STCH03

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Offline PWM controller for low standby adapters

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  • The STCH03 current-mode controller is designed for an offline quasi-resonant ZVS (zero-voltage-switching at switch turn-on) flyback converter.

    It combines a high-performance low-voltage PWM controller chip and a 650V HV start-up cell in the same package.
    Constant output voltage (CV) regulation loop is achieved by secondary side feedback, the output voltage information is transfered via an optocoupler on the FB pin of the STCH03 to get the selected output voltage.
    The device features a unique characteristic: it is capable of providing constant output current regulation (CC) using primary-sensing feedback. This eliminates the need for dedicated current reference IC, as well as the current sensor, still maintaining quite accurate output current regulation.
    The quasi-resonant operation is achieved by means of a transformer demagnetization sensing input that triggers the turn-on of the MOSFET, connected on the ZCD pin. This input serves also as both output voltage monitor, to achieve mains-independent CC regulation (line voltage feedforward), and to implement OVP and UVP.
    The maximum switching frequency is top-limited below 154 kHz, so that at the medium-light load a special function automatically lowers the operating frequency whilst still maintaining the operation as close to ZVS as possible. At the very light load, the device enters a controlled burst-mode operation that, along with the zero-power high-voltage start-up circuit, the extremely low quiescent current of the device, helps minimize the residual input consumption, thus meeting the requirements of the most stringent standards.
    During the burst-mode operation the VDD supply voltage has to be guaranteed by optimum application design. In any case, an innovative adaptive UVLO helps to minimize the issues related to the fluctuations of the auxiliary biasing voltage with the output load, due to parasitic capacitance of the transformer and further reducing the IC's bias consumption.
    In addition to these functions that optimize power handling under different operating conditions, the device also offers the output overvoltage protection (OVP), overtemperature protection (OTP), hiccup-mode protection that is invoked when the transformer saturates or the secondary diode fails short and the output undervoltage protection (UVP) that limits the average output current in case of the output short-circuit. All the protections are auto-restart mode, except the OVP protection, that can be internally selected to be auto-restart or latched mode.
    The embedded leading-edge blanking on the current sense input for greater noise immunity completes the equipment of this device.

    Key Features

    • Advanced power management for ultra-low standby power consumption (under 10 mW at 230 VAC)
    • Fully integrated primary side constant current output regulation (CC)
    • 650 V embedded HV start-up circuit with zero power consumption.
    • Quasi-resonant (QR) zero-voltage-switching (ZVS) operation
    • Accurate and adjustable output OVP with options auto-restart (STCH03) or latched (STCH03L) after fault
    • Output undervoltage protection (UVP) with auto-restart
    • Input voltage feedforward compensation for mains-independent CC regulation
    • Embedded thermal shutdown
    • Intelligent frequency jitter for EMI suppression
    • SO8 package

Recommended for you

Evaluation Tools

    • Part Number

      45W / 12V power supply based on STCH03 QR flyback controller and SRK1000B adaptive synchronous rectification controller

      EVL80WLED-STCH03: 80W-1A primary side current loop control LED driver with STCH03 for street lighting applications

      36W USB charger with selectable output voltage (5-9-12 V @3A) based on STCH03L and SRK1000B

      45W USB Type-C Power Delivery 3.0 adapter based on STCH03, SRK1001 and STUSB4761

      15 W 5 V output USB adapter evaluation board with STCH03 CC-mode primary sensing switching controller

      45 W USB Type-C™ Power Delivery adapter reference design based on STCH03, STM32F051 and STUSB1602A

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS12460
      Offline PWM controller for low standby adapters
      2.0
      609.88 KB
      PDF
      DS12460

      Offline PWM controller for low standby adapters

    • Description Version Size Action
      AN5280
      36W USB charger with selectable output voltage (5-9-12 V @3A) based on STCH03L and SRK1000B
      1.0
      6.72 MB
      PDF
      AN5442
      45W USB Type-C™ PD adapter board with controllers STCH03 QR flyback,SRK1001 adaptive synchronous rectifier and STUSB4761 USB Type-C™ PD
      1.1
      14.03 MB
      PDF
      AN5280

      36W USB charger with selectable output voltage (5-9-12 V @3A) based on STCH03L and SRK1000B

      AN5442

      45W USB Type-C™ PD adapter board with controllers STCH03 QR flyback,SRK1001 adaptive synchronous rectifier and STUSB4761 USB Type-C™ PD

    • Description Version Size Action
      DT0118
      A Procedure for Restoring Bootloader Functionality to the STNRG388A
      1.0
      367.56 KB
      PDF
      DT0118

      A Procedure for Restoring Bootloader Functionality to the STNRG388A

    • Description Version Size Action
      AN5189
      15 W 5 V output USB adapter board with STCH03 CC-mode primary sensing switching controller
      1.0
      1.87 MB
      PDF
      AN5280
      36W USB charger with selectable output voltage (5-9-12 V @3A) based on STCH03L and SRK1000B
      1.0
      6.72 MB
      PDF
      AN5442
      45W USB Type-C™ PD adapter board with controllers STCH03 QR flyback,SRK1001 adaptive synchronous rectifier and STUSB4761 USB Type-C™ PD
      1.1
      14.03 MB
      PDF
      AN5351
      EVL80WLED-STCH03: 80W-1A primary side current loop control LED driver with STCH03 for street lighting applications
      1.0
      6.21 MB
      PDF
      AN5499
      How to implement adaptive synchronous rectification in flyback converters using STM32 MCUs
      1.0
      369.66 KB
      PDF
      AN5164
      STEVAL-USBPD45C 45 W USB Type-C™ Power Delivery adapter
      2.0
      1.41 MB
      PDF
      AN5430
      The STUSB4761 PCB routing guidelines
      1.1
      396.92 KB
      PDF
      AN5189

      15 W 5 V output USB adapter board with STCH03 CC-mode primary sensing switching controller

      AN5280

      36W USB charger with selectable output voltage (5-9-12 V @3A) based on STCH03L and SRK1000B

      AN5442

      45W USB Type-C™ PD adapter board with controllers STCH03 QR flyback,SRK1001 adaptive synchronous rectifier and STUSB4761 USB Type-C™ PD

      AN5351

      EVL80WLED-STCH03: 80W-1A primary side current loop control LED driver with STCH03 for street lighting applications

      AN5499

      How to implement adaptive synchronous rectification in flyback converters using STM32 MCUs

      AN5164

      STEVAL-USBPD45C 45 W USB Type-C™ Power Delivery adapter

      AN5430

      The STUSB4761 PCB routing guidelines

Presentations & Training Material

    • Description Version Size Action
      Primary side regulation controllers portfolio
      1.1 MB
      PDF

      Primary side regulation controllers portfolio

Publications and Collaterals

    • Description Version Size Action
      STCH03 Ultra-Low Standby Power Supplies 06.2018
      1.27 MB
      PDF

      STCH03 Ultra-Low Standby Power Supplies

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      Power Management Guide 07.2020
      7.12 MB
      PDF

      Electric vehicle (EV) ecosystem

      Power Management Guide

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STCH03
Active
SO-8 Industrial Ecopack2
STCH03L
Active
SO-8 Industrial Ecopack2
STCH03LTR
Active
SO-8 Industrial Ecopack2
STCH03TR
Active
SO-8 Industrial Ecopack2

STCH03

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

STCH03L

Package:

SO-8

Material Declaration**:

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

STCH03LTR

Package:

SO-8

Material Declaration**:

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

STCH03TR

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
STCH03TR Available at 5 distributors

Distributor availability ofSTCH03TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2284 1 Order Now
RS COMPONENTS EUROPE 40 1 Order Now
AVNET AMERICA 2500 0 Order Now
MOUSER WORLDWIDE 4518 1 Order Now
Farnell Element14 EUROPE 200 1 Order Now

Distributor reported inventory date: 2020-08-03

Distributor Name

DIGIKEY

Stock

2284

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

40

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

4518

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

200

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-03

Get sample Buy now
Active
EAR99 NEC Tape And Reel SO-8 - - CHINA 0.5375 / 1k
STCH03LTR Available at 5 distributors

Distributor availability ofSTCH03LTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2476 1 Order Now
AVNET AMERICA 2500 0 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
MOUSER WORLDWIDE 2497 1 Order Now
Farnell Element14 EUROPE 132 1 Order Now

Distributor reported inventory date: 2020-08-03

Distributor Name

DIGIKEY

Stock

2476

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

2500

Min.Order

2500

Region

WORLDWIDE Order Now

MOUSER

Stock

2497

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

132

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-03

Get sample Buy now
Active
EAR99 NEC Tape And Reel SO-8 - - CHINA 0.5375 / 1k
STCH03 Available at 2 distributors

Distributor availability ofSTCH03

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 3970 0 Order Now
MOUSER WORLDWIDE 1628 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

ARROW

Stock

3970

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1628

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-02

Get sample Buy now
Active
EAR99 NEC Tube SO-8 - - CHINA 0.5375 / 1k
STCH03L No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tube SO-8 - - CHINA 0.5375 / 1k

STCH03TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.5375 / 1k

Distributor availability ofSTCH03TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2284 1 Order Now
RS COMPONENTS EUROPE 40 1 Order Now
AVNET AMERICA 2500 0 Order Now
MOUSER WORLDWIDE 4518 1 Order Now
Farnell Element14 EUROPE 200 1 Order Now

Distributor reported inventory date: 2020-08-03

Distributor Name

DIGIKEY

Stock

2284

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

40

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

4518

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

200

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-03

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.5375 / 1k

Country of Origin

CHINA

STCH03LTR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.5375 / 1k

Distributor availability ofSTCH03LTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2476 1 Order Now
AVNET AMERICA 2500 0 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
MOUSER WORLDWIDE 2497 1 Order Now
Farnell Element14 EUROPE 132 1 Order Now

Distributor reported inventory date: 2020-08-03

Distributor Name

DIGIKEY

Stock

2476

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

2500

Min.Order

2500

Region

WORLDWIDE Order Now

MOUSER

Stock

2497

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

132

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-03

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.5375 / 1k

Country of Origin

CHINA

STCH03

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.5375 / 1k

Distributor availability ofSTCH03

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 3970 0 Order Now
MOUSER WORLDWIDE 1628 1 Order Now

Distributor reported inventory date: 2020-08-02

Distributor Name

ARROW

Stock

3970

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1628

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-02

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.5375 / 1k

Country of Origin

CHINA

STCH03L

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.5375 / 1k

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.5375 / 1k

Country of Origin

CHINA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors