CX3112 DCDC车充降压方案.pdf

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1、深圳市尚亿微科技有限公司CX3112PWMControl3AStep-DownConverterGENERALDESCRIPTIONT:135(*)4426(*)3532Q:2247(*)114050CX3112consistsofstep-downswitchingregulatorwithPWMcontrol.Thedeviceincludesareferencevoltagesource,oscillationcircuit,erroramplifier,internalPMOSandetc.CX3112provide

2、slow-ripplepower,highefficiency,andexcellenttransientcharacteristics.ThePWMcontrolcircuitisabletothedutyratiolinearlyforms0upto100%.WiththeadditionofaninternalP-channelPowerMOS,acoil,capacitors,andadiodeconnectedexternally,theseICscanfunctionasstep-downswitchingregu

3、lators.TheyserveasidealpowersupplyunitsforportabledeviceswhencoupledwiththeSOP-8L-EPpackage,providingsuchoutstandingfeaturesaslowcurrentconsumption.Sincethisconvertercanaccommodateaninputvoltageupto40V,itisalsosuitablefortheoperationviaanACadapter.FEATURES-Inputvol

4、tage：8Vto40V-Adjustableversionoutputvoltagerangefrom3.3Vto38V-Dutyratio：0%to100%PWMcontrol-Oscillationfrequency：100K/350KHz-Enableandautorestartfunction.-ThermalShutdownfunction/InternalOVP.-ShortCircuitProtect(SCP).-Built-ininternalSWP-channelMOS.-SOP-8L-EPPb-Freep

5、ackage.1/11.Rev.1.3May.23,2011深圳市尚亿微科技有限公司CX3112BLOCKDIAGRAMPINASSIGNMENTThepackageofCX3112isSOP-8L-EP;thepinassignmentisgivenby:NameDescriptionEN/CTON/OFFandautorestartcontrol(TopView)VSSGNDpinEN/CT18FBDrivergateclampingpin.ThepinVGATEmustconnecta0.1uFcapacitorto

6、VSS27SENSE2SWVCCCX3112VGATE36SENSE1VCCOperatingvoltageinputVCC45SWSWSwitchpin.ConnectexternalinductoranddiodehereSOP–8L–EPSENSE1Currentsenseinput1SENSE2Currentsenseinput2FBFeedbackpinORDER/MARKINGINFORMATIONOrderInformationTopMarkingCX3112XXXXLogoCX3112PartnumberAY

7、YWWXIDcode:internalWW:01~52FrequencyPackageTypePackingBlank:100KHzES:SOP-8L-EPBlank:TubeYear:10=2010Blank:AX311211=2011A:350KHzA:TapingA:AX3112A2/11.Rev.1.3May.23,2011深圳市尚亿微科技有限公司CX3112ABSOLUTEMAXIMUMRATINGS(atTA=25°C)CharacteristicsSymbolRatingUnitVCCPinVoltageVCC

8、VSS-0.3toVSS+45VFeedbackPinVoltageVFBVSS-0.3to38VEN/CT,OVPPinVoltageVSS-0.3to6VSENSE1,SENSE2PinVoltageVSS-0.3to38VSwitchPinVoltageVSWVSS-0