From simple SMPS to high efficiency type-C solutionsEnabling smart SMPS

Rogerio BUENO

IPC Marketing

Agenda

# Parts positioning

# STCH03

# SRK1001

# Evaluation boards

# Design Tools

# Takeaways

AC-DC SMPS spec vs ST proposal

20W

L656x

L6599A, L6699

0W 75W 100W

(Embedded MOS)

VIPerPlus family

Flyback ConverterFlyback

Controller + ext. MOSPFC + Flyback PFC + LLC

Power

L6566xx,

HVLED001A,

STCH03

+SRK100x

L656x, HVLED001A

STCH03

L6566xx

3

STCH03

STCH03 Quasi Resonant Flyback Controller

5

• Constant current mode (CC)

from primary side and voltage

control from secondary side

• 650V embedded HV start-up

circuit

• Quasi-resonant (QR) Zero

Voltage Switching (ZVS)

operation

• Valley skipping at medium-light

load and advanced burst mode

operation at no-load

• Accurate adjustable output OVP

and UVP

• SO8 package

Features

• Low part count. BOM

reduction thanks to an

extensive features integration

• Exceeding 5 stars: No-Load

power < 10mW

• HV start-up zero power

consumption

• Advanced burst-mode

operation

• Flexibility: suitable for

adapters from 5W to 75W

• High Efficiency

• Low EMI design: intelligent

jitter for EMI suppression

Benefits

STCH03 – QR mode - advantages

P = 0.75W

VD-S

Vsw

500V

P=0.03W

VD-S

Vsw

100V

P = 0.27W

VD-S

VswVsw

300V

VD-S

For Example:

Cd = 100pF, f = 60kHz𝑃𝐶𝑙𝑜𝑠𝑠𝑒𝑠 =1

2𝑉𝑆𝑊2 𝐶𝑑𝑓

SRK1001

Typical schematics & product mapping

8

85 – 265 Vac

Vout

STCH03

STPSx40,60,100,

FERD

Power Schottky &

FERD diodes

+

FROM : Flyback with Rectifiers TO : Flyback with Sync Rectifier

SRK100x

85 – 265 Vac

Vout

STCH03

SRK100x

SR controller

MOSFET

F7 series MOSFET

+

Why to use SR9

Efficiency improvement

Efficiency gain w/wo SR

6.9%

4.2%

3.2%

2.0%

0.1%0.0%

1.0%

2.0%

3.0%

4.0%

5.0%

6.0%

7.0%

8.0%

5V 9V 12V 18V 24V

?

Remarks: Measurements done on EVLSTCH03-36W-SR 230Vin, max output: 3.0A or 35W

Vout:

Thermal behaviour comparison 10

With synchronous rectification With Schottky diode

MOSFET – 52.4°C

PowerFLAT 5x6

Schottky – 112°C

PowerFLAT 5x6

Remarks: Measurements done on EVLSTCH03-36W-SR 230Vin, max output: 3.0A or 35W

SRK1000 & SRK1001 - overview

11

adapters and chargers, Quick chargers, USB power delivery (profile 3, 4,...)

adapters and chargers, Quick chargers, USB power delivery (profile 3, 4, 5,...),

Industrial SMPS

SOT23-6 SO8……15V….Vout…..19V……

Secondary side SYNCHRONOUS RECTIFICATION controller for FLYBACK

converters used to drive the SR MOSFET in order to increase efficiency

SRK1001 key features

12

High-voltage sensing input - High Efficiency - Low consumption

Synchronous Rectification controller for Flyback topology in 8 pins

• For Flyback converters in Quasi Resonant and Mixed DCM/CCM fixed frequency operation

• DVS voltage rating: 185 V

• Wide Vcc operating voltage range: 4.5 V - 32 V

• CC regulation supported down to Vout = 2 V

• Driving Standard level SR MOSFET

• Very low quiescent current (160 µA typ) in low-consumption-mode

• Low consumption mode management by Primary burst-mode detection and Sleep-mode function:

• Programmable blanking after turn-on

• Programmable blanking after turn-off

• Operating frequency up to 300 KHz

• High-current gate-drive output: 1 A sink current, 0.6 A source current

• Disable pin to remote ON-OFF and Asynchronous turn-off

• Synchronization pin for SR turn-off during CCM operation

• SO8 PACKAGE

KEY APPLICATIONS

• Adapters

• Chargers, Quick chargers

• USB power delivery (profile 3, 4,...)

SO8

VAUX

TOFF

TON

GD

DIS/SYNC

GND

DVSVCC

SRK1001 Evalboards

13

Board MOSFET PACKAGE Controller

EVLSRK1000-TO 100V – 10mR TO220FP SRK1000

EVLSRK1000-DP 100V – 10mR DPAK SRK1000

EVLSRK1000-PF 100V – 8mR PwFlat 5x6 SRK1000

EVLSRK1000A-TO 100V – 10mR TO220FP SRK1000A

EVLSRK1000A-PF 100V – 8mR PwFlat 5x6 SRK1000A

EVLSRK1000B-TO 100V – 10mR TO220FP SRK1000B

EVLSRK1000B-PF 100V – 8mR PwFlat 5x6 SRK1000B

EVLSRK1001-TO 150 V – 19 mΩ TO220FP SRK1001

EVLSRK1001-PF 150 V – 11 mΩ PwFlat 5x6 SRK1001

STUSB4761 – Type C – PD implementation

14

High performance evalboard

USB-PD 45W adapter - EVLSTCH03-45WPD

1616

Full Kit solution with lower design complexity

STCH03

Flyback

Controller

AC Cable

Power

MOSFETRectifier

MOSFET

OPTO

SRK1001

SR

Controller

STUSB4761

PD

Controller

with CC/CV

reference

DISCH.

FET

Load

Switch

Type C Cable

Power Supplies Power Hubs

Wide HV Power MOSFETs product range with reduced switching losses, easy driving

features and lower design complexity.

High efficient and fully integrated AC-DC controller with primary CC regulation

enabling, low stand-by power, high efficiency and low EMI design of AC-DC adaptersSTCH03

M6

Synchronous rectifier controller intended for secondary side SR in flyback converters,

suitable for operation in QR and mixed CCM/DCM fixed frequency circuits. SRK1001

The STUSB4761 is an hard-coded USB PD controller able to negotiate a given amount

of power to be sourced to an inquiring consumer device.STUSB4761

USB-PD 2.0 & 3.0 Power Rules

17

PD Power (W) Current (A)

at 5V

Current (A)

at 9V

Current (A)

at 15V

Current (A)

at 20V

0.5 ≤ x ≤ 15 x ÷ 5

15 < x ≤ 27 3 x ÷ 9

27 < x ≤ 45 3 3 x ÷ 15

45 < x ≤ 60 3 3 3 x ÷ 20

60 < x ≤ 100 3 3 3 x ÷ 20 (*)

(*) Requires a 5A cable

PDO : Power Data Object

(Voltage, Current)

100W

Efficiency Measures and No Load Consumption

18

Input voltage No load consumption

115Vac <30mW

230Vac <30mWboard: 70mmx50mmx25mm

Percent

of rated

load

Efficiency %

5 V output 9 V output 12 V output 15 V output 20 V output

115 Vac

60 Hz

230 Vac

50 Hz

115 Vac

60 Hz

230 Vac

50 Hz

115 Vac

60 Hz

230 Vac

50 Hz

115 Vac

60 Hz

230 Vac

50 Hz

115 Vac

60 Hz

230 Vac

50 Hz

10% 83.5 73.8 86.0 78.5 86.1 80.2 87.6 81.3 82.7 78.8

25% 86.7 81.3 89.7 86.6 89.9 87.7 89.4 88.1 88.3 87.0

50% 87.2 84.9 90.2 89.3 90.7 89.8 90.4 90.4 90.1 89.8

75% 86.7 85.6 90.0 89.8 90.5 90.5 90.6 91.1 90.5 90.8

100% 86.12 85.6 89.8 90.1 90.2 90.8 90.4 91.4 90.7 91.3

avg eff.

%86.7 84.4 89.9 88.9 90.3 89.7 90.2 90.3 89.9 89.7

USB-PD 45W adapter - EVLSTCH03-45WPD

Power Magnetics – Flyback Transformer

19

Input Filter Inductor

20

BOM – Wurth Content

21

Ref. Part/Value Description Manufacturer Wurth PN Comments Datasheet

J1 20A-300Vac PCB Header Male/Female WÜrth Electronics 691351500002

J2 1054500101 Connector USB 3.1, type C, 90° WÜrth Electronics 632723100011 closest match, different footprint

L1 47uH-1.8A Fixed Inductor WÜrth Electronics 7447462470

RV1 275Vac-25A SIOV metal oxide varistors WÜrth Electronics 820412711

R27 47R-0.0625W Thick Film Chip WÜrth Electronics 561020132004 size0612;±5%;0.75w; https://www.we-online.com/catalog/datasheet/561020132004.pdf

R29 100R-0.0625W Thick Film Chip WÜrth Electronics 561020132008 size0612;±1%;0.75w; https://www.we-online.com/catalog/datasheet/561020132008.pdf

R31 0R010-0.750W Power Thick Film Chip WÜrth Electronics 580060720008 size0805;±1%;0.5w; https://www.we-online.com/catalog/datasheet/580060720008.pdf

R33 100R-0.250W Thick Film Chip WÜrth Electronics 561020132008 size0612;±1%;0.75w; https://www.we-online.com/catalog/datasheet/561020132008.pdf

T1 750344353rev00 Transformer WÜrth Electronics 750344353

Q.ty Ref Part / Value Description Manufacturer Order code Wurth PN Comments Datasheet

1 CN1 IN-CON 300VAC 5.08MM VERTICAL WURTH 691311500102 -

2 CN3,CN4 CON5 Header 7x1 pitch WURTH 61300711821 61300711821

1 C6 1µF 50V ±10% Ceramic X7R WURTH 885012207103 -

3 C10,C18,C20 100nF 50V ±10% Ceramic X7R WURTH 885012207098 -

1 C11 220pF 50V ±10% Ceramic X7R WURTH 885012207082 -

1 C12 1nF 50V ±10% Ceramic X7R WURTH 885012207086 -

2 C15,C21 (not mounted) Ceramic X7R WURTH 885012207098 -

1 C19 1µF 10V ±10% Ceramic X7R WURTH 885012207022 -

1 L1 47µH CHOKE WURTH 7447462470 -

1 L2 2x100µH 250VAC Common Mode WURTH 744841210 -

2 R12,R13 0.51 1W ±1% 100ppm/°C WURTH 561070332078 561070332078 size0612;±1%;1w;

https://www.we-

online.com/catalog/datashe

et/561070332078.pdf

1 CN5 IN-CON-PLUG straight pluggable WURTH 691351500002 -

1 CN1 HEADER 5 Header 5x1 pitch WURTH 61300511121 -

1 CN2 USB TYPE-C Type-C WURTH 632723300011 -

2 CN3, CN4 P-CONN Header 7x1 pitch WURTH 61300711121 -

1 CN5 UART (not mounted) Header 2x1 pitch WURTH 61300211121 -

4C2, C7, C13,

C1410nF 10V ±10% Ceramic X7R WURTH 885012205012 -

3 C4, C5, C20 100nF 16V ±10% Ceramic X7R WURTH 885012205037 -

2 C10, C11 mounted) Ceramic C0G, NP0 WURTH 885012005040 -

2 L1, L2 470 Ω 250 mA Ferrite Bead WURTH 7427927141 -

1 SW1 RST PushButton SPST WURTH 434121043836 434121043836

1 Y1 Crystal WURTH 830055663 830055663 closest match, 18pF,

eDesignSuitehttps://www.st.com/edesignsuite

eDesignSuite

23

Advanced Product Selector

From user specifications

to ST’s Solution

Powerful simulation & Design Tool

Generates, optimizes and simulates designs that maximize

the number of ST’s products in the BOM

Flexible D-Power Configurator

Enables easy & fast parameterization, validation and

optimized code generation for digital power supply

Takeaways

Takeaways

STCH03 / SRK1001 / STUSB4761 –

High performance controllers which enable

design SMPS from 20 up to 70W with usb type

C capabilities

eDesign Suite– enable our customer to

design on-line SMPS based on STCH03 and

reduce time-to-market

EVLSTCH03-45WPD– simplify USB

typeC power supply with Power Delivery

capabilities and ultra-low stand-by power

consumption

Wurth – partner for passive components that

help designer to implement robust and reliable

solutions

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