OB2263资料下载.pdf

OB2263资料下载.pdf

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On-BrightElectronics-1-OB_DOC_DS_63B5OB2263CurrentModePWMControllerFrequencyShufflingGENERALDESCRIPTIONOB2263isahighlyintegratedcurrentmodePWMcontrolICoptimizedforhighperformance,lowstandbypowerandcosteffectiveofflineflybackconverterapplicationsinsub30Wrange.PWMswitchingfrequencyatnormaloperationisexternallyprogrammableandtrimmedtotightrange.Atnoloadorlightloadcondition,theICoperatesinextendedburstmodetominimizeswitchingloss.Lowerstandbypowerandhigherconversionefficiencyisthusachieved.VDDlowstartupcurrentandlowoperatingcurrentcontributetoareliablepoweronstartupdesignwithOB2263.Alargevalueresistorcouldthusbeusedinthestartupcircuittominimizethestandbypower.Theinternalslopecompensationimprovessystemlargesignalstabilityandreducesthepossiblesub-harmonicoscillationathighPWMdutycycleoutput.Leading-edgeblankingoncurrentsense（CS）inputremovesthesignalglitchduetosnubbercircuitdiodereverserecoveryandthusgreatlyreducestheexternalcomponentcountandsystemcostinthedesign.OB2263offerscompleteprotectioncoveragewithautomaticself-recoveryfeatureincludingCycle-by-Cyclecurrentlimiting（OCP）,overloadprotection（OLP）,VDDovervoltageclampandundervoltagelockout（UVLO）.TheGate-driveoutputisclampedtomaximum18VtoprotectthepowerMOSFET.ExcellentEMIperformanceisachievedwithOn-Brightproprietaryfrequencyshufflingtechniquetogetherwithsoftswitchingcontrolatthetotempolegatedriveoutput.Toneenergyatbelow20KHZisminimizedinthedesignandaudionoiseiseliminatedduringoperation.OB2263isofferedinSOT23-6,SOP-8andDIP-8packages.FEATURESOn-BrightProprietaryFrequencyShufflingTechnologyforImprovedEMIPerformance.ExtendedBurstModeControlForImprovedEfficiencyandMinimumStandbyPowerDesignAudioNoiseFreeOperationExternalProgrammablePWMSwitchingFrequencyInternalSynchronizedSlopeCompensationLowVDDStartupCurrentandLowOperatingCurrent（1.4mA）LeadingEdgeBlankingonCurrentSenseInputGoodProtectionCoverageWithAutoSelf-RecoveryoVDDOverVoltageClampandUnderVoltageLockoutwithHysteresis（UVLO）oGateOutputMaximumVoltageClamp（18V）oOn-BrightProprietaryLineInputCompensatedCycle-by-CycleOver-currentThresholdSettingForConstantOutputPowerLimitingOverUniversalInputVoltageRange.oOverloadProtection（OLP）APPLICATIONSOfflineAC/DCflybackconverterforBatteryChargerPowerAdaptorSet-TopBoxPowerSuppliesOpen-frameSMPSTYPICALAPPLICATIONConfidentialtoMicroBridgeOn-BrightElectronics-2-OB_DOC_DS_63B5OB2263CurrentModePWMControllerFrequencyShufflingGENERALINFORMATIONPinConfigurationTheOB2263isofferedinSOT23-6,DIP8andSOP8packages,shownasbelow.OrderingInformationPartNumberDescriptionOB2263MPSOT23-6,Pb-freeOB2263APDIP8,Pb-freeOB2263CPSOP8,Pb-freePackageDissipationRatingPackageRJA（C/W）DIP890SOP8150SOT23-6200AbsoluteMaximumRatingsParameterValueVDDDCSupplyVoltage30VVDDZenerClampVoltageNoteVDD_Clamp+0.1VVDDDCClampCurrent10mAVFBInputVoltage-0.3to7VVSENSEInputVoltagetoSensePin-0.3to7VVRIInputVoltagetoRIPin-0.3to7VMin/MaxOperatingJunctionTemperatureTJ-20to150oCMin/MaxStorageTemperatureTstg-55to160oCNote:

@#@VDD_Clamphasanominalvalueof34V.Stressesbeyondthoselistedunder“absolutemaximumratings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder“recommendedoperatingconditions”isnotimplied.Exposuretoabsolutemaximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.ConfidentialtoMicroBridgeOn-BrightElectronics-3-OB_DOC_DS_63B5OB2263CurrentModePWMControllerFrequencyShufflingMarkingInformationTERMINALASSIGNMENTSPinNameI/ODescriptionGNDPGroundFBIFeedbackinputpin.ThePWMdutycycleisdeterminedbyvoltagelevelintothispinandSENSEpininput.RIIInternalOscillatorfrequencysettingpin.AresistorconnectedbetweenRIandGNDsetsthePWMfrequency.SENSEICurrentsenseinputpin.ConnectedtoMOSFETcurrentsensingresistornode.VDDPChipDCpowersupplypin.GATEOTotem-polegatedriveoutputforthepowerMOSFET.RECOMMENDEDOPERATINGCONDITIONSymbolParameterMinMaxUnitVDDVDDSupplyVoltage10to30VRIRIResistorValue100KohmTAOperatingAmbientTemperature-20to85oCConfidentialtoMicroBridgeOn-BrightElectronics-4-OB_DOC_DS_63B5OB2263CurrentModePWMControllerFrequencyShufflingBLOCKDIAGRAMConfidentialtoMicroBridgeOn-BrightElectronics-5-OB_DOC_DS_63B5OB2263CurrentModePWMControllerFrequencyShufflingELECTRICALCHARACTERISTICS（TA=25OCifnototherwisenoted）SymbolParameterTestConditionsMinTypMaxUnitSupplyVoltage（VDD）I_VDD_StartupVDDStartupCurrentVDD=12.5V,RI=100KMeasure