IR公司的IR11672AS是智能整流器控制器,用來驅(qū)動隔離反激和諧振半橋轉(zhuǎn)換器中同步整流器的N溝功率MOSFET,最大開關(guān)頻率為500kHz,關(guān)斷驅(qū)動電流峰值為7A,柵極驅(qū)動電壓10.7V,具有抗跳動邏輯和UVLO保護(hù),Vcc電壓從11.3V到20V,和0.3W待機(jī)功耗,能源之星,CECP等標(biāo)準(zhǔn)兼容,典型應(yīng)用為LCD和PDPTV,通信SMPS,AC/DC適配器,ATXSMPS,服務(wù)器SMPS等.本文介紹IR11672AS主要特性,功能方框圖,典型連接圖和在LLC半橋中的應(yīng)用電路.IR11672AS:ADVANCEDSMARTREC
IR公司的IR11672
AS是智能
整流器控制器,用來驅(qū)動隔離反激和諧振半橋轉(zhuǎn)換器中同步整流器的N溝
功率MOSFET,最大
開關(guān)頻率為500kHz,關(guān)斷驅(qū)動
電流峰值為7A,柵極驅(qū)動電壓10.7V,具有抗跳動邏輯和UVLO保護(hù),
Vcc電壓從11.3V到20V,和0.3W待機(jī)功耗,能源之星,CECP等標(biāo)準(zhǔn)兼容, 典型應(yīng)用為
LCD和PDP TV,通信SMPS,AC/DC適配器,ATX SMPS,服務(wù)器SMPS等.本文介紹IR11672AS主要特性, 功能方框圖, 典型連接圖和在LLC半橋中的應(yīng)用電路.
IR11672AS: ADVANCED SMART RECTIFIER TM C
ONTROL
ICIR11672A is a smart secondary-side driver IC designed to drive N-Channel
powerMOSFETs used as synchronous rectifiers in isolated Flyback and resonant half-bridge converters. The IC can control one or more paralleled N-MOSFETs to emulate the behavior of Schottky diode rectifiers. The drain to source voltage is sensed differentially to determine the polarity of the current and turn the power switch on and off in proximity of the zero current transition. The cycle-by-cycle MOT protection circuit can automatically detect no load condition and turn off gate driver output to avoid negative current flowing through the MOSFETs.
Ruggedness and noise immunity are accomplished using an advanced blanking scheme and double-pulse suppression which allow reliable operation in all operating modes.
IR11672AS主要特性:
Secondary side high speed SR controller
DCM, CrCM flyback and Resonant half-bridge topologies
200V proprietary IC technology
Max 500KHz switching frequency
Anti-bounce logic and UVLO protection
7A peak turn off drive current
Micropower start-up &
amp; ultra low quiescent current
10.7V gate drive clamp
50ns turn-off propagation delay
Vcc range from 11.3V to 20V
Direct sensing of MOSFET drain voltage
Enable function synchronized with MOSFET VDS transition
Cycle by Cycle MOT Check Circuit prevents multiple false trigger GATE pulses
Lead-free
Compatible with 0.3W Standby, Energy Star, CECP,
etc.
