SRK1001

Active
Design Win Education

Adaptive synchronous rectification controller for flyback converter

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Product overview

Description

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.

  • All 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

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All tools & software

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      Status
      Description
      Type
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      Description:

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EDA Symbols, Footprints and 3D Models

STMicroelectronics - SRK1001

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3D models

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

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Part Number
Marketing Status
Budgetary Price (US$)*/Qty
Order from ST
Order from distributors
Package
Packing Type
RoHS
Country of Origin
ECCN (US)
ECCN (EU)
SRK1001TR
Active
0.4392 / 1k
Available at 2 distributors

Distributor availability of SRK1001TR

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 2736 1
MOUSER WORLDWIDE 2354 1

Distributor reported inventory date: 4/1/2025

SO-8 Tape and Reel CHINA EAR99 NEC
SRK1001
Active
0.4392 / 1k
Available at 2 distributors

Distributor availability of SRK1001

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 896 1
DIGIKEY WORLDWIDE 1604 1

Distributor reported inventory date: 4/1/2025

SO-8 Tube CHINA EAR99 NEC

SRK1001TR Active

Budgetary Price (US$)*/Qty:
0.4392 / 1k
Package:
SO-8
Packing Type:
Tape and Reel
RoHS:
Country of Origin:
CHINA
ECCN (US):
EAR99
ECCN (EU):
NEC

Part Number:

SRK1001TR

Distributor Name

Farnell Element14

Stock

2736

Min.Order

1

MOUSER

Stock

2354

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 4/1/2025

SRK1001 Active

Budgetary Price (US$)*/Qty:
0.4392 / 1k
Package:
SO-8
Packing Type:
Tube
RoHS:
Country of Origin:
CHINA
ECCN (US):
EAR99
ECCN (EU):
NEC

Part Number:

SRK1001

Distributor Name

MOUSER

Stock

896

Min.Order

1

Region

WORLDWIDE Buy from Distributor

DIGIKEY

Stock

1604

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 4/1/2025

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