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1、TIUCC28180满负荷效率高达95%的PFC控制方案关键词：电源管理,AC/DV转换器,PFC,UCC28180TI公司的UCC28180是工作在连续导通模式(CCM)的PFC控制器,可得到高的电源效率,低电流失真和极好的电压调整,非常适合于100瓦到几千瓦的AC/DC转换器,开关频率从18kHz到250kHz,支持功率MOSFET和IGBT开关,主要用在服务器和台式电源,白色家电,工业电源和平板电视如PDP,LCD和LEDTV．本文介绍了UCC28180主要特性，框图,以及360W评估板U
2、CC28180EVM-573主要特性,电路图,测试连接图,材料厂清单和PCB元件布局图. TheUCC28180isaflexibleandeasy-to-use,8-pin,activePowerFactorCorrection(PFC)controllerthatoperatesunderContinuousConductionMode(CCM)toachievehighPowerFactor,lowcurrentdistortionandexcellentvoltageregulation
3、ofboostpre-regulatorsinAC-DCfront-ends.ThecontrollerissuitableforuniversalACinputsystemsoperatingin100-Wtofew-kWrangewiththeswitchingfrequencyprogrammablebetween18kHzto250kHz,toconvenientlysupportbothpowerMOSFETandIGBTswitches.Anintegrated1.5-Aand2-A
4、(SRC-SNK)peakgatedriveoutput,clampedinternallyat15.2V(typical),enablesfastturn-on,turn-offandeasymanagementoftheexternalpowerswitchwithouttheneedforbuffercircuits.Low-distortionwaveshapingoftheinputcurrentusingaveragecurrentmodecontrolisachievedwitho
5、utinputlinesensing,reducingtheexternalcomponentcount.Inaddition,thecontrollerfeaturesreducedcurrentsensethresholdstofacilitatetheuseofsmallvalueshuntresistorsforreducedpowerdissipation,especiallyimportantinhighpowersystems.Toenablelowcurrentdistortio
6、n,thecontrolleralsofeaturestrimmedinternalcurrentloopregulationcircuitsforeliminatingassociatedinaccuracies.Simpleexternalnetworksallowforflexiblecompensationofthecurrentandvoltagecontrolloops.Inaddition,UCC28180offersanenhanceddynamicresponsecircuit
7、thatisbasedonthevoltagefeedbacksignaltodeliverimprovedresponseunderfastloadtransients,bothforoutputover-voltageandunder-voltageconditions.AnuniqueVCOMPdischargecircuitprovidedinUCC28180isactivatedwheneverthevoltagefeedbacksignalexceedsVOVP_L thusallo
8、wingachanceforthecontrollooptostabilizequicklyandavoidencounteringtheover-voltageprotectionfunctionwhenPWMshut-offcanoftencauseaudiblenoise.Controlledsoftstartgraduallyregulatestheinputcurrentduringstart-upandreducesstressonthepowerswitches.Numerouss
