lm317 资料PDF

DCY(SOT-223)PACKAGE(TOPVIEW)INPUTOUTPUTADJUSTOUTPUTKTEPACKAGE(TOPVIEW)INPUTOUTPUTADJUSTOUTPUTKC(TO-220)PACKAGE(TOPVIEW)OUTPUTINPUTADJUSTOUTPUTKTT(TO-263)PACKAGE(TOPVIEW)INPUTOUTPUTADJUSTOUTPUTINPUTADJUSTOUTPUTKCS/KCT(TO-220)PACKAGE(TOPVIEW)OUTPUTLM317–SEPTEMBER1997–REVISEDFEBRUARY20133-TERMINALADJUSTABLEREGULATORCheckforSamples:LM3171FEATURES2•OutputVoltageRangeAdjustableFrom1.25V•ThermalOverloadProtectionto37V•OutputSafe-AreaCompensation•OutputCurrentGreaterThan1.5A•InternalShort-CircuitCurrentLimitingDESCRIPTION/ORDERINGINFORMATIONTheLM317isanadjustablethree-terminalpositive-voltageregulatorcapableofsupplyingmorethan1.5Aoveranoutput-voltagerangeof1.25Vto37V.Itisexceptionallyeasytouseandrequiresonlytwoexternalresistorstosettheoutputvoltage.Furthermore,bothlineandloadregulationarebetterthanstandardfixedregulators.Inadditiontohavinghigherperformancethanfixedregulators,thisdeviceincludeson-chipcurrentlimiting,thermaloverloadprotection,andsafeoperating-areaprotection.Alloverloadprotectionremainsfullyfunctional,eveniftheADJUSTterminalisdisconnected.TheLM317isversatileinitsapplications,includingusesinprogrammableoutputregulationandlocalon-cardregulation.Or,byconnectingafixedresistorbetweentheADJUSTandOUTPUTterminals,theLM317canfunctionasaprecisioncurrentregulator.Anoptionaloutputcapacitorcanbeaddedtoimprovetransientresponse.TheADJUSTterminalcanbebypassedtoachieveveryhighripple-rejectionratios,whicharedifficulttoachievewithstandardthree-terminalregulators.Table1.ORDERINGINFORMATION(1)TAPACKAGE(2)ORDERABLEPARTNUMBERTOP-SIDEMARKINGPowerFLEX™–KTEReelof2000LM317KTEROBSOLETETubeof80LM317DCYSOT-223–DCYL3Reelof2500LM317DCYR0°Cto125°CTO-220–KCTubeof50LM317KCOBSOLETETO-220,shortshoulder–KCSTubeof20LM317KCSLM317TO-220,shortshoulder–KCTTubeof20LM317KCTLM317TO-263–KTTReelof500LM317KTTRLM317(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteat(2)Packagedrawings,thermaldata,andsymbolizationareavailableat©1997–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.ADJUSTOUTPUTINPUTLM317SLVS044V–SEPTEMBER1997–REVISEDFEBRUARY2013(1)overvirtualjunctiontemperaturerange(unlessotherwisenoted)MINMAXUNITVI–VOInput-to-outputdifferentialvoltage40VTJOperatingvirtualjunctiontemperature150°CLeadtemperature1,6mm(1/16in)fromcasefor10s260°CTstgStoragetemperaturerange–65150°C(1)Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.PackageThermalData(1)PACKAGEBOARDθJAθJCθJP(2)PowerFLEX™(KTE)HighK,JESD51-523°C/W11.6°C/WSOT-223(DCY)HighK,JESD51-753°C/W30.6°C/WTO-220(KC/KCS/KCT)HighK,JESD51-519°C/W17°C/W3°C/WTO-263(KTT)HighK,JESD51-525.3°C/W18°C/W1.94°C/W(1)MaximumpowerdissipationisafunctionofTJ(max),θJA,andTA.ThemaximumallowablepowerdissipationatanyallowableambienttemperatureisPD=(TJ(max)–TA)/θJA.OperatingattheabsolutemaximumTJof150°Ccanaffectreliability.(2)Forpackageswithexposedthermalpads,suchasQFN,PowerPAD™,orPowerFLEX™,θJPisdefinedasthethermalresistancebetweenthediejunctionandthebottomoftheexposedpad.2SubmitDocumentationFeedbackCopyright©1997–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM317LM317–SEPTEMBER1997–REVISEDFEBRUARY2013RecommendedOperatingConditionsMINMAXUNITVI–VOInput-to-outputdifferentialvoltage340VIOOutputcurrent1.5ATJOperatingvirtualjunctiontemperature0125°CElectricalCharacteristicsoverrecommendedrangesofoperatingvirtualjunctiontemperature(unlessotherwisenoted)PARAMETERTESTCONDITIONS(1)MINTYPMAXUNITTJ=25°C0.010.04Lineregulation(2)VI–VO=3Vto40V%/VTJ=0°Cto125°C0.020.07VO≤5V25mVCADJ=10μF,(3)TJ=25°CVO≥5V0.10.5%VOLoadregulationIO=10mAto1500mAVO≤5V2070mVTJ=0°Cto125°CVO≥5V0.31.5%VOThermalregulation20-mspulse,TJ=25°C0.030.07%VO/WADJUSTterminalcurrent50100μAChangeinVI–VO=2.5Vto40V,PD≤20W,IO=10mAto1500mA0.25μAADJUSTterminalcurrentReferencevoltageVI–VO=3Vto40V,PD≤20W,IO=10mAto1500mA1.21.251.3VOutput-voltageTJ=0°Cto125°C0.7%VOtemperaturestabilityMinimumloadcurrentVI–VO=40V3.510mAtomaintainregulationVI–VO≤15V,PDPMAX(4)1.52.2MaximumoutputcurrentAVI–VO≤40V,PDPMAX(4),TJ=25°C0.150.4RMSoutputnoisevoltagef=10Hzto10kHz,TJ=25°C0.003%VO(%ofVO)CADJ=0μF(3)57RipplerejectionVO=10V,f=120HzdBCADJ=10μF(3)6264Long-termstabilityTJ=25°C0.31%/1khr(1)Unlessotherwisenoted,thefollow