BIT3367-datasheet-A1

BeyondInnovationTechnologyCo.,Ltd.BIT33672013/12/23Confidentialpage1of9ThisisanONE-TIMEcopy.UpdateswillnotbeprovidedBIT3367HighPerformancePWMControllerVersion:A1Pleasereadthenoticestatedinthispreamblecarefullybeforeaccessinganycontentsofthedocumentattached.AdmissionofBiTEK’sstatementthereinispresumedoncethedocumentisreleasedtothereceiver.BeyondInnovationTechnologyCo.,Ltd.BIT33672013/12/23Confidentialpage2of9ThisisanONE-TIMEcopy.UpdateswillnotbeprovidedNotice:Firstly,theinformationfurnishedbyBeyondInnovationTechnologyCo.Ltd.(BiTEK)inthisdocumentisbelievedtobeaccurateandreliableandsubjecttoBiTEK’samendmentwithoutpriornotice.AndtheaforesaidinformationdoesnotformanypartorpartsofanyquotationorcontractbetweenBiTEKandtheinformationreceiver.Further,noresponsibilityisassumedfortheusageoftheaforesaidinformation.BiTEKmakesnorepresentationthattheinterconnectofitscircuitsasdescribedhereinwillnotinfringeonexitingorfuturepatentrights,nordothedescriptionscontainedhereinimplythegrantingoflicensestomake,useorsellequipmentconstructedinaccordancetherewith.Besides,theproductinthisdocumentisnotdesignedforuseinlifesupportappliances,devices,orsystemswheremalfunctionofthisproductcanreasonablybeexpectedtoresultinpersonalinjury.BiTEKcustomers’usingorsellingthisproductforuseinsuchapplicationsshalldosoattheirownriskandagreetofullyindemnifyBiTEKforanydamageresultingfromsuchimproperuseorsale.Atlast,theinformationfurnishedinthisdocumentisthepropertyofBiTEKandshallbetreatedashighlyconfidentiality;anykindofdistribution,disclosure,copying,transformationoruseofwholeorpartsofthisdocumentwithoutdulyauthorizationfromBiTEKbypriorwrittenconsentisstrictlyprohibited.ThereceivershallfullycompensateBiTEKwithoutanyreservationforanylossesthereofduetoitsviolationofBiTEK’sconfidentialrequest.ThereceiverisdeemedtoagreeonBiTEK’sconfidentialrequestthereinsupposethatsaidreceiverreceivesthisdocumentwithoutmakinganyexpresslyopposition.Intheconditionthataforesaidoppositionismade,thereceivershallreturnthisdocumenttoBiTEKimmediatelywithoutanydelay.BeyondInnovationTechnologyCo.,Ltd.BIT33672013/12/23Confidentialpage3of9ThisisanONE-TIMEcopy.UpdateswillnotbeprovidedFeatures:PinLayout:Currentmodecontrolandfixedfrequencyoperation8V~18VoperationvoltageInternalminimumofftimeOvercurrentprotection,OCPOvervoltageprotection,OVPInternalSoft-StartOvertemperatureprotection,OTPInternalundervoltagelockout,UVLOTotempoleoutputSOP-8packageGeneralDescription:RecommendedOperatingCondition:TheBIT3367isacurrentmodecontrolandfixedfrequencyoperationPWMcontrollerofDC-DCconverter.Alow0.21Vfeedbackvoltage,overvoltageprotectionandovercurrentprotectionmakeBIT3367beenanidealcontrollerforLEDbacklightsupplies.Internalsoftstartfunctioncanavoidinrushcurrenthappenedinthestart-upperiod.AdditionalovertemperatureprotectionandUVLOmakesystemreliable.CMOSprocessgreatlyreducestheoperatingcurrentwhencomparingtosimilarproductsSupplyvoltage……………………….8V~18VOperatingfrequency……………….110kHzOperatingambienttemperature…...-20℃~85℃AbsoluteratingsVDD…………………………...…………-0.3~+18VGND…………………..………….………±0.3VInputvoltage……………….…….……..-0.3~VDD+0.3VOperatingambienttemperature……...-20~85℃Operatingjunctiontemperature….….+150℃Storagetemperature……………..…….-55~150℃Functionalblockdiagram:12345678CMPVDDGND12345678INNEAOVPOCPOUTOCPDigitalcontrolcircuitCMP0.21VINNBufferEA+-2VOVPΣDigitalcontrolcircuit+-CMP0.21VINNSoftstartSoftstartOUTEA-0.3V+0.3V+-+-2VOVPUVLOInternalbias&ReferenceOTPVDD+-+-EAPWMcomparatorOscillatorLeadingedgeblankingOCPcomparatorDimmingcontrolLSPprotectionBeyondInnovationTechnologyCo.,Ltd.BIT33672013/12/23Confidentialpage4of9ThisisanONE-TIMEcopy.UpdateswillnotbeprovidedPindescription:PinNo.SymbolDescriptions1CMPOutputoftheerroramplifier2INNTheinvertinginputoftheerroramplifier3EAEnableanddimminginput4VDDPowersupply5OVPOvervoltageprotection6GNDGroundpin7OCPOvercurrentprotection8OUTOutputpinFunctionalDescription:UnderVoltageLockedOut,UVLO:Toavoidtheabnormalconditionhappenedwhentheinputvoltagedropstolowvoltage,itisneededtosetalowvoltageoperationpoint.Belowthelowvoltageoperationpoint,theundervoltagelockout(UVLO)ofBIT3367willturn-offitsoutputandmostofinternalfunctions.Therecoveryhysteresisvoltageisabout1V.Asshowninfollowingfigure.CurrentmodecontrolandslopecompensationFortheBoostconverteroperation,peakcurrentmodecontrolspowerswitchaccordinginductorcurrent.Itdetectstherisinginductorcurrentandturnsoffpowerswitchwhentheinductorcurrentreachesthecontrollevel.Itsadvantageisfastresponseonlineandloadregulationandeasilybeencompensatedforstabilityrequirement.Whenthedutycycleoftheconstantfrequencyoperationislargerthan50%,thecircuitwillbecomeunstableandresultsub-harmonicoscillation.Forthesub-harmonicoscillationhappenedinthecurrentmodecontrolwhenoperatedatfixedfrequency,BIT3367built-inslopecompensationtosolvethisproblem.RealtimeOCPandleadingedgeblankingFortheturnonofpowerswitch,thecurrentspikewillbehappenedintherisingedge.Theleadingedgeblanking(LEB)UVLOthysteresisSwitchcurrentSwitchcontrolsignalLEBtimeControlpointSwitchcurrentSwitch