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  • The SRK2000A smart driver implements a control scheme specific to 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 interlocking logic circuit prevents the two synchronous rectifier MOSFETs from conducting simultaneously.
    The control scheme in this IC allows for each synchronous rectifier to be switched on as the corresponding half-winding starts conducting and switched off as its current goes to zero. The SRK2000A device implements matched turn-off MOSFET thresholds. A unique feature of this IC is its intelligent automatic sleep mode. It allows the detection of a low-power operating condition for the converter and puts the IC into a low consumption sleep mode where gate driving is stopped and quiescent consumption is reduced. In this way, converter efficiency improves at light load, where synchronous rectification is no longer beneficial. The IC automatically exits sleep mode and restarts switching as it recognizes that the load for the converter has increased.
    A noticeable feature is the very low external component count required.

    Key Features

    • Secondary side synchronous rectifier controller optimized for LLC resonant converters
    • Protection against current reversal
    • Safe management of load transient, light load and startup condition
    • Matched turn-off thresholds
    • Intelligent automatic sleep mode at light load
    • Dual gate driver for N-channel MOSFETs with 1 A source and 3.5 A sink drive current
    • Operating voltage range 4.5 to 32 V
    • Programmable UVLO with hysteresis
    • 250 µA quiescent consumption
    • Operating frequency up to 500 kHz
    • Available in SO-8 package

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Related Applications

Lighting and Controls

Power Supplies and Converters

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS9993
      Synchronous rectifier smart driver for LLC resonant converters
      3.0
      406.67 KB
      PDF
      DS9993

      Synchronous rectifier smart driver for LLC resonant converters

    • Description Version Size Action
      AN3233
      12 V - 150 W resonant converter with synchronous rectification using L6563H, L6599A, and SRK2000A
      2.0
      1.73 MB
      PDF
      AN4027
      12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6699 and SRK2000A
      3.0
      2.82 MB
      PDF
      AN3014
      19 V, 90 W resonant converter with synchronous rectification using L6563H, L6599A and SRK2000A
      3.1
      1.59 MB
      PDF
      AN3233

      12 V - 150 W resonant converter with synchronous rectification using L6563H, L6599A, and SRK2000A

      AN4027

      12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6699 and SRK2000A

      AN3014

      19 V, 90 W resonant converter with synchronous rectification using L6563H, L6599A and SRK2000A

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**
SRK2000A
Active
SO-8 Industrial Ecopack2
SRK2000ATR
Active
SO-8 Industrial Ecopack2

SRK2000A

Package:

SO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

SRK2000ATR

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
SRK2000A Available at 4 distributors

Distributor availability ofSRK2000A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2566 1 Order Now
Newark Element14 AMERICA 879 0 Order Now
MOUSER WORLDWIDE 3348 1 Order Now
Farnell Element14 EUROPE 1298 1 Order Now

Distributor reported inventory date: 2020-08-09

Distributor Name

DIGIKEY

Stock

2566

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

879

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3348

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1298

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-09

Buy now
Active
EAR99 NEC Tube SO-8 - - PHILIPPINES 0.604 / 1k
SRK2000ATR Available at 2 distributors

Distributor availability ofSRK2000ATR

Distributor Name
Region Stock Min. Order Third party link
P&S ASIA/PACIFIC 22 1 Order Now
MOUSER WORLDWIDE 30 1 Order Now

Distributor reported inventory date: 2020-08-09

Distributor Name

P&S

Stock

22

Min.Order

1

Region

ASIA/PACIFIC Order Now

MOUSER

Stock

30

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-09

Buy now
Active
EAR99 NEC Tape And Reel SO-8 - - PHILIPPINES 0.604 / 1k

SRK2000A

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.604 / 1k

Distributor availability ofSRK2000A

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2566 1 Order Now
Newark Element14 AMERICA 879 0 Order Now
MOUSER WORLDWIDE 3348 1 Order Now
Farnell Element14 EUROPE 1298 1 Order Now

Distributor reported inventory date: 2020-08-09

Distributor Name

DIGIKEY

Stock

2566

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

879

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3348

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1298

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-08-09

ECCN (EU)

NEC

Packing Type

Tube

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.604 / 1k

Country of Origin

PHILIPPINES

SRK2000ATR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.604 / 1k

Distributor availability ofSRK2000ATR

Distributor Name
Region Stock Min. Order Third party link
P&S ASIA/PACIFIC 22 1 Order Now
MOUSER WORLDWIDE 30 1 Order Now

Distributor reported inventory date: 2020-08-09

Distributor Name

P&S

Stock

22

Min.Order

1

Region

ASIA/PACIFIC Order Now

MOUSER

Stock

30

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-09

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SO-8

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.604 / 1k

Country of Origin

PHILIPPINES

(*) 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