SG3525-DataSheet

SEMICONDUCTORTECHNICALDATAPULSEWIDTHMODULATORCONTROLCIRCUITSPINCONNECTIONSOrderthisdocumentbySG3525A/DNSUFFIXPLASTICPACKAGECASE648161DWSUFFIXPLASTICPACKAGECASE751B(SO–16L)12345678910111213141516(TopView)Inv.InputSyncOSC.OutputRTDischargeSoft–StartNoninv.InputCTCompensationShutdownOutputAVCOutputBVCCVrefGroundDeviceOperatingTemperatureRangePackageORDERINGINFORMATIONSG3525ANSG3525ADWTA=0°to+70°CPlasticDIPSO–16LSG3527ANPlasticDIP1611MOTOROLAANALOGICDEVICEDATATheSG3525A,SG3527Apulsewidthmodulatorcontrolcircuitsofferimprovedperformanceandlowerexternalpartscountwhenimplementedforcontrollingalltypesofswitchingpowersupplies.Theon–chip+5.1Vreferenceistrimmedto±1%andtheerroramplifierhasaninputcommon–modevoltagerangethatincludesthereferencevoltage,thuseliminatingtheneedforexternaldividerresistors.Asyncinputtotheoscillatorenablesmultipleunitstobeslavedorasingleunittobesynchronizedtoanexternalsystemclock.AwiderangeofdeadtimecanbeprogrammedbyasingleresistorconnectedbetweentheCTandDischargepins.Thesedevicesalsofeaturebuilt–insoft–startcircuitry,requiringonlyanexternaltimingcapacitor.Ashutdownpincontrolsboththesoft–startcircuitryandtheoutputstages,providinginstantaneousturnoffthroughthePWMlatchwithpulsedshutdown,aswellassoft–startrecyclewithlongershutdowncommands.Theundervoltagelockoutinhibitstheoutputsandthechangingofthesoft–startcapacitorwhenVCCisbelownominal.Theoutputstagesaretotem–poledesigncapableofsinkingandsourcinginexcessof200mA.TheoutputstageoftheSG3525AfeaturesNORlogicresultinginalowoutputforanoff–statewhiletheSG3527AutilizedORlogicwhichgivesahighoutputwhenoff.•8.0Vto35VOperation•5.1V±1.0%TrimmedReference•100Hzto400kHzOscillatorRange•SeparateOscillatorSyncPin•AdjustableDeadtimeControl•InputUndervoltageLockout•LatchingPWMtoPreventMultiplePulses•Pulse–by–PulseShutdown•DualSource/SinkOutputs:±400mAPeakRepresentativeBlockDiagramNORNOR16151243657912810ReferenceRegulatorUnder–VoltageLockoutOscillatorLatchF/FQQ–PWMErrorAmp+–+–ToInternalCircuitryVREFVrefVCCGroundOSCOutputSyncRTCTDischargeCompensationINV.InputNoninv.InputCSoft–StartShutdown5.0kSRS50μAVC13OutputA1114OutputBSG3525AOutputStage13VCOutputA11OutputB14SG3527AOutputStageOROR5.0kMotorola,Inc.1996Rev2SG3525ASG3527A2MOTOROLAANALOGICDEVICEDATAMAXIMUMRATINGS(Note1)RatingSymbolValueUnitSupplyVoltageVCC+40VdcCollectorSupplyVoltageVC+40VdcLogicInputs–0.3to+5.5VAnalogInputs–0.3toVCCVOutputCurrent,SourceorSinkIO±500mAReferenceOutputCurrentIref50mAOscillatorChargingCurrent5.0mAPowerDissipation(Plastic&CeramicPackage)TA=+25°C(Note2)TC=+25°C(Note3)PD10002000mWThermalResistanceJunction–to–AirRθJA100°C/WThermalResistanceJunction–to–CaseRθJC60°C/WOperatingJunctionTemperatureTJ+150°CStorageTemperatureRangeTstg–55to+125°CLeadTemperature(Soldering,10seconds)TSolder+300°CNOTES:1.Valuesbeyondwhichdamagemayoccur.2.Derateat10mW/°Cforambienttemperaturesabove+50°C.3.Derateat16mW/°Cforcasetemperaturesabove+25°C.RECOMMENDEDOPERATINGCONDITIONSCharacteristicsSymbolMinMaxUnitSupplyVoltageVCC8.035VdcCollectorSupplyVoltageVC4.535VdcOutputSink/SourceCurrent(SteadyState)(Peak)IO00±100±400mAReferenceLoadCurrentIref020mAOscillatorFrequencyRangefosc0.1400kHzOscillatorTimingResistorRT2.0150kΩOscillatorTimingCapacitorCT0.0010.2μFDeadtimeResistorRangeRD0500ΩOperatingAmbientTemperatureRangeTA0+70°CAPPLICATIONINFORMATIONShutdownOptions(SeeBlockdiagram,frontpage)Sinceboththecompensationandsoft–startterminals(Pins9and8)havecurrentsourcepull–ups,eithercanreadilyacceptapull–downsignalwhichonlyhastosinkamaximumof100μAtoturnofftheoutputs.Thisissubjecttotheaddedrequirementofdischargingwhateverexternalcapacitancemaybeattachedtothesepins.AnalternateapproachistheuseoftheshutdowncircuitryofPin10whichhasbeenimprovedtoenhancetheavailableshutdownoptions.ActivatingthiscircuitbyapplyingapositivesignalonPin10performstwofunctions:thePWMlatchisimmediatelysetprovidingthefastestturn–offsignaltotheoutputs;anda150μAcurrentsinkbeginstodischargetheexternalsoft–startcapacitor.Iftheshutdowncommandisshort,thePWMsignalisterminatedwithoutsignificantdischargeofthesoft–startcapacitor,thus,allowing,forexample,aconvenientimplementationofpulse–by–pulsecurrentlimiting.HoldingPin10highforalongerduration,however,willultimatelydischargethisexternalcapacitor,recyclingslowturn–onuponrelease.Pin10shouldnotbeleftfloatingasnoisepickupcouldconceivablyinterruptnormaloperation.SG3525ASG3527A3MOTOROLAANALOGICDEVICEDATAELECTRICALCHARACTERISTICS(VCC=+20Vdc,TA=TlowtoThigh[Note4],unlessotherwisenoted.)CharacteristicsSymbolMinTypMaxUnitREFERENCESECTIONReferenceOutputVoltage(TJ=+25°C)Vref5.005.105.20VdcLineRegulation(+8.0V≤VCC≤+35V)Regline–1020mVLoadRegulation(0mA≤IL≤20mA)Regload–2050mVTemperatureStabilityΔVref/ΔT–20–mVTotalOutputVariationIncludesLineandLoadRegulationoverTemperatureΔVref4.95–5.25VdcShortCircuitCurrent(Vref=0V,TJ=+25°C)ISC–80100mAOutputNoiseVoltage(10Hz≤f≤10kHz,TJ=+25°C)Vn–40200μVrmsLongTermStability(TJ=+125°C)(Note5)S–2050mV/khrOSCILLATORSECTION(Note6,unlessotherwisenoted.)InitialAccuracy(TJ=