OB2273-Datasheet

©On-BrightElectronicsConfidentialPreliminaryDatasheetOB_DOC_DS_227300-1-OB2273CurrentModePWMPowerSwitchFrequencyShufflingGENERALDESCRIPTIONBriardcombinesadedicatedcurrentmodePWMcontroller.Itisoptimizedforhighperformance,lowstandbypower(100mW),andcosteffectiveoff-lineflybackconverterapplicationsin40W~60Wrange.Briardofferscompleteprotectioncoveragewithautomaticself-recoveryfeatureincludingCycle-by-Cyclecurrentlimiting(OCP),CSshortprotection,CSfloatingprotection,overloadprotection(OLP),andVDDundervoltagelockout(UVLO)andlatchfeatureincludingovertemperatureprotection(OTP),overvoltage(fixedoradjustable)protection(OVP).ExcellentEMIperformanceisachievedwithOn-Brightproprietaryfrequencyshufflingtechniquetogetherwithsoftswitchingcontrolatthetotempolegatedriveoutput.Thetoneenergyatbelow20KHZisminimizedinthedesignandaudionoiseiseliminatedduringoperation.BriardisofferedinSOT23-6package.APPLICATIONSOfflineAC/DCflybackconverterfor■AC/DCadapter■PDApowersupplies■DigitalCamerasandCamcorderAdapter■VCR,SVR,STB,DVD&DVCDPlayerSMPS■Set-TopBoxPower■AuxiliaryPowerSupplyforPCandServer■Open-frameSMPSFEATURES■PoweronSoftStartReducingMOSFETVdsStress■FrequencyshufflingforEMI■ExtendedBurstModeControlForImprovedEfficiencyandMinimumStandbyPowerDesign■AudioNoiseFreeOperation■Fixed65KHZSwitchingFrequency■InternalSynchronizedSlopeCompensation■LeadingEdgeBlankingonCurrentSenseInput■GoodProtectionCoverageWithAutoSelf-RecoveryoVDDUnderVoltageLockoutwithHysteresis(UVLO)oOverTemperatureProtection(OTP)withlatchoCycle-by-cycleovercurrentthresholdsettingforconstantoutputpowerlimitingoveruniversalinputvoltagerangeoOverloadProtection(OLP)withauto-recoveryoOvervoltageProtection(OVP)withlatchoAdjustableOVPthroughexternalZeneroCSfloatingprotectionwithauto-recoveryoCSshortprotectionwithauto-recoveryTYPICALAPPLICATIONProductSpecificationInternalReference©On-BrightElectronicsConfidentialPreliminaryDatasheetOB_DOC_DS_227300-2-OB2273CurrentModePWMPowerSwitchFrequencyShufflingGENERALINFORMATIONPinConfigurationTheOB2273isofferedinSOT23-6package,shownasbelow.OrderingInformationPartNumberDescriptionOB2273MPSOT23-6,Pb-freeinT&RPackageDissipationRatingPackageRθJA(℃/W)SOT23-6200AbsoluteMaximumRatingsParameterValueVDDDCSupplyVoltage40VVDDZenerClampVoltageNoteVDD_Clamp+0.1VVDDDCClampCurrent10mAFBInputVoltage-0.3to7VSenseInputVoltage-0.3to7VRTInputVoltage-0.3to7VMin/MaxOperatingJunctionTemperatureTJ-20to150oCMin/MaxStorageTemperatureTstg-55to160oCNote:VDD_Clamphasanominalvalueof32V.Stressesbeyondthoselistedunder“absolutemaximumratings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder“recommendedoperatingconditions”isnotimplied.Exposuretoabsolutemaximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.InternalReference©On-BrightElectronicsConfidentialPreliminaryDatasheetOB_DOC_DS_227300-3-OB2273CurrentModePWMPowerSwitchFrequencyShufflingMarkingInformationTERMINALASSIGNMENTSForSOT23-6PinNameI/ODescriptionGNDPGroundFBIFeedbackinputpin.ThePWMdutycycleisdeterminedbyvoltagelevelintothispinandthecurrent-sensesignalatPin3.RTIDualfunctionpin.EitherconnectedthroughaNTCresistortogroundforovertemperatureshutdown/latchcontrolorconnectedthroughZenertoVDDforadjustableovervoltageprotectionCSICurrentsenseinputVDDPPowerSupplyGateOTotem-polegatedriveroutputforpowerMosfetRECOMMENDEDOPERATINGCONDITIONSymbolParameterMin/MaxUnitVDDVDDSupplyVoltage10to30VTAOperatingAmbientTemperature-20to85℃C:OptionalInternalCodeInternalReference©On-BrightElectronicsConfidentialPreliminaryDatasheetOB_DOC_DS_227300-4-OB2273CurrentModePWMPowerSwitchFrequencyShufflingBLOCKDIAGRAMInternalReference©On-BrightElectronicsConfidentialPreliminaryDatasheetOB_DOC_DS_227300-5-OB2273CurrentModePWMPowerSwitchFrequencyShufflingELECTRICALCHARACTERISTICS(TA=25℃,VDD=16V,unlessotherwisenoted)SymbolParameterTestConditionsMinTypMaxUnitSupplyVoltage(VDD)IstartupVDDStartupCurrentVDD=11V,MeasureLeakagecurrentintoVDD520uAI_VDD_OperationOperationCurrentVFB=3V1.82.5mAUVLO(ON)VDDUnderVoltageLockoutEnter678VUVLO(OFF)VDDUnderVoltageLockoutExit(Recovery)12.513.514.5VVpull-upPull-upPMOSactive13VVdd_clampIvdd=10mA303234VOVP(ON)OvervoltageprotectionvoltageCS=0V,FB=3VRampupVDDuntilgateclockisoff242628VVlatch_releaseLatchreleasevoltage5VFeedbackInputSection(FBPin)VFB_OpenVFBOpenLoopVoltage3.94.2VAvcsPWMinputgainΔVFB/ΔVCS2V/VMaximumdutycycleMaxdutycycle@VDD=14V,VFB=3V,VCS=0V758085%Vref_greenThethresholdentergreenmode1.4VVref_burst_HThethresholdexitburstmode0.675VVref_burst_LThethresholdenterburstmode0.575VIFB_ShortFBpinshortcircuitcurrentShortFBpintoGNDandmeasurecurrent0.3mAVTH_PLPowerLimitingFBThresholdVoltage3.7VTD_PLPowerlimitingDebounceTime808896mSecZFB_INInputImpedance4KohmCurrentSenseInput(SensePin)Softstarttime4msT_blankingLeadingedgeblankingtime220nsZSENSE_INInputImpedance40KohmTD_OCOverCurrentDetectionandControlDelayFromOverCurrentOccurstilltheGatedriveoutputstarttoturnoff120nSecVTH_OCInternalCurrentLimitingThresholdVoltageFB=3.3V0.75