开关电源IC OB2298_Data.pdf

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1、OB2298PWMControllerwithPFCStandbyControlGENERALDESCRIPTIONOB2298isahighlyintegratedcurrentmodePWMFEATUREScontrollerformediumtohighpowerofflineflyback■DirectControlofPFCconverterapplications.■ProgrammableBrownoutProtectionOB2298integratesPFCICpowersupplycontrol■Internal4msPowerOnSoftStartTimefunction

2、andshutsdownPFCstageatnoloadorlight■InternalRestartTimerloadconditions.■PinFloatingProtectionTomeettheincreasingstringentstandbypower■ProprietaryExtendedBurstModeControlForrequirementsinlightorzeroload,OB2298operatesImprovedEfficiencyandMinimumStandbyinOn-Bright’sproprietary“extendedburstmode”PowerD

3、esignwithoutaudionoise.Constantpowerlimitisachieved■Built-inFrequencyShufflingforBetterEMIbyOn-Bright’sproprietaryOCPcompensation■Built-inLeadingEdgeBlankingtechniquewhereOCPduetoCCMandDCMmode■ProprietaryOCPCompensationforUniversalACdifferenceiscompensatedinuniversalACinputInputRangeapplications.■Lo

4、wStartupCurrent(5uA)andLowOperatingOB2298offerscomprehensiveprotectioncoverageCurrent(2.3mA)includingCycle-by-Cyclecurrentlimiting,internal■Built-inSynchronizedSlopeCompensationPower-OnSoftStart,VDDUnderVoltageLockout■1.0APeakCurrentDrivingCapability(UVLO),VDDOverVoltageProtection(OVP),■AudioNoiseFr

5、eeOperationVDDClamp,GateClamp,OverLoadProtection■ConvenientHighandLowTriggeringLevel(OLP),OverTemperatureProtection(OTP),LatchOffFunctionProgrammableBrownoutProtection,AllPinsFloatingProtection,andRTLatchtriggeringfeature.APPLICATIONSInapplicationswhereVDDissuppliedbyauxiliaryOfflineAC/DCflybackconv

6、erterforpowersupply,thebuilt-in1secondrestarttimercan■LaptopPowerAdaptorpreventpermanentOLPlatch.Inotherapplications,■LCDMonitorPowerthisrestarttimerwillnotbetriggered.■LCDTVPowerandHomeAppliancePowerToachievegoodEMIperformance,On-Bright’s■PrinterPowerproprietarybuilt-infrequencyshufflingisprovided,

7、■LightingPoweralsowithsoftswitchingcontrolatthetotempolegatedriveoutput.OB2298isofferedinSOP-8andDIP-8packages.TYPICALAPPLICATION©On-BrightElectronicsConfidential-1-OB_DOC_DS_9800OB2298PWMControllerwi