开关电源控制芯片M51995资料

SWITCHINGREGULATORCONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27)PINCONFIGURATION(TOPVIEW)DESCRIPTIONM51995AistheprimaryswitchingregulatorcontrollerwhichisespeciallydesignedtogettheregulatedDCvoltagefromACpowersupply.ThisICcandirectlydrivetheMOS-FETwithfastriseandfastfalloutputpulse.TypeM51995AhasthefunctionsofnotonlyhighfrequencyOSCandfastoutputdrivebutalsocurrentlimitwithfastresponseandhighsensibilitysothetruefastswitchingregulatorcanberealized.Ithasanotherbigfeatureofcurrentprotectiontoshortandovercurrent,owingtotheintegratedtimer-typeprotectioncircuit,iffewpartsareaddedtotheprimaryside.TheM51995AisequivalenttotheM51977withexternallyre-settableOVP(overvoltageprotection)circuit.FEATURES500kHzoperationtoMOSFET•Outputcurrent...............................................................±2A•Outputrisetime60ns,falltime40ns•ModifiedtotempoleoutputmethodwithsmallthroughcurrentCompactandlight-weightpowersupply•Smallstart-upcurrent............................................90µAtyp.•Bigdifferencebetweenstart-upvoltageandstopvoltagemakesthesmoothingcapacitorofthepowerinputsectionsmall.Start-upthreshold16V,stopvoltage10V•Packageswithhighpowerdissipationareusedtowith-standtheheatgeneratedbythegate-drivecurrentofMOSFET.16-pinDIP,20-pinSOP1.5W(at25°C)Simplifiedperipheralcircuitwithprotectioncircuitandbuilt-inlarge-capacitytotempoleoutput•High-speedcurrentlimitingcircuitusingpulse-by-pulsemethod(TwosystemofCLM+pin,CLM-pin)•Protectionbyintermittentoperationofoutputovercurrent................................................................Timerprotectioncircuit•Over-voltageprotectioncircuitwithanexternallyre-settablelatch(OVP)•Protectioncircuitforoutputmissactionatlowsupplyvoltage(UVLO)High-performanceandhighlyfunctionalpowersupply•TriangularwaveoscillatorforeasydeadtimesettingAPPLICATIONFeedforwardregulator,fly-backregulator1161314151432125116107982017181914321651561471381291110RECOMMENDEDOPERATINGCONDITIONSSupplyvoltagerange............................................12to36VOperatingfrequency.................................lessthan500kHzOscillatorfrequencysettingresistance•T-ONpinresistanceRON...........................10kto75kΩ•T-OFFpinresistanceROFF..........................2kto30kΩCOLLECTORVOUTEMITTERVFON/OFFOVPDETF/BOutline16P4Outline20P2N-AVccCLM+CLM-GNDCTT-OFFCFT-ONCOLLECTORVOUTEMITTERVFON/OFFOVPDETF/BVccCLM+CLM-GNDCTT-OFFCFT-ONHEATSINKPINHEATSINKPINConnecttheheatsinkpintoGND.SWITCHINGREGULATORCONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27)BLOCKDIAGRAMCLM--CURRENTLIMITF/BCOLLECTOREMITTERVOLTAGEREGULATORVVA3636±2±0.15VccVcc-4.0to+4.0SymbolRatingsUnitParameterConditionsABSOLUTEMAXIMUMRATINGSVCCSupplyvoltageCollectorvoltageOutputcurrentVFterminalvoltageON/OFFterminalvoltageCLM-terminalvoltageVCIOVVFVVmAmW/˚C-0.3to+4.08650~10-1-2CLM+terminalvoltageOVPterminalcurrentDETterminalvoltagePowerdissipationThermalderatingfactorOperatingtemperatureStoragetemperaturePdKToprTstgW˚C1.512-30to+85-40to+125150Ta=25˚CTa25˚CTjJunctiontemperaturePeakContinuous2VON/OFFVCLM-VCLM+IOVPVDETIDETVFBITONITOFFDETterminalinputcurrentF/BterminalvoltageT-ONterminalinputcurrentT-OFFterminalinputcurrent˚C˚CmAmAVmAVVVNote1.+signshowsthedirectionofcurrentflowintotheICand-signshowsthecurrentflowfromtheIC.2.Thisterminalhastheconstantvoltagecharacteristicof6to8V,whencurrentissuppliedfromoutside.Themaximumallowablevoltageis6Vwhentheconstantvoltageisappliedtothisterminal.Andmaximumallowablecurrentintothisterminalis5mA.3.ThelowimpedancevoltagesupplyshouldnotbeappliedtotheOVPterminal.VCCDETGNDUNDERVOLTAGELOCKOUTVOUT2.5VOPAMPPWMLATCHPWMCOMPARATORINTERMITTENTACTIONINTERMITTENTACTIONANDOSCCONTROL-CURRENTLIMITLATCH+CURRENTLIMITLATCHOSCILLATOR(TRIANGLE)CLM++CURRENTLIMITCTINTERMITTENTOPERATIONDETERMINECAPACITANCELATCH5006S1S3K1S1S15.2K7.1V5.8VON/OFFOVP(shutdown)OSCILLATORCAPACITANCECFOSCILLATORRESISTANCET-ON(ONduty)OSCILLATORRESISTANCET-OFF(OFFduty)VFSWITCHINGREGULATORCONTROLM51995AP/FPMITSUBISHI(Dig./Ana.INTERFACE)(/27)ΔVcc=Vcc(START)-Vcc(STOP)OperationstopvoltageStand-bycurrentOperatingsupplyvoltagerangeOperatingcircuitcurrentCircuitcurrentinOFFstateON/OFFterminalhighthresholdvoltageCurrentat0%dutyLimitsMin.Typ.Max.SymbolTestconditionsUnitParameterELECTRICALCHARACTERISTICS(VCC=18V,Ta=25°C,unlessotherwisenoted)VVcc(STOP)35BlockVCC(START)VCCVTHHON/OFFVTHLON/OFFΔVTHON/OFFIFBMIND16.217.2V9.09.910.96.37.690mAµAVVVΩVdBµAµAVTerminalvoltageTerminalresistanceDifferencesupplyvoltagebetweenoperationstopandOVPresetDetectionvoltageInputcurrentofdetectionampVoltagegainofdetectionampOVPterminalhysteresisvoltageOVPresetsupplyvoltageΔIFBVFBRFBVCC(STOP)-VCCOVPCVDETIINDETGAVDETVTHOVPHΔVTHOVPITHOVPIINOVPVCCOVPCOperationstartupvoltage3TimerfrequencyCurrentfromOVPterminalforOVPresetTimerchargecurrentOFFtime/ONtimeratioITHOVPCfTIMERITIMECHTIMEOFF/ONHzµAmVmVnsCLM-terminalthresholdvoltageVTHCLM-IINCLM-TPDCLM-VTHCLM+IINCLM+TPDCLM+VCC(STOP)ΔVccIccLIccOIccOFFIccCTIccOVPIFBMAXDDifferencevoltagebetweenoperationstartandstopCircuitcurrentintimerOFFstateCircuitcurrentinOVPstateON