Adaptive synchronous rectification controller for LLC resonant converter

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  • The SRK2001A controller implements a control scheme specific for secondary side synchronous rectification in LLC resonant converters that use a transformer with center tap secondary winding for full wave rectification.

    It provides two high current gate drive outputs, each capable of directly driving N-channel power MOSFETs. Each gate driver is controlled separately and an interlock logic circuit prevents the two synchronous rectifier MOSFETs from conducting simultaneously.
    The driver high-level voltage is clamped to 11 V in order to avoid providing excessive gate charge to SR MOSFETs, in case the device is supplied at higher VCC voltages.
    The control scheme in this IC provides for each synchronous rectifier being switched on as the corresponding half-winding starts conducting and switched off as its current goes to zero.
    The turn-on logic with adaptive masking time (up to 10% of clock cycle) and innovative adaptive turn-off logic allow maximizing the conduction time of the SR MOSFETs, eliminating the need of the parasitic inductance compensation circuit.
    The low consumption mode of the device allows to meet the most stringent requirement for converter power consumption in light-load and no load conditions.
    A noticeable feature is the very low external component count required.

    Key Features

    • Secondary side synchronous rectification controller optimized for LLC resonant converter
    • Dual gate driver for N-channel MOSFETs
    • Adaptive turn-off logic
    • Turn-on logic with adaptive masking time
    • Auto-compensation of parasitic inductance
    • Low consumption mode: 50 μA quiescent current
    • VCC operating voltage range 4.5 V to 32 V
    • High voltage drain-to-source Kelvin sensing for each SR MOSFET
    • Operating frequency up to 500 kHz
    • Programmable exit load levels from burst-mode
    • SSOP10 package

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Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
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SRK2001ATR SSOP 10 Tape And Reel
Active
0.836 1000 EAR99 MOROCCO Check Availability

Distributor availability ofSRK2001ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 15738 1 Order Now
MOUSER WORLDWIDE 14716 1 Order Now
Farnell Element14 EUROPE 1925 1 Order Now

Distributor reported inventory date: 2019-12-04

Distributor Name

DIGIKEY

Stock

15738

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

14716

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1925

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-04

Buy now
SRK2001A SSOP 10 Tube
Active
0.836 1000 EAR99 CHINA Check Availability

Distributor availability ofSRK2001A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2000 1 Order Now
Newark Element14 AMERICA 475 0 Order Now
MOUSER WORLDWIDE 1724 1 Order Now
Farnell Element14 EUROPE 1284 1 Order Now

Distributor reported inventory date: 2019-12-04

Distributor Name

DIGIKEY

Stock

2000

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

475

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1724

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1284

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-04

Buy now

SRK2001ATR

Package

SSOP 10

Packing Type

Tape And Reel

Unit Price (US$)

0.836*

Distributor availability ofSRK2001ATR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 15738 1 Order Now
MOUSER WORLDWIDE 14716 1 Order Now
Farnell Element14 EUROPE 1925 1 Order Now

Distributor reported inventory date: 2019-12-04

Distributor Name

DIGIKEY

Stock

15738

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

14716

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1925

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-04

Marketing Status

Active

Unit Price (US$)

0.836

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MOROCCO

SRK2001A

Package

SSOP 10

Packing Type

Tube

Unit Price (US$)

0.836*

Distributor availability ofSRK2001A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2000 1 Order Now
Newark Element14 AMERICA 475 0 Order Now
MOUSER WORLDWIDE 1724 1 Order Now
Farnell Element14 EUROPE 1284 1 Order Now

Distributor reported inventory date: 2019-12-04

Distributor Name

DIGIKEY

Stock

2000

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

475

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1724

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1284

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-04

Marketing Status

Active

Unit Price (US$)

0.836

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

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS11726
      Adaptive synchronous rectification controller for LLC resonant converter
      2.0
      507.31 KB
      PDF
      DS11726

      Adaptive synchronous rectification controller for LLC resonant converter

    • Description Version Size Action
      DT0084
      Application of SRK2001 in higher output voltage circuits with external sensing MOSFETs
      1.0
      405.25 KB
      PDF
      DT0084

      Application of SRK2001 in higher output voltage circuits with external sensing MOSFETs

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 06.2019
      4.89 MB
      PDF

      Power Management Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SRK2001A
Active
SSOP 10 Industrial Ecopack2
SRK2001ATR
Active
SSOP 10 Industrial Ecopack2

SRK2001A

Package:

SSOP 10

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SSOP 10

Grade

Industrial

RoHS Compliance Grade

Ecopack2

SRK2001ATR

Package:

SSOP 10

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SSOP 10

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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