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

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デザイン

技術文書

製品スペック
Description バージョン サイズ
DS6922 DS6922: Synchronous rectifier smart driver for LLC resonant converters 3.0 390 KB
アプリケーションノート
Description バージョン サイズ
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

プレゼンテーション & トレーニング資料

プレゼンテーション
Description バージョン サイズ
Secondary regulation Synchronous rectification controllers 2 MB

Publications and Collaterals

パンフレット
Description バージョン サイズ
Brochure Power management guide 05.2016 2 MB
サポート & コミュニティ



サンプル & 購入

製品型番 パッケージ Packing Type Marketing Status Unit Price (US$) * 数量 ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
SRK2000DTR SO-8 Tape And Reel Active 0.93 1000 NEC EAR99 MOROCCO MORE INFO サンプル入手 買い物かごに追加 DISTRIBUTOR AVAILABILITY
SRK2000D SO-8 Tube Active 0.93 1000 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

品質 & 信頼性

製品型番 Marketing Status パッケージ Grade RoHS Compliance Grade Material Declaration**
SRK2000DTR アクティブSO-8IndustrialEcopack2 0 0
SRK2000D アクティブSO-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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