昴宝OB2263PDF详细文档.pdf

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1、OB2263FrequencyShufflingCurrentModePWMControllerToneenergyatbelow20KHZisminimizedintheGENERALDESCRIPTIONdesignandaudionoiseiseliminatedduringoperation.OB2263isofferedinSOT23-6,SOP-8andDIP-8OB2263isahighlyintegratedcurrentmodePWMpackages.controlICoptimizedforhighperformance,lows

2、tandbypowerandcosteffectiveofflineflybackconverterapplicationsinsub30Wrange.FEATURESPWMswitchingfrequencyatnormaloperationis■On-BrightProprietaryFrequencyShufflingexternallyprogrammableandtrimmedtotightrange.TechnologyforImprovedEMIPerformance.Atnoloadorlightloadcondition,theIC

3、operatesin■ExtendedBurstModeControlForImprovedextended‘burstmode’tominimizeswitchingloss.EfficiencyandMinimumStandbyPowerDesignLowerstandbypowerandhigherconversion■AudioNoiseFreeOperationefficiencyisthusachieved.■ExternalProgrammablePWMSwitchingVDDlowstartupcurrentandlowoperati

4、ngcurrentFrequencycontributetoareliablepoweronstartupdesignwith■InternalSynchronizedSlopeCompensationOB2263.Alargevalueresistorcouldthusbeusedin■LowVDDStartupCurrentandLowOperatingthestartupcircuittominimizethestandbypower.Current(1.4mA)Theinternalslopecompensationimprovessyste

5、m■LeadingEdgeBlankingonCurrentSenseInputlargesignalstabilityandreducesthepossiblesub-■GoodProtectionCoverageWithAutoSelf-harmonicoscillationathighPWMdutycycleoutput.RecoveryLeading-edgeblankingoncurrentsense(CS)inputoVDDOverVoltageClampandUnderVoltageremovesthesignalglitchdueto

6、snubbercircuitdiodeLockoutwithHysteresis(UVLO)reverserecoveryandthusgreatlyreducestheexternaloGateOutputMaximumVoltageClamp(18V)componentcountandsystemcostinthedesign.oOn-BrightProprietaryLineInputCompensatedOB2263offerscompleteprotectioncoveragewithCycle-by-CycleOver-currentTh

7、resholdSettingautomaticself-recoveryfeatureincludingCycle-by-ForConstantOutputPowerLimitingOverCyclecurrentlimiting(OCP),overloadprotectionUniversalInputVoltageRange.(OLP),VDDovervoltageclampandundervoltageoOverloadProtection(OLP)lockout(UVLO).TheGate-driveoutputisclampedtomaxi

8、mum18VtoprotectthepowerMOSFET.APPLICATIONSExcellentEMI