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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

All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      EVAL-STCH03-45W

      Active

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

      PSU and Converter Solution Eval Boards --

      EVL80WLED-STCH03

      Active

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

      PSU and Converter Solution Eval Boards --

      EVLSTCH03-36W-SR

      Active

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

      PSU and Converter Solution Eval Boards --

      EVLSTCH03-45WPD

      Active

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

      PSU and Converter Solution Eval Boards --

      STEVAL-SMACH15V1

      Active

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

      PSU and Converter Solution Eval Boards ST

      STEVAL-USBPD45C

      Active

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

      PSU and Converter Solution Eval Boards ST
      EVAL-STCH03-45W

      Description:

      45W / 12V power supply based on STCH03 QR flyback controller and SRK1000B adaptive synchronous rectification controller
      EVL80WLED-STCH03

      Description:

      EVL80WLED-STCH03: 80W-1A primary side current loop control LED driver with STCH03 for street lighting applications
      EVLSTCH03-36W-SR

      Description:

      36W USB charger with selectable output voltage (5-9-12 V @3A) based on STCH03L and SRK1000B
      EVLSTCH03-45WPD

      Description:

      45W USB Type-C Power Delivery 3.0 adapter based on STCH03, SRK1001 and STUSB4761
      STEVAL-SMACH15V1

      Description:

      15 W 5 V output USB adapter evaluation board with STCH03 CC-mode primary sensing switching controller
      STEVAL-USBPD45C

      Description:

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

EDA Symbols, Footprints and 3D Models

STMicroelectronics - STCH03

Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.

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Symbols

Footprints

Footprints

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3D models

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

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 6 distributors

Distributor availability ofSTCH03TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2259 1 Order Now
RS COMPONENTS EUROPE 40 1 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 2500 0 Order Now
MOUSER WORLDWIDE 1136 1 Order Now
Farnell Element14 EUROPE 178 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

2259

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

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1136

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

178

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

Free Sample Buy Direct
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 2471 1 Order Now
AVNET AMERICA 2500 0 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
MOUSER WORLDWIDE 2489 1 Order Now
Farnell Element14 EUROPE 132 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

2471

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

2489

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

132

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

Free Sample Buy Direct
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 1440 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

ARROW

Stock

3970

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1440

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-28

Free Sample Buy Direct
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 2259 1 Order Now
RS COMPONENTS EUROPE 40 1 Order Now
AVNET AMERICA 2500 0 Order Now
ARROW EUROPE 2500 0 Order Now
MOUSER WORLDWIDE 1136 1 Order Now
Farnell Element14 EUROPE 178 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

2259

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

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1136

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

178

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

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 2471 1 Order Now
AVNET AMERICA 2500 0 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
MOUSER WORLDWIDE 2489 1 Order Now
Farnell Element14 EUROPE 132 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

DIGIKEY

Stock

2471

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

2489

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

132

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-28

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 1440 1 Order Now

Distributor reported inventory date: 2020-10-28

Distributor Name

ARROW

Stock

3970

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

1440

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-10-28

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