BIT3260-datasheet-A1

BeyondInnovationTechnologyCo.,Ltd.
2012/02/06Confidentialpage1of7ThisisanONE-TIMEcopy.Updateswillnotbeprovided
HighPerformancePWMControllerVersion:A1BeyondInnovationTechnologyCo.,Ltd.
2012/02/06Confidentialpage2of7ThisisanONE-TIMEcopy.UpdateswillnotbeprovidedFeatures:PinLayout:
VoltageModePWMController
10V~18Voperationvoltage
Currentlimit
Frequencyadjustable
InternalSoft-Start
Maximumdutycycleoutput
Overtemperatureprotection,OTP
InternalUnderVoltageLockOut,UVLO
TotemPoleOutput
SOP-8Package12345678VDDEACMPINNOCPFREQGNDOUT12345678VDDEACMPINNOCPFREQGNDOUTGeneralDescription:RecommendedOperatingCondition:SupplyVoltage……………………….10V~18VOperatingFrequency…………….….100kHz~400KHzOperatingAmbientTemperature…...-20~85AbsoluteRatingsTheBIT3260isahighfrequencyPWMcontrollerintegratesrequiredfunctionsforboostconversioninasmallSOP-8package.Alow0.2VfeedbackvoltageandovercurrentprotectionmakeBIT3260beanidealcontrollerforLEDbacklightsupplies.Frequencyadjustableisflexibleinvariablesystemdesign.Internalsoftstartfunctioncanavoidinrushcurrenthappenedinthestartupperiod.OvertemperatureprotectionandUVLOmakesystemreliable.CMOSprocessgreatlyreducestheoperatingcurrentwhencomparingtosimilarproductsVDD…………………………...…………-0.3~+18VGND…………………..………….………±0.3VInputVoltage……………….…….……..-0.3~VDD+0.3VOperatingAmbitTemperature………….-20~85OperatingJunctionTemperature….….+150StorageTemperature……………..…….-55~150FunctionalDescription:DigitalcontrolcircuitTrianglewavegenerator+-+-0.5VOvertemperatureprotectionOCPCMP+-0.2VINNSoftstartFREQBufferOUTDigitalcontrolcircuitTrianglewavegenerator+-+-+-0.5VOvertemperatureprotectionOCPCMP+-0.2VINNSoftstartFREQBufferOUTBeyondInnovationTechnologyCo.,Ltd.
2012/02/06Confidentialpage3of7ThisisanONE-TIMEcopy.UpdateswillnotbeprovidedPinDescription:PinNo.SymbolDescriptions1VDDPowersupply2EAEnablepin3CMPOutputoftheerroramplifier4INNTheinvertinginputoftheerroramplifier5OCPOvercurrentprotection6FREQFrequencycontrol7GNDGroundpin8OUTOutputpinFunctionalDescription:UnderVoltageLockedOut,UVLO:TheUnder-voltagelockoutturns-offBIT3260iftheinputvoltagedropsbelowtheunder-voltagelockoutthreshold.Itturns-onBIT3260iftheinputvoltageishigherthanitsthreshold.Thehysteresisvoltageisabout100mV.Enablecontrol:TheEApincontrolsthestateofBIT3260.WhenEA2V,BIT3260isenabled.AndEA0.8V,BIT3260entersintoshutdownmodeoperation.ThePWMgenerator:Thepulsewidthmodulationcontrolcircuitincludesareferencevoltage,anerroramplifier,arampwavegenerator,andacomparator.AsignalinputtotheINNpiniscomparedwithreferencevoltageintheerroramplifier,therewillbeanerrorsignaloutputintheerroramplifier.ThiserrorsignalcanbemodulatedintoPWMsignalinthecomparatoroutputwhenitcomparestorampwavesignalinthecomparator.Frequencyadjustable:ToconnectaresistorhereintheFREQpincansetdifferentoutputfrequency.Theformulaisasfollowing:)(7023).(W=kRkHzFreqWhereRistheresistorconnectedinFREQpin.Internalsoft-startBuilt-insoft-startfunctioniscontrolledbyFREQpin.Toconnectanabout21kwillsetanabout12mssoftstarttime.Overcurrentprotection,OCP:Thepowerswitchwillpassthroughtoomanycurrentwhenabnormalconditionshappened.BIT3260willshutoffitsoutputiftheOCPpinsensesaovercurrentsignal.TheshutoffstatuscanberesetbyreducingthesignalinputtoOCP.OverTemperatureProtection,OTPBIT3260providesovertemperatureprotectionthatismorereliableforsystemprotection.Whentheoperationtemperatureistoohigh,BIT3260willshutoffitsoutput.Whenthetemperatureofthediedropsbelowthethreshold,recovered,BIT3260willautomaticallyrecovertoworkagain.BeyondInnovationTechnologyCo.,Ltd.
2012/02/06Confidentialpage4of7ThisisanONE-TIMEcopy.UpdateswillnotbeprovidedDC/ACCharacteristics:Ta=25unlessotherwisespecified.ParameterTestConditionsMin.Typ.Max.UnitSupplyvoltagesPinVDDinput1018VUndervoltagelookoutPositiveGoingThreshold9VHysteresis0.1VChipconsumedcurrentVDD=12Vsupplyvoltage2mAEnablecontrolONVDD=12V2VOFFVDD=12V0.8VErroramplifierreferencevoltageNon-InvertinginputoftheerroramplifierVDD=12V,measureINN0.2VOperatingfrequencyOperatingfrequencyrangeVDD=12V100400KHzFrequencyprecisionVDD=12V,FREQ=22k288320352KHzErroramplifierOpenloopgain80dBUnitgainbandwidthNote11MHzOvercurrentprotection,OCPOCPvoltageVDD=12V0.5VOvertemperatureprotection,OTPOvertemperatureprotection,OTPVDD=12V150hysteresisVDD=12V50SoftstartSoftstarttimeVDD=12V,FREQ=2212msOutputdriveRisingTime20nSFallingTimeVDD=12V,Cload=1000pF20nSNote1.Onlyguaranteedbysimulationorsampledevaluationduring–20~+85C.Not100%tested.BeyondInnovationTechnologyCo.,Ltd.
2012/02/06Confidentialpage5of7ThisisanONE-TIMEcopy.UpdateswillnotbeprovidedSolderingInformationReflowSoldering:ThechoiceofheatingmethodmaybeinfluencedbyplasticQFPpackage).Ifinfraredorvaporphaseheatingisusedandthepackageisnotabsolutelydry(lessthan0.1%moisturecontentbyweight),vaporizationofthesmallamountofmoistureinthemcancausecrackingoftheplasticbody.Preheatingisnecessarytodrythepasteandevaporatethebindingagent.Preheatingduration:45minutesat45°C.Reflowsolderingrequiressolderpaste(asuspensionoffinesolderparticles,fluxandbindinga