Irs2548d Led Combo Press Final
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Transcript of Irs2548d Led Combo Press Final
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COMPANY CONFIDENTIAL 11
IRS2548D
LED Driver IC
PFC and Half Bridge driver comboPeter Green LED Group Mgr
Energy Saving Products Business Unit
April 2011
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COMPANY CONFIDENTIAL
LED Lighting Introduction
Small LEDs developed in 1960s for indication
High Brightness / High Power LEDs now available
Lumens per Watt better than Incandescent / Halogenlamps
Lumens per Watt equal or better than Fluorescent orHIDlamps
HB/HP LEDs being adopted in general illumination
Typical applications; bulb replacements, light fixtures,Street lamps
LEDs have longer operating life, typically 50000 hours
LEDs offer better reliability / durability
LEDs are easier to control and dim
LEDs offer reduced Lumen depreciation
(less light output reduction over time)
LEDs are normally DC driven
LEDs are driven by constant current
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COMPANY CONFIDENTIAL
High Power LED Applications
LED Street Light
Typically 120W per cobra head
Example opposite uses 4 x 30W
LED panels
One LED driver per cobra head
Typically 1.4A output
Single or multi channel outputOptimize for efficiency (series LED
connection) or redundancy (4 channel
output)
High Lumen output / directed light
Controllable light output (PWM or linear dimming)Galvanically isolated low voltage outputs (safety)
Open and short circuit protected
Wide input voltage range 90 to 305VAC
High power factor and low THD
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COMPANY CONFIDENTIAL 4
Power Factor Control is Power Quality
PFC regulations apply to:
China : China Compulsory Certificate (CCC)
Europe : IEC 1000-3-2
Japan : JIC C 61000-3-2
For products >75W (>26W for lighting applications)
Power Factor
Relationship between voltage and current waveforms
Measure of power quality that affects transmission network efficiency
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COMPANY CONFIDENTIAL
IRS2548D
Critical conduction mode (CrCM) PFC Control
THD reduction by on time modulation
Variable frequency oscillator (current controlled)Half bridge driver
PWM dimming input (ENN) also disables PFC
Over current protection (PFC and Half bridge)
Fixed internal 1.6uS half bridge (HO and LO) dead time
Internal bootstrap MOSFET
Internal 15.6V zener clamp diode on VCC
Micropower startup (250uA)
Latch immunity and ESD protection
Maximum half bridge offset voltage 600VGate drive output current (PFC, HO, LO) +/-0.5A
14 lead SOIC package
For LED driver and SMPS applications (typically > 50W)
For wide AC input voltage range 90 to 305 VAC
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COMPANY CONFIDENTIAL
IRS2548D Target Applications
OFF LINE LED
LIGHT FIXTURES
Incandescent
Replacement
HID
Replacement
Handheld LEDLamps
AUTOMOTIVE
LCD Back Light
Handheld
Devices
Fluorescent
Replacement
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L
N
E
EMI Filter & Rectifier
Output
IFB
Half-Bridge StagePFC Boost Converter
7
Two Stage LED Driver
IRS2548D
PFC + Half Bridge Driver IC
Combo IC Solution
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IRS2548D Typical Schematic
RVBUS 1
RLO
+
RVBUS 2
C1
L
N
RV1F1
CVS
DCP2
DCP1
CCOMP
COCROC
MPFC
CVBUS2
CVBUS1
RPFC
RZX
CVBUS
RVBUS
RFMIN
RVCC
CCS
RCS
RF1
RLM1RLM2
RHOMHS
MLS
CBS
CVCC1CVCC
+
+
BR1
C2
L1
CY
GND
DPFCLPFC
RFMAX
CRES
DOUT1
DOUT2
COUT
RPU
RCL
CVS
Reg+5V
LED+
LED-
RD1
RD2
RD3
RV1
RV2
CF1
CF2
2
ENN
1
2
3
VBUS
4
5
7
FMIN
6
7 8
13
12
11
10
9
14
OC
COMP
ZX
PFC
HO
VS
VB
VCC
COM
LO
CS
IRS254
8D
ROC
PFC MOSFET OPTO ISOLATOR
(Feedback)
Half Bridge MOSFETs
Rectifier
Diodes/MOSFETs
Voltage and
Current
Feedback
Frequency Control Input Bus Voltage Feedback
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IRS2548D Demo Board IRPLLED5Features:
High output current regulation90-305VAC universal input
Dimmable with 1-10V DC input
Non-latched shutdown against
output over-voltage
Using IRS2548DSLED control IC
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Test Results
Load: 2 x Eco Lumens EPAD connected in series
VACin(Vrms)
Pin
(W)
PF THDi
(%)
Fs
(kHz)
Vout
(Vdc)
Iout
(Adc)
Pout
(W)
Eff
(%)
100 55.1 0.999 2.3 42.8 39.2 1.22 47.8 86.8
120 55.4 0.998 6.4 42.8 39.1 1.23 48.1 86.8
220 55.0 0.979 13.1 42.8 39.1 1.24 48.5 88.2
240 55.1 0.972 15.6 42.8 39.1 1.24 48.5 88.0
277 55.5 0.952 18.3 42.8 39.1 1.25 48.9 88.1
Driving
32 x Samsung Sunnix6HPLED packs
Total Power = 55W
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Output V-I Characteristic
Green = LED Voltage
Blue = LED Current
Open circuit voltage < 60V
Current ripple ~15%
Short circuit current = 1.5A
Voltage vs Current
010
20
30
40
50
60
00.2
0.4
0.6
0.8 1
1.2
1.4
1.6
Current (A)
Voltage(V)
V-I
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90 to
305VAC50/60Hz
2 Channel
Driver
+48V
0V~ PFC IsolationVoltageControl
Power Converter
EMI filter/
Rectification
2 Channel
Driver
2 Channel
Driver
700mA
700mA
Multi Channel LED Concept
One main power converter supplies
48V isolated DC bus
Wide input voltage range 90 to 305VAC
High power factor and low THD
Output modules provide 2 x 700mA
regulated current outputs
IRS2548D BasedPower Stage
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IRS2548D IC Summary
For LED driver and SMPS applications (typically > 50W)
For wide AC input voltage range 90 to 305 VAC
High Power Factor and Low THDResonant Half Bridge Topology / Soft Switching
Efficiency better than 85% above 50W
Efficiency improves at higher power levels
Suitable for isolated LED drivers > 50W
Efficiency and flexibility surpasses Flyback solution above 50W
Protected against short circuit in primary and secondary stages
Enables regulated output current loop for LED driving
Incorporates PWM dimming input, allows dimming to ~2% output