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  • The SRK1001 controller is designed for secondary side synchronous rectification (SR) in flyback converters, suitable for operation in QR and mixed CCM/DCM fixed frequency circuits.

    It provides a high-current gate-drive output capable of driving N-channel Power MOSFETs.
    The control scheme of this IC is such that the SR MOSFET is switched on as soon as current starts flowing through its body diode, and then switched off as current approaches zero.
    The fast turn-on with minimum delay and innovative adaptive turn-off logic allow maximizing the conduction time of the SR MOSFET and eliminating the effect of parasitic inductance in the circuit.
    The device enters low consumption mode when it detects primary controller burst-mode operation, or when the DIS pin is pulled up by the user, or when the SR MOSFET conduction falls below the programmed minimum TON. This improves the converter efficiency at light load, where synchronous rectification is no longer beneficial.
    After the converter restarts switching or the DIS pin goes low again and the IC detects that the current conduction in the rectifiers has increased 20% above the min TON programmed value, the IC exits low consumption mode and resumes switching operation.

    Key Features

    • Secondary side synchronous rectification controller optimized for flyback converter
    • Suitable for QR and mixed CCM/DCM fixed frequency operation
    • Wide VCC operating voltage range 3.7 to 32 V
    • CC regulation operation down to 2V output supported
    • Very low quiescent current in low consumption mode (170 µA)
    • High-voltage sensing input for SR MOSFET drain-source voltage (185 V AMR)
    • Operating frequency up to 300 kHz
    • High-current gate-drive output for N-MOSFET
    • Fast turn-on with minimum delay time and adaptive turn-off logic
    • Programmable minimum TON and TOFF
    • Low consumption mode entry by DIS pin, by primary side burst-mode detection or by detection of SR MOSFET conduction lower than programmed min. TON
    • SO8 package

Recommended for you

Evaluation Tools

    • Part Number

      SRK1001 adaptive synchronous rectification controller for flyback converter demonstration board with SR MOSFET

      SRK1001 adaptive synchronous rectification controller for flyback converter demonstration board with SR MOSFET

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

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS13155
      Adaptive synchronous rectification controller for flyback converter
      1.0
      600.58 KB
      PDF
      DS13155

      Adaptive synchronous rectification controller for flyback converter

    • Description Version Size Action
      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
      AN5333
      SRK1001 adaptive synchronous rectification controller for flyback converters evaluation board family
      1.0
      1.75 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

      AN5333

      SRK1001 adaptive synchronous rectification controller for flyback converters evaluation board family

    • Description Version Size Action
      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
      AN5333
      SRK1001 adaptive synchronous rectification controller for flyback converters evaluation board family
      1.0
      1.75 MB
      PDF
      AN5430
      The STUSB4761 PCB routing guidelines
      1.1
      396.92 KB
      PDF
      AN5442

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

      AN5333

      SRK1001 adaptive synchronous rectification controller for flyback converters evaluation board family

      AN5430

      The STUSB4761 PCB routing guidelines

Presentations & Training Material

    • Description Version Size Action
      Secondary regulation Synchronous rectification controllers
      2.35 MB
      PDF

      Secondary regulation Synchronous rectification controllers

Publications and Collaterals

    • Description Version Size Action
      Power Management Guide 07.2020
      7.12 MB
      PDF

      Power Management Guide

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SRK1001
Active
SO-8 Industrial Ecopack2
SRK1001TR
Active
SO-8 Industrial Ecopack2

SRK1001

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

SRK1001TR

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.

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
SRK1001TR Available at 3 distributors

Distributor availability ofSRK1001TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 840 1 Order Now
Farnell Element14 EUROPE 1000 1 Order Now
RUTRONIK EUROPE 10 2500 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

MOUSER

Stock

840

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1000

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

10

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

Buy now
Active
EAR99 NEC Tape And Reel SO-8 - - CHINA 0.33 / 1k
SRK1001 No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tube SO-8 - - CHINA 0.33 / 1k

SRK1001TR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.33 / 1k

Distributor availability ofSRK1001TR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 840 1 Order Now
Farnell Element14 EUROPE 1000 1 Order Now
RUTRONIK EUROPE 10 2500 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

MOUSER

Stock

840

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1000

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

10

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-10

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.33 / 1k

Country of Origin

CHINA

SRK1001

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.33 / 1k

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.33 / 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