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ap1506.pdf

ap1506.pdf

上传者: hdingguo 2012-04-02 评分 0 0 0 0 0 0 暂无简介 简介 举报

简介:本文档为《ap1506pdf》,可适用于IT/计算机领域,主题内容包含APKHz,APWMBuckDCDCConverterThisdatasheetcontainsnewproductinformationAnach符等。

APKHz,APWMBuckDCDCConverterThisdatasheetcontainsnewproductinformationAnachipCorpreservestherightstomodifytheproductspecificationwithoutnoticeNoliabilityisassumedasaresultoftheuseofthisproductNorightsunderanypatentaccompanythesaleoftheproductRevOct,„FeaturesOutputvoltage:V,V,VandadjustableoutputversionAdjustableversionoutputvoltagerange,VtoVKHzfixedswitchingfrequencyVoltagemodenonsynchronousPWMcontrolThermalshutdownandcurrentlimitprotectionONOFFshutdowncontrolinputOperatingvoltagecanbeuptoVOutputloadcurrent:ATOLandTOLpackagesLowpowerstandbymodeBuiltinswitchingtransistoronchip„ApplicationsSimpleHighefficiencystepdownregulatorOncardswitchingregulatorsPositivetonegativeconverter„GeneralDescriptionTheAPseriesaremonolithicICdesignedforastepdownDCDCconverter,andowntheabilityofdrivingaAloadwithoutexternaltransistorDuetoreducingthenumberofexternalcomponent,theboardspacecanbesavedeasilyTheexternalshutdownfunctioncanbecontrolledbylogiclevelandthencomeintostandbymodeTheinternalcompensationmakesfeedbackcontrolhavegoodlineandloadregulationwithoutexternaldesignRegardingprotectedfunction,thermalshutdownistopreventovertemperatureoperatingfromdamage,andcurrentlimitistopreventovercurrentoperatingoftheoutputswitchIfcurrentlimitfunctionoccurredandVFBisdowntoVbelow,theswitchingfrequencywillbereducedTheAPseriesoperateataswitchingfrequencyofKHzthusallowingsmallersizedfiltercomponentsthanwhatwouldbeneededwithlowerfrequencyswitchingregulatorsOtherfeaturesincludeaguaranteedtoleranceonoutputvoltageunderspecifiedinputvoltageandoutputloadconditions,andontheoscillatorfrequencyTheoutputversionincludedfixedV,V,V,andanadjustabletypeThepackagesareavailableinastandardleadTOpackageoraleadTO„PinAssignmentsTOL(TopView)(TopView)TOLVINSDFBGndOutputMetalTabGNDVINSDFBGndOutput„PinDescriptionsNameDescriptionVINOperatingvoltageinputOutputSwitchingoutputGNDGroundFBOutputvoltagefeedbackcontrolSDONOFFShutdownAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„OrderingInformationPackageT:TOLK:TOLOutputversionAPXXXXXPackingBlank:TubeA:TapingBlank:Adjustable:V:V:VTR:TOL(R)LeadFreeBlank:NormalL:LeadFreePackage„BlockDiagramCurrentSourcebiasVReferenceVRegulatorkHzOSCStartupThermalShutdownPredriverCompCompGndOutputVINSDFBmVmVASwitchAmpCompFrequecycompensationAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„AbsoluteMaximumRatingsSymbolParameterRatingUnitVCCSupplyVoltageVVSDONOFFPininputvoltagetoVVFBFeedbackPinvoltagetoVVOUTOutputvoltagetoGroundVPDPowerdissipationInternallylimitedWTSTStoragetemperaturetooCTOPOperatingtemperaturetooCVOPOperatingvoltagetoV„ElectricalCharacteristics(AllOutputVoltageVersions)Unlessotherwisespecified,VIN=VforV,V,adjustableversionandVIN=VfortheVversionILOAD=ASymbolParameterConditionsMinTypMaxUnitIFBFeedbackbiascurrentVFB=V(Adjustableversiononly)nAFOSCOscillatorfrequencyKHzFSCPOscillatorfrequencyofshortcircuitprotectWhencurrentlimitoccurredandVFB<V,Ta=oCKHzVSATSaturationVoltageIOUT=ANooutsidecircuitVFB=VforcedriveronVMaxDutyCycle(ON)VFB=VforcedriveronDCMinDutyCycle(OFF)VFB=VforcedriveroffICLCurrentlimitPeakcurrentNooutsidecircuitVFB=forcedriveronAOutput=VNooutsidecircuitVFB=forcedriveroffuAILOutput=VOutputleakagecurrentVIN=VmAIQQuiescentCurrentVFB=forcedriveroffmAISTBYStandbyQuiescentCurrentONOFFpin=VVIN=VuAVILLow(regulatorON)VIHONOFFpinlogicinputthresholdvoltageHigh(regulatorOFF)VIHONOFFpinlogicinputcurrentVLOGIC=V(OFF)ILONOFFpininputcurrentVLOGIC=V(ON)uATOLθJCThermalResistanceTOLJunctiontocaseoCWTOLθJAThermalResistanceWithcopperareaofapproximatelyinTOLJunctiontoambientoCWSpecificationswithboldfacetypeareforfulloperatingtemperaturerange,theothertypeareforTJ=ºCAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„ElectricalCharacteristics(Continued)SymbolParameterConditionsTypLimitUnitFBVOutputFeedbackV<VIN<VA<ILOAD<AVOUTprogrammedforVVVMINVMAXAPADJηEfficiencyVIN=V,ILOAD=AOUTVOutputvoltageV<VIN<VA<ILOAD<AVVMINVMAXAPVηEfficiencyVIN=V,ILOAD=AOUTVOutputvoltageV<VIN<VA<ILOAD<AVVMINVMAXAPVηEfficiencyVIN=V,ILOAD=AOUTVOutputvoltageV<VIN<VA<ILOAD<AVVMINVMAXAPVηEfficiencyVIN=V,ILOAD=ASpecificationswithboldfacetypeareforfulloperatingtemperaturerange,theothertypeareforTJ=ºCAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„TypicalPerformanceCharacteristicsAPEfficiencyvsTemperature(Vin=V,Vout=V,Io=A)Temperature(TA)(C)Efficiency()APEfficiencyvsTemperature(Vin=V,Vout=V,Io=A)Temperature(TA)(C)Efficiency()APSaturationVoltagevsTemperature(Vcc=V,Vfb=V,VSD=)Temperature(TA) (C)SaturationVoltage(V)AAAAAPSwitchCurrentLimitvsTemperature(Vcc=V,Vfb=V)Temperature(TA)(C)SwitchCurrentLimit(A)APSupplyCurrentvsTemperature(Vcc=V,NoLoad,Vonoff=V(SwitchON),Vonoff=V(SwitchOFF))Temperature(TA)(C)SupplyCurrent(mA)SwitchONTemperature(TA)(C)SupplyCurrent(uA)SwitchOFFAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„TypicalPerformanceCharacteristics(Continued)APThresholdVoltagevsTemperature(Vcc=V,Io=mA)Temperature(TA)(C)ThresholdVoltage(V)APONOFFCurrentvsONOFFVoltage(Vin=V)ONOFFVoltage(V)ONOFFCurrent(nA)APFrequencyvsTemperature(Vcc=V,Io=mA,Vout=V)Temperature(TA)(C)Frequency(KHz)APFeedbackCurrentvsTemperature(Vcc=V,Vout=V,Vfb=V)Temperature(TA)(C)FeedbackCurrent(nA)APOutputVoltagevsTemperature(Vin=V,Io=A)Temperature(TA)(C)Vout(V)APKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„TypicalApplicationCircuit()FixedTypeCircuitVDCInputCinCapacitorFBSDDSchottkyDiodeVinGndOutputAPCoCapacitorInductorLuHVAOutputLoad()AdjustableTypeCircuitVDCInputCinCapacitorFBSDDSchottkyDiodeVinGndOutputAPCoCapacitorLuHVAOutputLoadRRVout=VFB(RR)VFB=VR=K~K()DelayStartCircuitVDCInputCinCapacitorFBSDDSchottkyDiodeVinGndOutputAPCoCapacitorLuHVAOutputLoadRRCDELAYuFKRDELAYAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„FunctionDescriptionPinFunctionsVINThisisthepositiveinputsupplyfortheICswitchingregulatorAsuitableinputbypasscapacitormustbepresentatthispintominimizevoltagetransientsandtosupplytheswitchingcurrentsneededbytheregulatorGroundCircuitgroundOutputInternalswitchThevoltageatthispinswitchesbetween(VIN–VSAT)andapproximately–V,withadutycycleofapproximatelyVOUTVINTominimizecouplingtosensitivecircuitry,thePCboardcopperareaconnectedtothispinshouldbekeptaminimumFeedback(FB)SensestheregulatedoutputvoltagetocompletethefeedbackloopONOFF(SD)AllowstheswitchingregulatorcircuittobeshutdownusinglogiclevelsignalsthusdroppingthetotalinputsupplycurrenttoapproximatelyuAPullingthispinbelowathresholdvoltageofapproximatelyVturnstheregulatoron,andpullingthispinaboveV(uptoamaximumofV)shutstheregulatordownIfthisshutdownfeatureisnotneeded,theONOFFpincanbewiredtothegroundpinThermalConsiderationsTheAPisavailableintwopackages:apinTOandapinsurfacemountTOTheTOpackageneedsaheatsinkundermostconditionsThesizeoftheheatsinkdependsontheinputvoltage,theoutputvoltage,theloadcurrentandtheambienttemperatureTheAPjunctiontemperaturerisesaboveambienttemperatureforaAloadanddifferentinputandoutputvoltagesThedataforthesecurveswastakenwiththeAP(TOpackage)operatingasabuckswitchingregulatorinanambienttemperatureofoC(stillair)ThesetemperaturerisenumbersareallapproximateandtherearemanyfactorsthatcanaffectthesetemperaturesHigherambienttemperaturesrequiremoreheatsinkingTheTOsurfacemountpackagetabwasdesignedtobesolderingtothecopperonaprintedcircuitboardThecopperandtheboardaretheheatsinkforthispackageandtheotherheatproducingcomponents,suchasthecatchdiodeandinductorThePCboardcopperareathatthepackageissolderedtoshouldbeatleastin,andideallyshouldhaveormoresquareinchesofozAdditionalcopperareaimprovesthethermalcharacteristics,butwithcopperareasgreaterthanapproximatelyin,onlysmallimprovementsinheatdissipationarerealizedIffurtherthermalimprovementsareneeded,doublesided,multilayerPCboardwithlargecopperareasandorairflowwillberecommendedTheAP(TOpackage)junctiontemperaturerisesaboveambienttemperaturewithaAloadforvariousinputandoutputvoltagesThisdatawastakenwiththecircuitoperatingasabuckswitchingregulatorwithallcomponentsmountedonaPCboardtosimulatethejunctiontemperatureunderactualoperatingconditionsThiscurvecanbeusedforaquickcheckfortheapproximatejunctiontemperatureforvariousconditions,butbeawarethattherearemanyfactorsthatcanaffectthejunctiontemperatureWhenloadcurrentshigherthanAareused,doublesidedormultilayerPCboardswithlargecopperareasandorairflowmightbeneeded,especiallyforhighambienttemperaturesandhighoutputvoltagesForthebestthermalperformance,widecoppertracesandgenerousamountsofprintedcircuitboardcoppershouldbeusedintheboardlayout(Onceexceptiontothisistheoutput(switch)pin,whichshouldnothavelargeareasofcopper)Largeareasofcopperprovidethebesttransferofheat(lowerthermalresistance)tothesurroundingair,andmovingairlowersthethermalresistanceevenfurtherAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„FunctionDescription(Continued)Packagethermalresistanceandjunctiontemperaturerisenumbersareallapproximate,andtherearemanyfactorsthatwillaffectthesenumbersSomeofthesefactorsincludeboardsize,shape,thickness,position,location,andevenboardtemperatureOtherfactorsare,tracewidth,totalprintedcircuitcopperarea,copperthickness,singleordoublesided,multilayerboardandtheamountofsolderontheboardTheeffectivenessofthePCboardtodissipateheatalsodependsonthesize,quantityandspacingofothercomponentsontheboard,aswellaswhetherthesurroundingairisstillormovingFurthermore,someofthesecomponentssuchasthecatchdiodewilladdheattothePCboardandtheheatcanvaryastheinputvoltagechangesFortheinductor,dependingonthephysicalsize,typeofcorematerialandtheDCresistance,itcouldeitheractasaheatsinktakingheatawayfromtheboard,oritcouldaddheattotheboard„MarkingInformation()TOLXXOutputType::ADJ:V:V:VLogoIDcodeYear:(Topview)""=""=YYWWXXXthweek:~~Blank:normalL:LeadFreePackage()TOLXXOutputType::ADJ:V:V:VLogoIDcodeYear:(Topview)""=""=YYWWXXXthweek:~~Blank:normalL:LeadFreePackageAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„PackageInformation()PackageType:TOLDQEbeAJFCΦPHLeDimensionsInMillimetersDimensionsInInchesSymbolMinNomMaxMinNomMaxAbCDEeeFHJLØpQAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„PackageInformation(Continued)()PackageType:TOLELeBDLACCLLandPatternRecommendation(Unit:mm)DimensionsInMillimetersDimensionsInInchesSymbolMinNomMaxMinNomMaxABCCDEeLLLAPKHz,APWMBuckDCDCConverterAnachipCorpwwwanachipcomtwRevOct,„PackageInformation(Continued)()PackageType:TOL(R)MechanicaldrawingEQDbAFHddJJJeHHAJJJEDimensionsInMillimetersDimensionsInInchesSymbolMinNomMaxMinNomMaxAbDddEeFHHHJJJQ

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