ME8202_中等功率控制芯片

ME8202V1.0‘burstmode’tominimizeswitchingloss.Lowerstandbypowerandhigherconversionefficiencyisthusachieved.VDDlowstartupcurrentandlowoperatingcurrentcontributetoareliablepoweronstartupdesignwithME8202.Alargevalueresistorcouldthusbeusedinthestartupcircuittominimizethestandbypower.TheinternalslopecompensationimprovessystemlargesignalstabilityandreducesthepossiblesubharmonicoscillationathighPWMdutycycleoutput.Leading-edgeblankingoncurrentsenseinputremovesthesignalglitchduetosnubbercircuitdiodereverserecoveryandthusgreatlyreducestheexternalcomponentcountandsystemcostinthedesign.ME8202offerscompleteprotectioncoveragewithautomaticself-recoveryfeatureincludingCycle-by-Cyclecurrentlimiting(OCP),overloadprotection(OLP),VDDovervoltageclampandundervoltagelockout(UVLO).TheGate-driveoutputisclampedat16VtoprotectthepowerMOSFET.InME8202,OCPthresholdslopeisinternallyoptimizedtoreachconstantoutputpowerlimitoveruniversalACinputrange.ExcellentEMIperformanceisachievedwithfrequencyshufflingtechniquetogetherwithsoftswitchingcontrolatthetotempolegatedriveoutput.Toneenergyatbelow20KHZisminimizedinthedesignandaudionoiseiseliminatedduringoperation.●ExtendedBurstModeControlForImprovedEfficiencyandMinimumStandbyPowerDesign●AudioNoiseFreeOperation●ExternalProgrammablePWMSwitchingFrequency●InternalSynchronizedSlopeCompensation●LowVDDStartupCurrent(3μA)andLowOperatingCurrent(1.8mA)★Externalprogrammableovertemperatureprotection(OTP)★WithorwithoutOn-chipVDDOVPforsystemOVP★UnderVoltageLockoutwithHysteresis(UVLO)★GateOutputMaximumVoltageClamp(16V)★LineInputCompensatedCycle-by-CycleOver-currentThresholdSettingForConstantOutputcurrentLimitingOverUniversalInputVoltageRange(OCP).★OverloadProtection(OLP)●AvailableinSOP8andDIP8packageTypicalApplicationOfflineAC/DCflybackconverterforBatteryChargerPC/TV/Set-TopBoxPowerSuppliesLaptopPowerAdaptorOpen-frameSMPSSelectionGuideME8202V1.0(VoltageatFB,SENSE,RI,RTtoGND)-0.3to7VMin/MaxOperatingJunctionTemperatureTJ-20to125°CMin/MaxStorageTemperatureTstg-55to150°CRθJAthermalResistanceSOP8150°C/WDIP890ME8202V1.0:VDD_Clamphasanominalvalueof35V.RecommendedOperatingConditionParameterRangeUnitVDDSupplyVoltage12to23VRIResistorValue24to31KΩTAOperatingAmbientTemperature-20to85°CESDInformationSymbolparameterTestconditonMin.Typ.Max.UnitHBMNoteHumanbodymodelonallpinsexceptVINandVDDMIL_STD-2.5-KVBlockDiagramME8202V1.0(TA=25°C,VDD=16V,RI=24KΩ,ifnototherwisenoted)SymbolParameterTestConditionsMinTyp.MaxUnitSupplyVoltage(VDD)IVDD_StartupVDDStartupCurrentVDD=15V,MeasurecurrentintoVDD-310μAIVDD_OperationOperationCurrentVFB=3V-1.8-mAUVLOONVDDUnderVoltageLockoutEnter9.510.511.5VUVLOOFFVDDUnderVoltageLockoutExit(Recovery)15.516.517.5VVDD_ClampVDDZenerClampVoltageIVDD=5mA-35-VOVPONVDDOvervoltageprotectionenter23.52526.5VOVPOFFVDDOvervoltageprotectionexit(recovery)21.52324.5VOVPHysOVPHysteresisOVPON-OVPOFF-2-VTD_OVPVDDOVPdebouncetime-80-μSFeedbackInputSection(FBPin)AVCSPWMInputGainΔVFB/ΔVCS-2.8-V/VVFB_OpenVFBOpenLoopVoltage-5.8-VIFB_ShortFBpinshortcircuitcurrentShortFBpintoGND,measurecurrent-0.8-mAVTH_0DZeroDutyCycleFBThresholdVoltage-0.95VVTH_BMBurstmodeFBthresholdvoltage-1.7-VVTH_PLPowerLimitingFBThresholdVoltage-4.4-VTD_PLPowerlimitingDebounceTime-80-mSZFB_INInputImpedance-7.2-KΩCurrentSenseInput(SensePin)T_blankingLeadingedgeblankingtime-250-nSZSENSE_INInputImpedance-30-KΩTD_OCOverCurrentDetectionandControlDelayCL=1nFatGATE-120-nSVTH_OC_0CurrentLimitingThresholdatNoCompensationIVIN=0μA0.800.90.95VVTH_OC_1CurrentLimitingThresholdatCompensationIVIN=150μA-0.81-VOscillatorFOSCNormalOscillationFrequency606570KHz∆f_TempFrequenc