Offline PWM controller for low standby adapters

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  • The STCH03 current-mode controller isdesigned 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.
    The device features a unique characteristic: it is capable of providing constant output current (CC) regulation 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 167 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 UVP protection 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

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STCH03TR SO-8 Tape And Reel
Active
0.5375 1000 EAR99 CHINA Check Availability

Distributor availability ofSTCH03TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2496 1 Order Now
RS COMPONENTS EUROPE 160 1 Order Now
FUTURE WORLDWIDE 190 1 Order Now
MOUSER WORLDWIDE 2406 1 Order Now

Distributor reported inventory date: 2019-05-19

Distributor Name

DIGIKEY

Stock

2496

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

160

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

190

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2406

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-19

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STCH03LTR SO-8 Tape And Reel
Active
0.5375 1000 EAR99 CHINA Check Availability

Distributor availability ofSTCH03LTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2500 1 Order Now
AVNET AMERICA 2500 0 Order Now
MOUSER WORLDWIDE 2500 1 Order Now
Farnell Element14 EUROPE 98 1 Order Now

Distributor reported inventory date: 2019-05-19

Distributor Name

DIGIKEY

Stock

2500

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2500

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

98

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-19

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STCH03 SO-8 Tube
Active
0.5375 1000 EAR99 CHINA Check Availability

Distributor availability ofSTCH03

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 1900 0 Order Now
MOUSER WORLDWIDE 1977 1 Order Now

Distributor reported inventory date: 2019-05-19

Distributor Name

ARROW

Stock

1900

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1977

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-19

Get sample
STCH03L SO-8 Tube
Active
0.5375 1000 EAR99 CHINA No availability of distributors reported, please contact our sales office

STCH03TR

Package

SO-8

Packing Type

Tape And Reel

Unit Price (US$)

0.5375*

Distributor availability ofSTCH03TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2496 1 Order Now
RS COMPONENTS EUROPE 160 1 Order Now
FUTURE WORLDWIDE 190 1 Order Now
MOUSER WORLDWIDE 2406 1 Order Now

Distributor reported inventory date: 2019-05-19

Distributor Name

DIGIKEY

Stock

2496

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

160

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

190

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2406

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-19

Marketing Status

Active

Unit Price (US$)

0.5375

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

STCH03LTR

Package

SO-8

Packing Type

Tape And Reel

Unit Price (US$)

0.5375*

Distributor availability ofSTCH03LTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2500 1 Order Now
AVNET AMERICA 2500 0 Order Now
MOUSER WORLDWIDE 2500 1 Order Now
Farnell Element14 EUROPE 98 1 Order Now

Distributor reported inventory date: 2019-05-19

Distributor Name

DIGIKEY

Stock

2500

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

2500

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

2500

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

98

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-05-19

Marketing Status

Active

Unit Price (US$)

0.5375

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

STCH03

Package

SO-8

Packing Type

Tube

Unit Price (US$)

0.5375*

Distributor availability ofSTCH03

Distributor Name
Region Stock Min. Order Third party link
ARROW EUROPE 1900 0 Order Now
MOUSER WORLDWIDE 1977 1 Order Now

Distributor reported inventory date: 2019-05-19

Distributor Name

ARROW

Stock

1900

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1977

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-05-19

Marketing Status

Active

Unit Price (US$)

0.5375

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

STCH03L

Package

SO-8

Packing Type

Tube

Unit Price (US$)

0.5375*

Marketing Status

Active

Unit Price (US$)

0.5375

Quantity

1000

ECCN (US)

EAR99

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

Evaluation Tools

    • Part Number

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

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

      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
      1.0
      480.42 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
      AN5280

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

    • 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

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
      Brochure Power management guide 10.2018
      4.42 MB
      PDF
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF

      Brochure Power management guide

      Electric vehicle (EV) ecosystem

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**:

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**:

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.

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