    FourLED-driverstages,eachcapableofdrivingtwostringsat30W

    LED-driverstagescanbeexternallypowered

    Piccolo-basedcontrolCARDdevelopmentplatform

    Open-sourcehardware,includingGerberfiles,schematicsandBOMs

    Closed-loopDC/DCandLED-drivingsoftware,completewithsourcecodeanddocumentation

    DC12 V to 48 V

    Sepic

    Piccolo

    CPU32 bit

    PWM-1A

    B 2

    1

    2

    PWM-1A

    B

    3

    4

    PWM-1A

    B

    5

    6

    PWM-1

    I2CSPIUART

    A

    B

    7

    8

    3

    1

    3

    2

    3

    4

    8

    9

    1

    +

    +

    2

    3

    13

    ADC12 bit

    VREF

    33

    NEW!

  • LED Reference Design Cookbook TexasInstruments2Q2010

    34

    Description TheTPS61165operatesovera3-to18-Vinputsupplyanddeliversanoutputvoltageupto38V.Withits40-VratedintegratedswitchFET,thedevicedrivesupto10LEDsinseries.Itoperatesata1.2-MHzfixedswitchingfrequencytoreduceoutputripple,improveconversionefficiency,andallowfortheuseofsmallexternalcomponents.Thedefaultwhite-LED(WLED)currentissetwiththeexternalsensorresistorRSET,andthefeedbackvoltageisregulatedto200mV.IneitherdigitalorPWMdimming,theoutputrippleofTPS61165attheoutputcapacitorissmallanddoesnotgenerateaudiblenoisesassociatedwithcommonon/offcontroldimming.Forprotectionduringopen-LEDconditions,theTPS61165disablesswitchingtopreventtheoutputfromexceedingtheabsolutemaximumratings.

    ThePMP3598usestheTPS61165inanonsynchronousboostconfiguration.Anadditionalcircuitbuiltaroundtheopampprovidesthebatteryunder-voltage/chargingindicationsandalsoprovidesORingbetweenthesolarpanelandbatteryinputs.Thecircuitalso

    PMP3598 Schematic

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input Voltage 4.5 6 7.4 Volts

    Output Voltage 10.45 10.5 10.65 Volts

    Output Ripple 50 mV pp

    Output Current 0 350 mA

    Switching Frequency 1200 kHz

    J1 D1BAT54C

    D3BAT54C

    R11K

    D5MBRS120

    R181

    R161

    R6169K

    R11226K

    R9169K

    R34.42K

    R42.25M

    R210K

    R54.42K

    U1:BTL103WID

    U2

    TPS61165D

    RV

    D6BZX84C18T

    R1310K

    R8Open

    D4IN5820

    R121K

    R2151.1

    C22.2F

    C30.22F

    C43.3F

    R1459K

    R15100K

    R10162K

    R176.81K

    RT122K

    R7100K

    C10.1F

    Q1Si2343DS

    TP1

    TP2

    TP5

    12

    23

    65

    1 2 3

    6 5 4

    7

    1 2 3 4 5 6 7 8

    J41

    2

    J31

    2

    L110H

    TP3

    TP4 To 28K POT

    LED ALED C

    R202.61K

    4

    5

    7

    FB COMP

    GND

    VIN

    CTRL

    SW

    PwPd

    incorporatesthenecessarythermalandovercurrentprotectionsandhasload-disconnectfeature.

    KeyconsiderationsforthisdesignarehighefficiencyandgoodLED-currentregulation.TheTPS61165operatesinaconstant-currentmodetoregulatetheLEDcurrent.TheCTRLpinisusedforthecontrolinputforbothdigitalandPWMdimming.ThedimmingmodefortheTPS61165isselectedeachtimethedeviceisenabled.Analogdimminghasbeenimplementedbyvaryingthefeedbackreference.A20-kWvariableresistorcanbeusedtovarytheLEDcurrenttoachievedimming.Theconverterboosts6to10.5Vat350mAandhasminimumconversionefficiencyof85%.Thiscircuitis

    usedfordrivingthree1-WLEDsormultiple50-mALEDswhostotalpowerinputdoesnotexceed3W.

    Key Features Boostoutputupto38Vout Widesupplyvoltage3Vto18V Highefficiencyfrom200-mV threshold PWMdimming LEDopenprotection 350-mALEDcurrent

    Web LinksReference designs:www.ti.com/powerreferencedesigns

    Datasheets, users guides, samples:www.ti.com/sc/device/TPS61165

    3-Watt Solar Lantern

    TPS61165 PMP3598

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    3-Watt Solar Lantern

    TPS61165 PMP3598

    35

    Switching Waveform

    Open LED Protection

    Efficiency

    Output Ripple

  • LED Reference Design Cookbook TexasInstruments2Q2010

    High-Brightness LED Driver with Switch Control

    TL4242

    High-Brightness LED Driver with Switch Control

    TL4242

    36

    Description High-brightnessLEDsarebecomingmoreandmoreprevalentinallfacetsoflife.Lineardriversaregreatforsimpleapplicationsthatdonotrequireveryhighefficiencyandforapplicationsthatmusthavelittleornoelectromagneticinterference(EMI).Pulse-widthmodulation(PWM)isusedfordimminginsomeoftheseapplicationsbutcanalsointroduceEMI.ThisreferencedesignusesasimplelinearLEDdriverforhigh-brightnessapplicationsanddemonstratesoneofseveralmethodsofcontrollingdimmingwithouttheintroductionofEMI.

    TheTL4242isalinearconstant-currentsingle-channelLEDdrivercapableofsourcingupto500mA.TheTL4242iscapableofrunningfromasupplyofupto42VsothatalargeLEDstringcanbedriventhroughasingledevice.Figure1showsasimpleexampleoftheTL4242usedtodrivefourLEDs(typicalVF=3.5V).Inthisdesign,thePWMpinisusedonlytoenableanddisabletheTL4242.Thecurrentissetthroughaverysimplerelationshipbetweenthesenseresistor(RREF)andthevoltageattheREFpin(VREF):

    IOUT=VREF/RREF

    TheTL4242stypicalVREFis0.177V.IfRREFissetto2W,thenthecorrespondingIOUTwillbe88.5mA.

    IntheapplicationinFigure1,the18-VsupplycurrentisfeddirectlyintotheTL4242forLEDcurrent.TheTL4242alsomonitorstheLEDstringforanopenconditionandsetsthestatus(ST)pinifanopenisdetected.

    ToenabledimmingwithoutPWM,RREFmustbechangedandiseasilymanipulatedwithasimpleanalogswitch.TheTS3A4742ischosen(seeFigure2)becauseofitslow(typically0.7-W)RON,high-current(100-mA)capability,dual-switchconfiguration

    350mA.ChangingRREFP,RREFS1andRREFS2providesawidevarietyofdimminglevels.RREFS1andRREFS2mustbechosenwiththeRONoftheswitchinmind.Notethateachleghasthesamecurrentwhenitison,regardlessoftheotherlegscurrent.

    Figure 1. Simple TL4242 LED Drive Circuit

    Figure 2. TS3A4742 Dual, Normally Closed Analog Switch Provides Four Brightness Levels

    andnormallyclosedoperation.Caremustbetakentokeepthechannelcurrentunder100mA.

    Figure2demonstratestheTL4242usedwiththeTS3A4742toproduceanLEDdimmingcircuitcapableofswitchingbetween200,250,300and

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    RREF

    C147nF

    +18V

    10K

    TL4242 Q

    REF

    I

    TPS7A4533

    IN SHDN

    GND SENSEOUTSTPWM

    GND D

    Controller

    RREFP

    C147nF

    RREFS1RREFS2NC1

    +3.3V

    IN1

    NC2IN2

    COM2

    COM1

    +18V

    10K

    3.3V

    V+

    GND

    TS3A4742

    TL4242 Q

    REF

    I

    TPS7A4533

    IN SHDN

    GND SENSEOUTSTPWM

    GND D

    Controller

    Switched Reference Resistors

    Primary ReferenceResitor (RREFP) (RREFS1) (RREFS2)

    Equivalent Resistance (RREF)

    Nominal Output Current (IOUT)

    0.885 W 1.77 W 3.54 W 0.506 W 350 mA

    0.885 W 1.77 W Open 0.590 W 300 mA

    0.885 W Open 3.54 W 0.708 W 250 mA

    0.885 W Open Open 0.885 W 200 mA

    Note: RREFS1 and RREFS2 include RON of the TS3A4742.

    NEW!

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    High-Brightness LED Driver with Switch Control

    TL4242

    37

    High-Brightness LED Driver with Switch Control

    TL4242

    Figure 4. Switches in Series

    Figure 3. Analog-Switch Brightness Control

    Simple Pushbutton 1

    RREFP RREFS1

    NC1

    +3.3V

    IN1

    NC2IN2

    COM2

    COM1

    +3.3V

    +18V

    10K

    Simple Pushbutton 2

    V+

    GND

    TS3A4742

    TL4242 Q

    REF

    I

    TPS7A4533

    IN SHDN

    GND SENSEOUTSTPWM

    GND D

    RREFP

    C147nF

    RREFS

    NC1

    +3.3V

    IN1

    NC2IN2

    COM2

    COM1

    +18V

    10KV+

    GND

    TS3A4742

    TL4242 Q

    REF

    I

    TPS7A4533

    IN SHDN

    GND SENSEOUTSTPWM

    GND D

    Controller

    ChoosingadualswitchwithalowRONallowstheusertoconnectbothchannelsinparallel,therebyreducingtheeffectiveRON.ThisparallelapproachcanreducetheTS3A4742stypicalRONto0.35W.Figure3showsanexampleusingthisparallelapproachtogenerateadual-brightnessdesign.Thisapplicationusesa0.65-Wresistor(RREFS1)inserieswithbothswitches,creatinganeffectiveRREFof1-W.Thislegwillsink177mA(88.5mAthrougheachswitch)whenon.Caremustbetakentokeepthecurrentthroughtheanalogswitchbelowthemaximumallowed.Additionally,thepowerdissipationintheswitchpackagemustbeconsidered.InthecaseoftheTS3A4742,themaximumcontinuouscurrentis100mAperchannel.Figure3alsoremovesthecontrollerandreplacesitwithsimplepush-buttonswitches.Thisdesignallowsasinglebutton(orothermanualcontrol)toenabletheLEDs(simplepush-button1)andanothertosetthebrightnesslevel(simplepush-button

    2).Thisisasimpleautomotivetail-lightsolutionforon/offandbraking.ThetaillightisonwhenPWMishigh(push-button1isnotdepressed).Thebrightnessofthetaillightisnormalwhenpush-button2isnotdepressedandbrighterwhenitisdepressed.

    Anotheroptionistohookuptheswitchesinaserialmanner(seeFigure4),therebydoublingthe

    resistanceto1.4W.Thisalsopermitsdualbrightness;butthecurrentthroughtheTS3A4742islimitedto100mAperchannel,sothebrightnesswillbelowerthanwhenthechannelsareinparallel.

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TL4242

    Primary Reference Resistor

    (RREFP)

    SwitchedReference Resistors(RREFS1 + RREFSwitch)

    Equivalent Resistance (RREF)

    Nominal Output Current

    (IOUT)

    1 W 1 W + 1.4 W = 2.4 W 1.09 W 162 mA

    1 W Switch Open 2 W 88.5 mA

    .

  • LED Reference Design Cookbook TexasInstruments2Q2010

    High-Brightness LED Driver with Single-Clock Operation

    TLC5917

    High-Brightness LED Driver with Single-Clock Operation

    TLC5917

    38

    Description TheTLC5917isan8-channel,constant-currentLEDdrivercapableofupto120mAperchannel.ThisisagreatfitwhenanapplicationrequiresaconstantLEDcurrentthatisindependentofinputvoltage,temperatureanddifferencesinLEDforward-voltagedropsresultingfromuncontrolledmanufacturingprocesses.Theoutputscanalsobetiedinparallelwhenneededtodrivehigh-brightnessLEDs.Communicationisaccomplishedthroughabasicserialport.Manyapplicationsdonothavethecapabilityforgeneratingevensimpleserialcommands.Thisreferencedesignallowsausertoovercomethisissuewithasimple555timer.

    TheTLC5917driveseightindependentconstant-currentsinks.Normally,amicroprocessordrivesthe/OE(outputenable),SDI(serialdatainput),CLK(clock)andLE(latch)pinswithfourseparateGPIOpins,whichallowsthecurrentsinktobeindependentlyturnedonandoff.IfindependentLEDcontrolisnotneeded,theTLC5917canbeturnedonwithasingleclocksignalora555timer. /OE(outputenable)Thispinenablesanddisablesalloutputs.

    SDI(serialdatainput)Thedataclockedintothispinprogramseachoutputtobeonoroff.

    Figure 1. TLC5917 Driven by 555 Timer

    LEDson.PullingSDIlowturnsallLEDsoffaftereightclockcycles.Figure2showshowtheTLC5917respondstoturn-onandturn-offwhenitisconfiguredasshowninFigure1.NotethatFigure1showsalltheTLC5917outputsconnectedinparalleltodriveasinglehigh-brightnessLED.TheTLC5917outputscaneitherdriveeightindependentLEDsorbeconnectedinparalleltodrivehigher-powerLEDs.InFigure1,R3=178W,whichsetseachoutputcurrentat105.3mA.Connectingalloutputsinparallelyields105.3mAx8=842.4mAofLEDcurrent.

    Thissameapproachcanbeusedforanyofthe8-and16-channelTLC59xxfamilies,includingtheTLC5916/25/26/27andTLC59025.

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TLC5917

    CLK(clock)TherisingedgeoftheclockshiftsSDIdataintointernalshiftregisters.

    LE(latch)ThefallingedgeofLElatchesdatafromtheinternalshiftregistersintotheinternalon/offlatches.

    CloseexaminationoftheTLC5917timingdiagramrevealsthatasinglePWMsignalcanreplacetheCLKandLEinputsbecausetherisingedgeofCLKshiftsdataintotheICandthefallingedgeofLElatchesthedata.Figure1showshowtoconfiguretheTLC5917tooperatefromasingleclocksignal.

    /OEmustbeconnectedtogroundtoenabletheIC.TheSDIpincanbeconnectedtoVCCtoshift1sintotheICtoturnalloutputson,andcanbeconnectedtogroundtoshiftall0sintotheICtoturnalloutputsoff.TheCLKandLEpinscanbeconnectedtoanytypeofPWMsignal.Turn-onandturn-offtimeswiththiscircuitdependontheclockfrequency.Atpowerup,theTLC5917sinternalon/offlatchesthatturneachoutputonoroffdefaultto0,sotheselatchesmustbesetto1beforetheoutputsturnon.Eachrisingandfallingedgeoftheclocksignalsequentiallyturnsoneachoutput,startingwithOUT0.Therefore,ittakeseightclockcyclestoturnall

    U2TLC5917PW

    ON/OFF Control

    ON/OFF

    R3178

    C30.1

    C40.110kHz Clock

    C20.1

    C11500p

    R220.0k

    R137.4k

    Outputs connected in parallel for 842mALED current

    High PowerLED

    OUT0

    OUT1

    OUT2

    OUT3

    OUT4

    OUT5

    OUT6

    OUT7

    VDD

    CLK

    LE(ED1)

    (ED2)OE

    SDI

    SDO

    R-EXT

    GND

    U1TLC555D

    VCC

    RESET

    DISCH

    THRES

    TRIG

    GND

    OUT

    CONT

    16

    3

    4

    13

    2

    14

    15

    1

    8

    4

    7

    6

    2

    1

    3

    5

    5

    6

    7

    8

    9

    10

    11

    12

    VCCVCC

    NEW!

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    High-Brightness LED Driver with Single-Clock Operation

    TLC5917

    39

    Figure 2. LEDs Turn-On and Turn-Off Responses with 10-kHz Clock

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Wireless-Controlled Triple LED Driver

    TPS62260 TPS62260LED

    40

    Description Residentialandcommerciallightingcantakeadvantageoftheadditivecolormixingofred,greenandblueLEDs.ThisreferencedesigndemonstrateshowtoremotelymanagethecoloroutputofanLEDlampwithalow-powerwirelesscontroller.ThecolorisgeneratedbythreeLEDs(red,greenandblue).AnMSP430ultralow-powermicrocontrollercontrolsthebrightnessofeachLEDwithconstantcurrentgeneratedbythreeTPS62260buckconverters,oneforeachLED.

    Thecolorlook-uptabletakestheformofanarraystoredintheMSP430.Whenevertherotaryencoderisturned,newred,greenandbluevaluesarereadfromthearrayandusedtogeneratethethreePWMoutputsignals.Currently252valuesarestored,whichcanbechangedifdesired.Adecimalvalueof100switchestheLEDoff,andavalueof65535producesamark-spaceratioof100%.Whenthe5-Vsupplyisapplied,

    MSP-FET430UIFtoolscanbefoundrespectivelyat:

    http://focus.ti.com/docs/toolsw/folders/print/ez430-rf2500.html andhttp://focus.ti.com/docs/toolsw/folders/print/msp-fet430uif.html

    Key Features WirelessRGBcolormixing Ultra-low-powerMSP430controller Wirelessdevelopmenttoolavailable

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS62260

    EVM:www.ti.com/tps62260led-338

    TPS62260LED-338 Schematic

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 4.5 5 5.5 VDC

    Output current 0.300 Amp

    U1MSP430F2131RGE

    NCVSSXOUT/P2.7/CA7XIN/P2.6/CA6NM /RSTP2.0/ACLK/CA2P2.1/INCLK/CA3P2.2/CAOUT/TA0/C44P1.4/SMCLK/TCKNCP2.3/TA1/CA0P2.4/TA2.CA1NC PwPd

    P2.5/CA5VCCTEST

    P1.7/TA2/TDO/TDIP1.6/TA1/TDI/TCLK

    NCP1.5/TA0/TMS

    P1.3/TA2P1.3/TA1P1.1/TA0

    P1.0/TACLK

    123456789101112

    2468101214

    654321

    135791113

    JP1

    NET-DIMM_LED1NET-DIMM_LED2NET-DIMM_LED3NET-EN

    242322212019181716151413

    3.3V

    3.3V

    3.3V

    R6100K

    R3100K

    R4100K

    C310n

    S1

    R547K

    C2100n

    3.3V

    JP2

    eZ430=RF Connector

    thedesigngoesintoademonstrationmodewherethevaluesstoredinthearrayarereadandoutputinsequenceinaninfiniteloop.Assoonastherotaryencoderisturned,thesequencestopsandaparticularfixedcolorvaluecanbeselected.

    ThereisapinheaderthatcanbeusedtoplugintheRFboardfromtheMSP430WirelessDevelopmentTool(theeZ430-RF2500),whichisseparatelyavailable.Withthisadditionalmodule,thelampscolorscanbecontrolledremotelyviathewirelessRFinterface.

    IfadesignerpreferstoreprogramtheMSP430,aseparateMSP430flashemulationtoolcanbeordered,suchastheMSP-FET430UIF.MoreinformationontheeZ430-RF2500and

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Wireless-Controlled Triple LED Driver

    TPS62260 TPS62260LED

    41

    Wireless-Controlled Triple LED Driver

    TPS62260 TPS62260LEDRed LED

    Green LED

    Blue LED

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 4.5 5 5.5 VDC

    Output current 0.300 Amp

    U11TPS62260DRV

    red

    C1222F

    R122

    R1110K

    R1310K

    D14

    D13

    TS4148RY

    C114.7F

    1

    C134.7F ???mV

    TP11

    GNDVINEN

    SWMODE

    FBPwPd

    654

    123

    7

    TP12

    TP13

    VIN

    L11

    NET-DIMM_LED1

    +5V

    NET-EN

    U21TPS62260DRV

    green

    C2222F

    R222

    R2110K

    R2310K

    D24

    D23

    TS4148RY

    C214.7F

    1

    C234.7F ???mV

    TP21

    GNDVINEN

    SWMODE

    FBPwPd

    654

    123

    7

    TP22

    TP23

    VIN

    L21

    NET-DIMM_LED2

    +5V

    NET-EN

    C14.7F

    D1BZX84-C3V3

    C422F

    R2330

    VINmax < 6V

    +5VJ1123

    3.3V

    U31TPS62260DRV

    blue

    C3222F

    R322

    R3110K

    R3310K

    D34

    D33

    TS4148RY

    C314.7F

    1

    C334.7F ???mV

    TP31

    GNDVINEN

    SWMODE

    FBPwPd

    654

    123

    7

    TP32

    TP33

    VIN

    L31

    NET-DIMM_LED3

    +5V

    NET-EN

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Low-Voltage Buck Boost for LED Torch

    TPS63000 PMP3038

    42

    Description TheTPS63000providesapower-supplysolutionforproductsthatuseatwo-orthree-cellalkaline,NiCdorNiMHbattery,oraone-cellLi-IonorLi-Polymerbattery.Thebuck-boostconverterisbasedonafixed-frequencyPWMcontrollerthatusessynchronousrectificationtoobtainmaximumefficiency.Themaximumaveragecurrentintheswitchesislimitedtoatypicalvalueof1800mA,andtheconvertercanbedisabledtominimizebatterydrain.Duringshutdown,theloadisdisconnectedfromthebattery.Thedeviceispackagedina10-pinQFNPowerPAD(DRC)packagemeasuring3x3-mm.ThePMP3038circuitwasdesignedforatorchorruggedflashlight.Mosttorchapplicationsstillusealkalinebatterieswithacommonconfiguration

    Key Features Buck-boostconvertertopology Idealforbatteryapplications 1.8-Aoutputcapability Autobuck-boostmodeswitching DualLEDbrightnesslevels Operatesdownto1.2V

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS63000

    PMP3038 Schematic

    Design Specifications

    Parameter Minimum Maximum Unit

    Input voltage 1.2 5 VDC

    Output voltage 5 Volts

    Output current 300 600 mAmp

    Switch frequency 1.5 MHz

    +

    U1TPS63000DRC

    S1

    NO

    1.5V x 2BAT

    C310F

    C41000pF

    C122F

    C222F

    D17090 XR-E

    THERMALPADC6DNP

    R249.9K

    R512.7K

    R30.3

    R40.3

    R649.9

    S2NC

    NOD2LM4040D2.048V

    R110K

    NCL2

    VOUT

    PGND

    FB

    GND

    4

    5

    8

    7

    6

    2

    1

    3

    10

    9

    11

    L1

    VIN

    VINA

    SYNC/PS

    EN1PwPd

    L12.2H

    oftwoorthreecellsinseriesthathaveamaximumvoltageof5V.Duringoperation,theVBATdropsbelowtheVfoftheLED,andtheTPS63000automaticallyswitchesfrombuckmodetoboostmodetocreatetheconstantcurrentneededfortheLED.TheTPS63000canboostfromvoltagesaslowas1.2V.AswitchthatbringsR4intooroutofthefeedbackloopprovidesadimmingmechanismfortheflashlighttotogglebetween300and600mA.

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Low-Voltage Buck Boost for LED Torch

    TPS63000 PMP3038

    43

    Low-Voltage Buck Boost for LED Torch

    TPS63000 PMP3038Output Current Graphs with DC Coupling

    Efficiency Curve for IO = 0.32 A and IO = 0.62 A Turn On with 0.63 A

    Control Loop Response Graphs

    Output current with VIN = 3 V.

    Control loop response with 0.63 A.

    Output current with VIN = 4 V.

    Control loop response with 0.32 A.

    Efficiency.

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Boost Driver with Integrated Power Switch

    TPS61500

    44

    Description TheTPS61500isamonolithicswitchingregulatorwithanintegrated3-A,40-Vpowerswitch.Itisanidealdriverforhigh-brightness1-or3-WLEDs.Thedevicehasawideinput-voltagerangetosupportapplicationswithinputvoltagefrommulticellbatteriesorregulated5-Vto12-Vpowerrails.

    TheLEDcurrentissetwithanexternalsenseresistor,R3,andwithfeedbackvoltagethatisregulatedto200mVbyacurrent-modePWMcontrolloop,asshownintheschematicbelow.ThedevicesupportsanalogandpurePWMdimmingmethodsforLEDbrightnesscontrol.ConnectingacapacitortotheDIMCpinconfiguresthedevicetobeusedforanalogdimming,andtheLEDcurrentvariesinproportiontothedutycycleofanexternalPWMsignal.FloatingtheDIMCpinconfiguresthe

    Key Features Supportsboosttopology Integrated3-A40-Vpowerswitch SupportsPWMorAMdimming Protectionfeatures: Pulsebypulse Thermalshutdown

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS61500

    Typical Application Schematic

    LED Current vs. Input Supply and LED Number

    Input Supply 5 V 12 V

    LED number 4 1000 mA 2000 mA

    LED number 6 600 mA 1200 mA

    LED number 8 450 mA 1000 mA

    Note: Assumption that LED forward voltage is 3.5V, and TPS61500s conversion efficiency is 85%.

    TPS61500

    SW

    SW

    OVP

    FB

    PGND

    PGND

    PGND

    VIN

    EN

    COMP

    DIMC

    FREQ

    S3

    AGND

    PWM

    VIN 5V L1 D1

    C1 C2DL13W LED

    DL2

    DL3

    DL4

    C4R4

    R1

    R2

    R3

    C3

    C5

    ICforpurePWMdimming,withtheaverageLEDcurrentbeingthePWMsignalsdutycycletimesasetLEDcurrent.

    Thedevicefeaturesaprogrammablesoft-startfunctiontolimitinrushcurrentduringstart-upandhasotherprotectionfeaturesbuiltin,suchaspulse-by-pulseovercurrentlimiting,overvoltageprotectionandthermalshutdown.TheTPS61500isavailableina14-pinHTSSOPpackagewithPowerPAD.

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Boost Driver with Integrated Power Switch

    TPS61500

    45

    Boost Driver with Integrated Power Switch

    TPS61500Efficiency vs. Output Current

    PWM Dimming Application Circuit: Circuit for the TPS61500 to Perform Analog Dimming Using an Injected Analog Signal

    Analog Dimming by External DAC: Pure PWM Dimming Method

    LED Current vs. Input Supply and LED Number

    Input Supply 5 V 12 V

    LED number 4 1000 mA 2000 mA

    LED number 6 600 mA 1200 mA

    LED number 8 450 mA 1000 mA

    Note: Assumption that LED forward voltage is 3.5V, and TPS61500s conversion efficiency is 85%.

    TPS61500

    SW

    SW

    OVP

    FB

    PGND

    PGND

    PGND

    VIN

    EN

    COMP

    DIMC

    FREQ

    SS

    AGND

    DSP orcontroller PWM

    0 - 1.229V

    VIN 5V L1 D1

    C1

    DL13W LED

    DL2

    DL3

    DL4C4 C5

    100nFR4

    R1

    R2

    R3C3

    OFF

    ON

    DAC

    TPS61500

    SW

    SW

    OVP

    FB

    PGND

    PGND

    PGND

    VIN

    EN

    COMP

    DIMC

    FREQ

    SS

    AGND

    PWM

    VIN 5V L1 D1

    C1

    C2

    DL13W LED

    DL2

    DL3

    DL4C4

    R4

    R1

    R2

    R1

    R2

    R3

    Q1

    Q2

    PWM

    C3

  • LED Reference Design Cookbook TexasInstruments2Q2010

    1.5-A White LED Driver for Notebooks

    TPS61180/1/2

    1.5-A White LED Driver for Notebooks

    TPS61180/1/2

    46

    Description TheTPS61180/1/2ICsprovidehighlyintegratedsolutionsformedia-sizeLCDbacklighting.Thesedeviceshaveabuilt-in,high-efficiencyboostregulatorwithanintegrated1.5-A/40-VpowerMOSFET.Thesixcurrent-sinkregulatorsprovidehigh-precisioncurrentregulationandmatching.Intotal,thedevicecansupportupto60whiteLEDs(WLEDs).Inaddition,theboostoutputautomaticallyadjustsitsvoltagetotheWLEDforwardvoltagetoimproveefficiency.

    Thedevicessupportpulse-width-modulation(PWM)brightnessdimming.Duringdimming,theWLEDcurrentisturnedon/offatthedutycycle,andfrequencyisdeterminedbythePWMsignalinputontheDCTRLpin.OnepotentialissueofPWMdimmingisaudiblenoisefromtheoutputceramiccapacitors.TheTPS61180/1/2familyisdesignedtominimizethisoutputACripple

    overvoltageprotection,softstartingandthermalshutdown.

    TheTPS61180ICrequiresanexternal3.3-VICsupply,whiletheTPS61181/2ICshaveabuilt-inlinearregulatorfortheICsupply.Allthedevicesareina3-x3-mmQFNpackage.

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS61180,www.ti.com/sc/device/TPS61181orwww.ti.com/sc/device/TPS61182

    Typical Application Schematic

    acrosswidedimming-duty-cycleandfrequencyranges,thereforereducingtheaudiblenoise.

    TheTPS61180/1/2ICsprovideadriveroutputforanexternalPFETconnectedbetweentheinputandinductor.Duringshort-circuitorovercurrentconditions,theICsturnofftheexternalPFETanddisconnectthebatteryfromtheWLEDs.ThePFETisalsoturnedoffduringICshutdown(trueshutdown)topreventanyleakagecurrentfromthebattery.Thedevicealsointegrates

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 4.7 24 Volts

    Output voltage 15 38 Volts

    Output ripple 200 mVPP

    Output current 0 150 mA

    Switching frequency 1000 kHz

    Also Available Soon

    Device Switch Channels Current per Channel LEDs per Channel

    TPS61183 2.0 A 6 30 mA Up to 10

    TPS61185 2.0 A 8 25 mA Up to 10

    TPS61195 2.5 A 8 30 mA Up to 12

    Preview products are listed in bold blue.

    5V to 24V

    EN

    PWM Dimming

    C14.7F

    C31F

    C40.1F

    R162k

    R251

    R3100k

    Optional

    Q1

    L110H

    C24.7FD1 10 WLED in series, 120mA Total

    TPS61181/2

    SWFault

    VO

    IFB1

    IFB2

    IFB3

    IFB4

    IFB5

    IFB6

    PGND

    GND

    VBAT

    CIN

    DCTRL

    EN

    ISET

    NEW!

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    1.5-A White LED Driver for Notebooks

    TPS61180/1/2

    47

    1.5-A White LED Driver for Notebooks

    TPS61180/1/2Switching Waveforms Efficiency vs. PWM Duty

    Start-up Waveforms Output Current vs. Dimming Duty Cycle

    Output Ripple at PWM Dimming Output Ripple at PWM Dimming

    Design Specifications

    Parameter Minimum Typical Maximum Unit

    Input voltage 4.7 24 Volts

    Output voltage 15 38 Volts

    Output ripple 200 mVPP

    Output current 0 150 mA

    Switching frequency 1000 kHz

    Also Available Soon

    Device Switch Channels Current per Channel LEDs per Channel

    TPS61183 2.0 A 6 30 mA Up to 10

    TPS61185 2.0 A 8 25 mA Up to 10

    TPS61195 2.5 A 8 30 mA Up to 12

    Preview products are listed in bold blue.

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Multichannel PWM Power Driver for Power LED Applications

    DRV9812

    Multichannel PWM Power Driver for Power LED Applications

    DRV9812

    48

    Description TheDRV9812,whichhasawideinputvoltageofupto50V,isasynchronousmultichannelPWMpowerdriverforLEDapplications.Itcanbeconfiguredasbuck,boostorbuck/boost,dependingontheapplicationrequirements,andcandrive4independentLEDstringswithupto15powerLEDsinseriesperstring.ItcanalsoprovideDC,sine-wave,oranyotherkindofdesiredcurrenttodriveLEDsbasedonaPWMcontrolalgorithmfromanexternalMCUcontroller.

    Becauseoftheintegratedlow-RDS(on)MOSFETsandintelligentgate-drivedesign,theefficiencyoftheDRV9812canbeashighas96%.Thedeviceoffersintegrated,on-chipsafeguards

    TheDRV9812hasaunique,independentsupplypinforeachchannel,enablingittosupportmultipleoutputswithdifferentpower-supply-voltagerequirementsorwithmixedconvertertopologies.Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/DRV9812

    DRV9812 Typical Application Schematic in Buck Configuration

    againstawiderangeoffaultconditionssuchasshortcircuitsandovercurrentandundervoltageconditions.Italsooffersintegratedtwo-stagethermalprotection.Aprogrammableovercurrentdetectorprovidesanadjustablecycle-by-cyclecurrentlimittomeetdifferentpowerrequirements.

    Design Specifications

    Parameter Minimum Typical Maximum

    Input Voltage (V) 2 50

    Output Voltage (V) 0 49.5

    Gate Voltage (V) 11.4 12.3 13.2

    Peak Output Current (A) 5

    RMS Output Current (A) 2.5

    Switching Frequency (kHz) 10 to 500 1000

    Real-Time MCU(TMS320F2802x/3x,

    C2000, etc.)

    PWM

    12VVIN

    Up to 50V

    VLED

    ADC

    DRV9812

    DH_A

    DH_B

    DH_C

    DH_D

    BST_A

    DL_A

    BST_B

    DL_B

    BST_C

    DL_C

    BST_D

    DL_D

    VREG

    GVDD_A

    AGND

    GND

    GND_A

    GND_B

    GND_C

    GND_D

    GVDD_B

    GVDD_C

    GVDD_D

    VDD

    RESET_AB

    RESET_CD

    PWM_A

    PWM_B

    PWM_C

    PWM_D

    FAULT

    OTW

    OC_ADJ

    M1

    M2

    M3

    AMP AMP AMP AMP

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

    NEW!

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Multichannel PWM Power Driver for Power LED Applications

    DRV9812

    49

    Multichannel PWM Power Driver for Power LED Applications

    DRV9812

    PWM Linearity Curve Efficiency Curve

    DRV9812 Typical Application Schematic in Boost Configuration

    Design Specifications

    Parameter Minimum Typical Maximum

    Input Voltage (V) 2 50

    Output Voltage (V) 0 49.5

    Gate Voltage (V) 11.4 12.3 13.2

    Peak Output Current (A) 5

    RMS Output Current (A) 2.5

    Switching Frequency (kHz) 10 to 500 1000

    PWM

    12V

    AMP

    VIN

    VLED Up to 50V

    AMP AMP AMP

    ADC

    DRV9812

    DH_A

    DH_B

    DH_C

    DH_D

    BST_A

    DL_A

    BST_B

    DL_B

    BST_C

    DL_C

    BST_D

    DL_D

    VREG

    GVDD_A

    AGND

    GND

    GND_A

    GND_B

    GND_C

    GND_D

    GVDD_B

    GVDD_C

    GVDD_D

    VDD

    RESET_AB

    RESET_CD

    PWM_A

    PWM_B

    PWM_C

    PWM_D

    FAULT

    OTW

    OC_ADJ

    M1

    M2

    M3

    Real-Time MCU(TMS320F2802x/3x,

    C2000, etc.)

  • LED Reference Design Cookbook TexasInstruments2Q2010

    TPS61161

    L1: TDK VLCF5020T-220MR75-1C1: Murata GRM188R61E105KC2: Murata GRM21BR71H105KD1: ONsemi MBR0540T1

    VIN

    CTRL

    COMP

    SW

    FB

    RsetR10

    20mA

    C21F

    C11F

    L122H

    GND

    D1

    On/OffDimmingControl

    VI 3V to 18V

    C3220nF

    Small LCD Backlight with Digital and PWM Dimming

    TPS61160/1

    Small LCD Backlight with Digital and PWM Dimming

    TPS61160/1

    50

    Description Witha40-VintegratedswitchFET,theTPS61160/1isaboostconverterthatdrivesupto10LEDsinseries.Theboostconverter,whichallowsfortheuseofhigh-brightnessLEDsingenerallighting,runsatafixedfrequencyof1.2MHzwitha0.7-Aswitch-currentlimit.

    Asshownintheschematicbelowofatypicalapplication,thedefaultwhite-LED(WLED)currentissetwiththeexternalsenseresistor,RSET,andthefeedbackvoltageisregulatedto200mV.TheLEDcurrentcanbecontrolledviatheone-wiredigitalinterface(EasyScaleprotocol)throughtheCTRLpin.Alternatively,aPWMsignalcanbeappliedtothe

    Ordering Information1

    TA Open LED Protection (typical) Package2 Package Marking

    26 V TPS61160DRV BZQ40C to 85C

    38 V TPS61161DRV BZR

    1For most current package and ordering information: www.ti.com/sc/device/TPS61160.2The DRV package is available in tape and reel. Add R suffix (TPR61160DRVR) to order quantities of 3,000 parts per reel or add T suffix

    (TPS61160DRVT) to order 250 parts per reel.

    Key Features Efficientboosttopology Integrated40-Vpowerswitch Drivesupto10LEDs PWMdimmable 200-mVVREF Noaudiblenoise

    Web LinksDatasheets, users guides, samples:www.ti.com/sc/device/TPS61160

    Typical Application Schematic

    CTRLpinsuchthatthedutycycledeterminesthefeedbackreferencevoltage.IneitherdigitalorPWMmode,theTPS61160/1doesnotprovideLEDcurrentinburst;therefore,itdoesnotgenerateaudiblenoiseontheoutputcapacitor.Forprotectionduringopen-LEDconditions,theTPS61160/1hasintegratedcircuitrytopreventtheoutputfromexceedingtheabsolutemaximumratings.

    Formorereferencedesigns,see:www.ti.com/powerreferencedesigns

  • TexasInstruments2Q2010 LED Reference Design Cookbook

    Small LCD Backlight with Digital and PWM Dimming

    TPS61160/1

    51

    Small LCD Backlight with Digital and PWM Dimming

    TPS61160/1

    Ordering Information1

    TA Open LED Protection (typical) Package2 Package Marking

    26 V TPS61160DRV BZQ40C to 85C

    38 V TPS61161DRV BZR

    1For most current package and ordering information: www.ti.com/sc/device/TPS61160.2The DRV package is available in tape and reel. Add R suffix (TPR61160DRVR) to order quantities of 3,000 parts per reel or add T suffix

    (TPS61160DRVT) to order 250 parts per reel.

    Efficiency vs. Output Current

    PWM Dimming Output Ripple

    PWM Dimming Linearity: FB Voltage vs. PWM Duty Cycle

  • LED Reference Design Cookbook TexasInstruments2Q2010

    Small LCD Backlight from LDO

    TPS7510x

    52

    Description TheTPS7510xlinearlow-dropout(LDO)LEDcurrentsourceisoptimizedforlow-powerLEDbacklightingapplicationssuchaskeypadsandnavigationpads.ThedeviceprovidesaconstantcurrentforuptofourunmatchedLEDsorganizedintwobanksoftwoLEDseachinacommon-cathodetopology.Withoutanexternalresistor,thecurrentsourcedefaultstothefactory-programmable,presetcurrentlevelwith0.5%accuracy(typical).Anoptionalexternalresistorcanbeusedtosetinitialbrightnesstouser-programmablevalueswithhigheraccuracy.BrightnesscanbevariedfromofftofullbrightnessbyinputtingaPWMsignaloneachenablepin.Eachbankhasindependentenableandbrightnesscontrol,butthecurrentsofallfourchannelsarematchedconcurrently.Theinput-supplyrangeisideallysuitedforsingle-cellLi-Ionbatterysupplies,andtheTPS7510xcanprovideupto25mAperLED.Nointernalswitchingsignalsareused,eliminatingtroublesomeelectromagneticinterference(EMI).The

    Device Specifications

    Device VIN LEDs IDX MAX VDO IDX Packages

    TPS7510x 2.5 V to 5.5 V 2 mm x 2 mm 25 mA 28 mV 2% WCSP, DSK

    TPS7510x Package Options

    TPS7510xisofferedinanultra-small,9-ball,0.4-mmball-pitchwaferchip-scalepackage(WCSP)anda2.5x2.5-mm,10-pinSONpackage,yieldingaverycompacttotalsolutionsizeidealformobilehandsetsandportablebacklightingapplications.

    Atfirstglance,usingalinearLDOcircuittodriveLEDsmayseemimpractical,giventhelinearregulatorsreputationforlowefficiency.However,theefficiencyofLDOsisoftenmisunderstood.LDOefficiencyisentirelybasedontheinput/output-voltageratio;therefore,theefficiencyofdrivingwhiteLEDs(WLEDs)canbequitehigh.Forexample,drivinga3-VWLEDfroma3.6-VLi-Ion-batteryinputtranslatesintoanLEDefficiencyof83%.

    Figure 1showsatypicalapplicationfortheTPS75105.NotethatthisdevicerequiresnoexternalcomponentstodrivetheWLEDs.Thetotalsolutionisextremelysmallandverycosteffective.

    Figure 2showstheTPS75105efficiencydataforseveraldifferentWLEDforwardvoltagesovertheLi-Ionbatterysrange.TheLEDefficiencyfortheTPS75105iscompa