SYNCHRONOUS RECTIFIER SMART DRIVER FOR LLC RESONANT CONVERTER

The SRK2000 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. 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
  • 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

电路原理图

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设计

技术文档

产品规格
Description Version Size
DS6922 DS6922: Synchronous rectifier smart driver for LLC resonant converters 3.0 390 KB
应用手册
Description Version Size
AN3233 AN3233: 12 V - 150 W resonant converter with synchronous rectification using the L6563H, L6599A, and SRK2000 1.0 2 MB
AN3014 AN3014: 19 V, 90 W resonant converter with synchronous rectification using the L6563H, L6599A and SRK2000 2.1 1004 KB
AN3303 AN3303: Secondary-side rectification for an LLC resonant converter featuring the SRK2000 2.0 2 MB

演示和培训资料

简报
Description Version Size
Secondary regulation Synchronous rectification controllers 2 MB

出版刊物和宣传资料

手册
Description Version Size
Brochure Power management guide 05.2016 7 MB
支持和社区



样片和购买

型号 Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
SRK2000DTR SO-8 Tape And Reel Active - - NEC EAR99 MOROCCO MORE INFO 获取样片 Add to cart DISTRIBUTOR AVAILABILITY
SRK2000D SO-8 Tube Active - - NEC EAR99 MOROCCO MORE INFO DISTRIBUTOR AVAILABILITY
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(*) 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

质量和可靠性

型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
SRK2000DTR ActiveSO-8IndustrialEcopack2 0 0
SRK2000D ActiveSO-8IndustrialEcopack2 0 0
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(**) 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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