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XL1583.pdf

XL1583.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《XL1583pdf》,可适用于IT/计算机领域,主题内容包含DatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomFeatures„WideVtoVInputVo符等。

DatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomFeatures„WideVtoVInputVoltageRange„OutputAdjustablefromVtoV„MaximumDutyCycle„MinimumDropOutV„FixedKHzSwitchingFrequency„AConstantOutputCurrentCapability„InternalOptimizePowerMOSFET„Highefficiency„Excellentlineandloadregulation„TTLshutdowncapability„ENpinwithhysteresisfunction„Builtinthermalshutdownfunction„Builtincurrentlimitfunction„Builtinoutputshortprotectionfunction„AvailableinSOPpackageApplications„LCDMonitorandLCDTV„DigitalPhotoFrame„SetupBox„ADSLModem„TelecomNetworkingEquipmentGeneralDescriptionTheXLisaKHzfixedfrequencyPWMbuck(stepdown)DCDCconverter,capableofdrivingaAloadwithhighefficiency,lowrippleandexcellentlineandloadregulationRequiringaminimumnumberofexternalcomponents,theregulatorissimpletouseandincludeinternalfrequencycompensationandafixedfrequencyoscillatorThePWMcontrolcircuitisabletoadjustthedutyratiolinearlyfromtoAnenablefunction,anovercurrentprotectionfunctionisbuiltinsideWhenshortprotectionfunctionhappens,theoperationfrequencywillbereducedfromKHztoKHzAninternalcompensationblockisbuiltintominimizeexternalcomponentcountFigurePackageTypeofXLDatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomPinConfigurationsXLFBNCSWVINGNDNCENNCFigurePinConfigurationofXL(TopView)TablePinDescriptionPinNumberPinNameDescription,,NCNoConnectedVINSupplyVoltageInputPinXLoperatesfromaVtoVDCvoltageBypassVintoGNDwithasuitablylargecapacitortoeliminatenoiseontheinputSWPowerSwitchOutputPin(SW)OutputistheswitchnodethatsuppliespowertotheoutputGNDGroundPinCaremustbetakeninlayoutThispinshouldbeplacedoutsideoftheSchottkyDiodetooutputcapacitorgroundpathtopreventswitchingcurrentspikesfrominducingvoltagenoiseintoXLFBFeedbackPin(FB)Throughanexternalresistordividernetwork,FeedbacksensestheoutputvoltageandregulatesitThefeedbackthresholdvoltageisVENEnablePinDriveENpinlowtoturnoffthedevice,driveithightoturnitonFloatingisdefaulthighDatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomFunctionBlockFigureFunctionBlockDiagramofXLTypicalApplicationCircuitFigureXLTypicalApplicationCircuitVVADatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomOrderingInformationPartNumberMarkingIDLeadFreeLeadFreePackingTypeXLEXLETubePackageTemperatureRangeXLTREXLETapeReelXLSEMIPbfreeproducts,asdesignatedwith“E”suffixintheparnumber,areRoHScompliantAbsoluteMaximumRatings(Note)ParameterSymbolValueUnitInputVoltageVintoVFeedbackPinVoltageVFBtoVinVENPinVoltageVENtoVinVOutputSwitchPinVoltageVOutputtoVinVPowerDissipationPDInternallylimitedmWThermalResistance(SOP)(JunctiontoAmbient,NoHeatsink,FreeAir)RJAºCWOperatingJunctionTemperatureTJtoºCStorageTemperatureTSTGtoºCLeadTemperature(Soldering,sec)TLEADºCESD(HBM)VNote:StressesgreaterthanthoselistedunderMaximumRatingsmaycausepermanentdamagetothedeviceThisisastressratingonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsabovethoseindicatedintheoperationisnotimpliedExposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectreliabilityDatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomXLElectricalCharacteristicsTa=unlessotherwisespecifiedSymbolParameterTestConditionMinTypMaxUnitSystemparameterstestcircuitfigureVFBFeedbackVoltageVin=VtoV,Vout=VIload=AtoAVEfficiencyŋVin=V,Vout=VIout=AElectricalCharacteristics(DCParameters)Vin=V,GND=V,VinGNDparallelconnectaufVcapacitorIout=mA,Ta=theothersfloatingunlessotherwisespecifiedParametersSymbolTestConditionMinTypMaxUnitInputoperationvoltageVinVShutdownSupplyCurrentISTBYVEN=VuAQuiescentSupplyCurrentIqVEN=V,VFB=VinmAOscillatorFrequencyFoscKhzSwitchCurrentLimitILVFB=AENPinThresholdVENHigh(RegulatorON)Low(RegulatorOFF)VIHVEN=V(ON)uAENPinInputLeakageCurrentILVEN=V(OFF)uAMaxDutyCycleDMAXVFB=VDatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomTestCircuitandLayoutguidelinesFigureStandardTestCircuitsandLayoutGuidesSelectRtobeapproximatelyK,usearesistorforbeststabilityCandCFFareoptionalinordertoincreasestabilityandreducetheinputpowerlinenoise,CINandCmustbeplacedneartoVINandGNDForoutputvoltagesgreaterthanapproximatelyV,anadditionalcapacitorCFFisrequiredThecompensationcapacitoristypicallybetweenpfandnf,andiswiredinparallelwiththeoutputvoltagesettingresistor,RItprovidesadditionalstabilityforhighoutputvoltage,lowinputoutputvoltages,andorverylowESRoutputcapacitors,suchassolidtantalumcapacitorsCFF=(**R)Thiscapacitortypecanbeceramic,plastic,silvermica,etc(BecauseoftheunstablecharacteristicsofceramiccapacitorsmadewithZUmaterial,theyarenotrecommended)DatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomSchottkyDiodeSelectionTableCurrentSurfaceMountThroughHoleVR(Thesameassystemmaximuminputvoltage)VVVVVANNNNNNMBRMBRMBRMBRMBRSKSKSKSKSKWQWQWQDQDQDQASRSRSRSRSRDatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomTypicalSystemApplicationforV~VAVersionFigureXLSystemParametersTestCircuit(V~VA)TypicalSystemApplicationforV~VAFigureXLSystemParametersTestCircuit(V~VA)DatasheetAKHzVBuckDCtoDCConverterXLRevwwwxlsemicomPackageInformationSOPPackageMechanicalDimensions

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