21IR IR11672AS智能整流器控制方案

IRIR11672AS智能整流器控制方案关键词：电源管理,整流器,AC/DC转换器,控制器IR公司的IR11672AS是智能整流器控制器,用来驱动隔离反激和谐振半桥转换器中同步整流器的N沟功率MOSFET,最大开关频率为500kHz,关断驱动电流峰值为7A,栅极驱动电压10.7V,具有抗跳动逻辑和UVLO保护,Vcc电压从11.3V到20V,和0.3W待机功耗,能源之星,CECP等标准兼容,典型应用为LCD和PDPTV,通信SMPS,AC/DC适配器,ATXSMPS,服务器SMPS等.本文介绍IR11672AS主要特性,功能方框图,典型连接图和在LLC半桥中的应用电路.IR11672AS:ADVANCEDSMARTRECTIFIERTMCONTROLICIR11672Aisasmartsecondary-sidedriverICdesignedtodriveN-ChannelpowerMOSFETsusedassynchronousrectifiersinisolatedFlybackandresonanthalf-bridgeconverters.TheICcancontroloneormoreparalleledN-MOSFETstoemulatethebehaviorofSchottkydioderectifiers.Thedraintosourcevoltageissenseddifferentiallytodeterminethepolarityofthecurrentandturnthepowerswitchonandoffinproximityofthezerocurrenttransition.Thecycle-by-cycleMOTprotectioncircuitcanautomaticallydetectnoloadconditionandturnoffgatedriveroutputtoavoidnegativecurrentflowingthroughtheMOSFETs.Ruggednessandnoiseimmunityareaccomplishedusinganadvancedblankingschemeanddouble-pulsesuppressionwhichallowreliableoperationinalloperatingmodes.IR11672AS主要特性:SecondarysidehighspeedSRcontrollerDCM,CrCMflybackandResonanthalf-bridgetopologies200VproprietaryICtechnologyMax500KHzswitchingfrequencyAnti-bouncelogicandUVLOprotection7ApeakturnoffdrivecurrentMicropowerstart-up&ultralowquiescentcurrent10.7Vgatedriveclamp50nsturn-offpropagationdelayVccrangefrom11.3Vto20VDirectsensingofMOSFETdrainvoltageEnablefunctionsynchronizedwithMOSFETVDStransitionCyclebyCycleMOTCheckCircuitpreventsmultiplefalsetriggerGATEpulsesLead-freeCompatiblewith0.3WStandby,EnergyStar,CECP,etc.IR11672AS典型应用:LCD&PDPTV,TelecomSMPS,AC-DCadapters,ATXSMPS,ServerSMPS图1.IR11672AS功能方框图AO-Electronics傲壹电子官网：中文网：半桥中的应用电路