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  • The SRK1000/A/B are controllers intended for secondary side synchronous rectification (SR) in flyback converters, suitable for operation in QR and mixed CCM/DCM fixed frequency circuits.

    They provide 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 it is then switched off as current approaches zero.
    The fast turn-on, with minimum delay, and the 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 SR MOSFET conduction becomes lower than the programmed minimum TON. In this way, converter efficiency improves at light load where synchronous rectification is no longer beneficial.
    After the converter restarts switching or 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 3.75 to 32 V
    • CC regulation operation down to 2 V output supported
    • Very low quiescent current in low consumption mode (160 μA)
    • High-voltage sensing input for SR MOSFET drain-source voltage (100 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 min. TON and fixed min. TOFF (3 options: SRK1000, SRK1000A, SRK1000B)
    • Low consumption mode entry by primary side burst-mode detection or by detection of SR MOSFET conduction lower than programmed min TON
    • SOT23-6L package

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    • Part number
      Status
      Description
      Type
      Supplier

      EVLSRK1000A-PF

      Active

      SRK1000A adaptive synchronous rectification controller for flyback converter demonstration board with logic level SR MOSFET

      PSU and Converter Solution Eval Boards --

      EVLSRK1000A-TO

      Active

      SRK1000A adaptive synchronous rectification controller for flyback converter demonstration board with STF80N10F7

      PSU and Converter Solution Eval Boards --
      EVLSRK1000A-PF

      Description:

      SRK1000A adaptive synchronous rectification controller for flyback converter demonstration board with logic level SR MOSFET
      EVLSRK1000A-TO

      Description:

      SRK1000A adaptive synchronous rectification controller for flyback converter demonstration board with STF80N10F7

CAD/EDA Symbols, Footprints and Models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SRK1000ATR
Active
SOT23-6L Industrial Ecopack2

SRK1000ATR

Package:

SOT23-6L

Material Declaration**:

Marketing Status

Active

Package

SOT23-6L

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
SRK1000ATR Available at 5 distributors

Distributor availability ofSRK1000ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2905 1 Order Now
AVNET AMERICA 3000 0 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
MOUSER WORLDWIDE 2622 1 Order Now
Farnell Element14 EUROPE 3000 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

2905

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

MOUSER

Stock

2622

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-6L - - MALAYSIA 0.26 / 1k

SRK1000ATR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.26 / 1k

Distributor availability ofSRK1000ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2905 1 Order Now
AVNET AMERICA 3000 0 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
MOUSER WORLDWIDE 2622 1 Order Now
Farnell Element14 EUROPE 3000 1 Order Now

Distributor reported inventory date: 2020-10-23

Distributor Name

DIGIKEY

Stock

2905

Min.Order

1

Region

WORLDWIDE Order Now

AVNET

Stock

3000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

MOUSER

Stock

2622

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-10-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-6L

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.26 / 1k

Country of Origin

MALAYSIA

(*) 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