KA3842_DataSheet.pdf
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KA3842_DataSheet.pdf

KA3842_DataSheet.pdf

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CURRENT-MODEPWMCONTROLLERTheKA3842Aarefixefrequencycurrent-modePWMcontroller.TheyarespeciallydesignedforOFF-LineandDC-to-DCconverterapplicationswithminimalexternalcomponents.Theseintegratedcircuitsfeatureatrimmedoscillatorforprecisedutycyclecontrol,atemperaturecompensatedreference,highgainerroramplifier,currentsensingcomparator,andahighcurrenttotempoleoutputideallysuitedfordrivingapowerMOSFET.Protectioncircuityincludesbuiltunder-voltagelockoutandcurrentlimiting.TheTheKA3842A,KA384AMcanTheKA3842AhaveStart-UpCurrent0,45mAFEATURESordering·LowStart-UpCurrentinformation·MaximumDutyCycleDevicePackageOperatingtemperature·U/VLockoutWithHysteresisKA3842AMSO-80to+700C·OperatingFreguencyUpTo500khzBLOCKDIAGRAMAbsoluteMaximumRatingsCharacteristicSymbolValueUnitSupplyVoltageVCC30VOutputCurrentIO±1AAnalogInputsVI-0.3toVCCVErrorAmpOutputSinkCurrentISINK(E.A)10mA0PowerDissipation(TA=25C)PO1WWingShingComputerComponentsCo.,(H.K.)Ltd.Tel:(852)23419276Fax:(852)27978153Homepage:http://www.wingshing.comE-mail:wsccltd@hkstar.com00Electricalcharacteristics(*VCC=15V,RT=10kWW,CT=3.3nF,TA=0Cto+70C,unlessotherwisespecified)CharacteristicsSymbolTestConditionMinTypMaxUnitReferenceSectionReferenceOutputVoltegeVREFTJ=25°C,IREF=1mA4.95.05.1VLineRegulationDVREF12V£VCC£25V6.020mVLoadRegulationDVREF1mA£IREF£20mA6.025ShortCircitOutputCurrentISCTA=25°C-100-180mAOscillatorSectionOscillationFreguencyfTJ=25°C475257KHzFrequencyChangewithDf/DVCCF12V£VCC£25V0.051.0%VoltageOscillatorAmplitudeV(OSC)1.6Vp-pErrorAmplifierSectionInputBiasCurrentIBIAS-0.1-2mAInputVoltageVI(E.A)V1=2.5V2.422.52.58VOpenLoopVoltageGainGVO2V£V0£4V6590dBPowerSupplyRejectionRatioPSRR12V£VCC£25V6070OutputSinkCurrentISINKV2=2.7V,V1=1.1V27mAOutputSourceCurrentISOURCEV2=2.3V,V1=5V-0.5-1.0mAHighOutputVoltageVOHV2=2.3V,RL=15KWtoGND5.06.0VLowOutputVoltageVOLV2=2.7V,RL=15KWtoPIN80.81.1CurrentSenseSectionGainGV(Note1&2)2.853.03.15V/VMaximumInputSignalVI(MAX)V1=5V(Note1)0.9