Adaptive synchronous rectification controller for LLC resonant converter

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  • The SRK2001 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 driving one or more 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 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 innovative turn-on logic with adaptive masking time and the adaptive turn-off logic allows 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/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 to 32 V
    • High voltage drain-to-source Kelvin sensing for each SR MOSFET
    • Operating frequency up to 500 kHz
    • 35 ns total delay at turn-off
    • Protection against current reversal
    • Safe management of load transient, light-load and startup conditions
    • Intelligent automatic sleep mode at light-load with user programmable enter/exit load levels, with soft transitions and function disable
    • Programmable exit load levels from burst mode
    • Compatible with standard level MOSFETs
    • SSOP10 package

Sample & Buy

Part Number
Package
Packing Type
Marketing Status
Budgetary Price (US$)*
Quantity
ECCN (US)
Country of Origin
Order from Distributors
Order from ST
SRK2001TR SSOP 10 Tape And Reel
Active
0.836 1000 EAR99 CHINA Check Availability

Distributor availability ofSRK2001TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 794 1 Order Now
RS COMPONENTS EUROPE 1990 1 Order Now
MOUSER WORLDWIDE 4169 1 Order Now
Farnell Element14 EUROPE 2495 1 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

794

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1990

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

4169

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2495

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

Get sample
SRK2001 SSOP 10 Tube
Active
0.836 1000 EAR99 MOROCCO Check Availability

Distributor availability ofSRK2001

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1995 1 Order Now
MOUSER WORLDWIDE 1653 1 Order Now
Farnell Element14 EUROPE 2000 1 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

1995

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

1653

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

Buy now

SRK2001TR

Package

SSOP 10

Packing Type

Tape And Reel

Unit Price (US$)

0.836*

Distributor availability ofSRK2001TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 794 1 Order Now
RS COMPONENTS EUROPE 1990 1 Order Now
MOUSER WORLDWIDE 4169 1 Order Now
Farnell Element14 EUROPE 2495 1 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

794

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1990

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

4169

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2495

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

Marketing Status

Active

Unit Price (US$)

0.836

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

SRK2001

Package

SSOP 10

Packing Type

Tube

Unit Price (US$)

0.836*

Distributor availability ofSRK2001

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1995 1 Order Now
MOUSER WORLDWIDE 1653 1 Order Now
Farnell Element14 EUROPE 2000 1 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

1995

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

1653

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

Marketing Status

Active

Unit Price (US$)

0.836

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MOROCCO

(*) 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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      Evaluation board for SRK2001 adaptive synchronous rectification controller for LLC resonant converter with high voltage external sensing MOSFETs

      Evaluation board: SRK2001 adaptive synchronous rectification controller for LLC resonant converters with STP120N4F6

      Evaluation board: SRK2001 adaptive synchronous rectification controller for LLC resonant converters with STP77N6F6

      Evaluation board: SRK2001 adaptive synchronous rectification controller for LLC resonant converters with STL140N4LLF5

      12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS10811
      Adaptive synchronous rectification controller for LLC resonant converter
      5.0
      456.94 KB
      PDF
      DS10811

      Adaptive synchronous rectification controller for LLC resonant converter

    • Description Version Size Action
      AN4677
      12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001
      1.0
      3.11 MB
      PDF
      AN5034
      12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller
      1.0
      6.38 MB
      PDF
      AN5118
      12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller
      1.0
      5.26 MB
      PDF
      AN4674
      SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family
      2.0
      963.78 KB
      PDF
      AN4677

      12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001

      AN5034

      12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller

      AN5118

      12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller

      AN4674

      SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family

    • 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

    • Description Version Size Action
      AN4677
      12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001
      1.0
      3.11 MB
      PDF
      AN4674
      SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family
      2.0
      963.78 KB
      PDF
      AN4677

      12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001

      AN4674

      SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family

Presentations & Training Material

    • Description Version Size Action
      EuP Lot 6 Tier2 Ecodesign requirements for Standby
      2.2 MB
      PDF
      Secondary regulation Synchronous rectification controllers
      2.35 MB
      PDF

      EuP Lot 6 Tier2 Ecodesign requirements for Standby

      Secondary regulation Synchronous rectification controllers

Publications and Collaterals

    • Description Version Size Action
      Power Management Guide 06.2019
      5.5 MB
      PDF

      Power Management Guide

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SRK2001
Active
SSOP 10 Industrial Ecopack2
SRK2001TR
Active
SSOP 10 Industrial Ecopack2

SRK2001

Package:

SSOP 10

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SSOP 10

Grade

Industrial

RoHS Compliance Grade

Ecopack2

SRK2001TR

Package:

SSOP 10

Material Declaration**:

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.