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1、IRIRAC1152-350WPFC电源解决方案关键词：电源管理,AC/DC转换器,PFC,IR公司的IRAC1152是固定频率66kHz的功率因素修正IC,采用IR公司的”一周期”控制技术,提供高的PFC和极好的DC总线调整,从而大大地降低元件数量,PCB面积和设计时间.通用85-264VAC输入电压,具有输入低压保护,过压保护,逐个周期的限流,开环保护,VCCUVLO,软起动和小于75uA的微功耗起动电流.本文介绍了R1152主要特性,方框图,应用电路以及采用R1152的350W电源参考计的主要特性指标,电路图
2、,材料清单和PCB布局图.IR1152S:FIXED66kHzFREQUENCY,μPFCONECYCLECONTROLPFCICWITHBROWN-OUTPROTECTIONμPFCIR1152powerfactorcorrectionIC,basedonIRproprietary"OneCycleControl"(OCC)technique,providesforhighPFandexcellentDCBusregulationwhileenablingdrasticreductionincomponentco
3、unt,PCBareaanddesigntimeascomparedtotraditionalsolutions.TheICisdesignedtooperatein85-264VACuniversalinput,continuousconductionmodeBoostPFCatfixed66kHzswitchingfrequency.IR1152featuresincludeinput-linesensedbrown-outprotection,overvoltageprotection,cyclebycycl
4、epeakcurrentlimit,openloopprotection,VCCUVLO,soft-startandmicropowerstartupcurrentoflessthan75μA.Inaddition,forstandbypowerrequirements,theICcanbedrivenintoamicropowersleepmodebypullingtheOVP/ENpinlowwherethecurrentconsumptionislessthan75uA.TheIR1152isavailabl
5、einSO-8packages.R1152主要特性:•PFCICwithIRproprietary“OneCycleControl”•ContinuousconductionmodeboosttypePFC•Fixed66kHzswitchingfrequency•Averagecurrentmodecontrol•Inputlinesensedbrownoutprotection•Outputovervoltageprotection•Openloopprotection•Cyclebycyclepeakcurr
6、entlimit•VCCundervoltagelockout•Programmablesoftstart•Micropowerstartup•Userinitiatedmicropower“SleepMode”•750mApeakgatedrive•LatchimmunityandESDprotection图1.R1152方框图图2.R1152应用电路图IRAC1152-350W参考设计ReferenceDesignKitforIR1152(Fixed66kHzFrequency,OneCycleControlP
7、FCICwithBrown-OutProtection)IRAC1152-350WisafullfunctionAC-DCreferencedesignshowcasingtheoperationofIR1152PFCICinacontinuousconductionmodeboostconverterforachievingpowerfactorcorrection,sub-10%harmoniccurrentdistortionandEN61000-3-2ClassDharmoniccurrentlimitss
8、tandardcompliance.Designedtobeoperatedfrom85-264VACuniversalinputvoltage,IRAC1152-350Wdelivers350Wcontinuousoutputpowerviaafullyregulated388VDCbus.ThankstoIR1152PFCIC,thereferenced
