SA8281三相PWM发生器

TheSA828PWMgeneratorhasbeendesignedtoprovidewaveformsforthecontrolofvariablespeedACmachines,uninterruptiblepowersuppliesandotherformsofpowerelectronicdeviceswhichrequirepulsewidthmodulationasameansofefficientpowercontrol.ThesixTTLlevelPWMoutputs(Fig.2)controlthesixswitchesinathree-phaseinverterbridge.Thisisusuallyviaanexternalisolationandamplificationstage.TheSA828isfabricatedinCMOSforlowpowerconsumption.Informationcontainedwithinthepulsewidthmodulatedsequencescontrolstheshape,powerfrequency,amplitude,androtationaldirection(asdefinedbythered-yellow-bluephasesequence)oftheoutputwaveform.Parameterssuchasthecarrierfrequency,minimumpulsewidth,andpulsedelaytimemaybedefinedduringtheinitialisationofthedevice.Thepulsedelaytime(underlap)controlsthedelaybetweenturningonandoffthetwopowerswitchesineachoutputphaseoftheinverterbridge,inordertoaccommodatevariationsintheturn-onandturn-offtimesoffamiliesofpowerdevices.TheSA828iseasilycontrolledbyamicroprocessoranditsfully-digitalgenerationofPWMwaveformsgivesunprecedentedaccuracyandtemperaturestability.Precisionpulseshapingcapabilityallowsoptimumefficiencywithanypowercircuitry.Thedeviceoperatesasastand-alonemicroprocessorperipheral,readingthepowerwaveformdirectlyfromaninternalROMandrequiringmicroprocessorinterventiononlywhenoperatingparametersneedtobechanged.An8-bitmultiplexeddatabusisusedtoreceiveaddressesanddatafromthemicroprocessor/controller.ThisisastandardMOTELTMbus,compatiblewithmostmicroprocessors/controllers.Rotationalfrequencyisdefinedto12bitsforhighaccuracyandazerosettingisincludedinordertoimplementDCinjectionbrakingwithnosoftwareoverhead.ThisfamilyispinandfunctionallycompatiblewiththeMA828PWMgenerator.Twostandardwaveshapesareavailabletocovermostapplications.Inaddition,anysymmetricalwaveshapecanbeintegratedon-chiptoorder.FEATURESnFullyDigitalOperationnInterfaceswithMostMicroprocessorsnWidePower-FrequencyRangen12-BitSpeedControlAccuracynCarrierFrequencySelectableupto24kHznWaveformStoredinInternalROMnDoubleEdgedRegularSamplingnSelectableMinimumPulseWidthandUnderlapTimenDCInjectionBrakingDP28MP28Fig.1Pinconnections–topview(nottoscale)MOTELisaregisteredTrademarkofIntelCorp.andMotorolaCorp.AD2AD1AD0VDDZPPBZPPYZPPRWSSRPHTSETTRIPYPHTBPHTVSSBPHBAD3AD4AD5AD6AD7WR*(R/W†)RD*(DS†)ALE*(AS†)RSTCLKCSTRIPRPHBYPHB*=Intelbusformat†=Motorolabusformat12345678910111213142827262524232221201918171615SA828SA82812345678910111213142827262524232221201918171615AD2AD1AD0VDDZPPBZPPYZPPRWSSRPHTSETTRIPYPHTBPHTVSSBPHBAD3AD4AD5AD6AD7WR*(R/W†)RD*(DS†)ALE*(AS†)RSTCLKCSTRIPRPHBYPHBORDERINGINFORMATIONSA8281/IG/DP1S(28-leadDIL,sine+thirdharmonicwaveform)SA8282/IG/DP1S(28-leadDIL,sinewaveform)SA8281/IG/MP1S(28-leadSOIC,Sine+thirdharmonicwaveform)SA8382/IG/MP1S(28-leadSOIC,sinewaveform)SA828FamilyThree-PhasePWMWaveformGeneratorDS4226-2.0November1996SA82824·50·2105·0InputhighvoltageInputlowvoltageInputleakagecurrentOutputhighvoltageOutputlowvoltageSupplycurrent(static)Supplycurrent(dynamic)SupplyvoltageVIN=VSSorVDDIOH=–12mAIOL=12mAAlloutputsopencircuitfCLK=10MHzVIHVILIINVOHVOLIDD(static)IDD(dynamic)VDD24·04·50·8100·4100205·5Typ.Max.Min.ValueCharacteristicSymbolConditionsUnitsELECTRICALCHARACTERISTICSThesecharacteristicsareguaranteedoverthefollowingconditions(unlessotherwisestated):VDD=+5V±5%,TAMB=+25°CDCCharacteristicsVVμAVVμAmAV-2/fCLK2/fCLKClockfrequencyClockdutycycleSETTRIP=1→outputstripped→TRIP=0M:Sratio=1:1±20%fCLKinMHzfCLKinMHzfCLKDCLKtTRIP12·5603/fCLK3/fCLKMHz%μsμsNOTE1.Formicroprocessorinterfacetimings,seeIntelandMotorolabustimings(Tables1and2).ConditionsTyp.Max.CharacteristicSymbolUnitsValueACCharacteristicsABSOLUTEMAXIMUMRATINGSSupplyvoltage,VDDVoltageonanypinCurrentthroughanyI/OpinStoragetemperatureOperatingtemperaturerangePinNo.123456789101112NameAD3AD4AD5AD6AD7Intel:WRMotorola:R/WIntel:RDMotorola:DSIntel:ALEMotorola:ASRSTCLKCSTRIPTypeIIIIIIIIIIIOFunctionMultiplexedAddress/DataMultiplexedAddress/DataMultiplexedAddress/DataMultiplexedAddress/DataMultiplexedAddress/Data(MSB)Intelbuscontrol:WriteStrobeMotorolabuscontrol:Read/WriteselectIntelbuscontrol:ReadStrobeMotorolabuscontrol:DataStrobeIntelbuscontrol:AddressLatchEnableMotorolabuscontrol:AddressStrobeResetinternalcounters,activelowClockinputChipSelectinput,activelowOutputtripstatus;low=outputtrippedNameRPHBYPHBBPHBVSSBPHTYPHTSETTRIPRPHTWSSZPPRZPPYZPPBVDDAD0AD1AD2PinNo.13141516171819202122232425262728TypeOOOPOOIOOOOOPIIIFunctionRedPhase,BottompowerswitchYellowPhase,BottompowerswitchBluePhase,BottompowerswitchNegativepowersupply(0V)BluePhase,ToppowerswitchYellowPhase,ToppowerswitchSetoutputtrip.120kΩinternalpull-upresistorRedPhase,ToppowerswitchWaveformSamplingSynchronisationZeroPhasePulse,RedphaseZeroPhasePulse,YellowphaseZeroPhasePulse,BluephasePositivepowersupplyMultiplexedAddress/Data(LSB)MultiplexedAddress/DataMultiplexedAddress/DataPINDESCRIPTIONSThetemperaturerangesquotedapplytoallpackagetypes.Manypackagetypesareavailableandextendedtemperature7VVSS–0·3VtoVDD+0·3V±10mA–65°Cto+125°C–40°Cto+85°C40rangescanbeofferedforsome.Furtherinformati