UCC3626

UCC3626UCC2626UCC3626PRELIMINARY04/99FEATURES•TwoQuadrantandFourQuadrantOperation•IntegratedAbsoluteValueCurrentAmplifier•Pulse-by-PulseandAverageCurrentSensing•Accurate,VariableDutyCycleTachometerOutput•TrimmedPrecisionReference•PrecisionOscillator•DirectionOutputBrushlessDCMotorControllerBLOCKDIAGRAMDESCRIPTIONTheUCC3626motorcontrollerICcombinesmanyofthefunctionsre-quiredtodesignahighperformance,twoorfourquadrant,3-phase,brushlessDCmotorcontrollerintoonepackage.Rotorpositioninputsaredecodedtoprovidesixoutputsthatcontrolanexternalpowerstage.AprecisiontriangleoscillatorandlatchedcomparatorprovidePWMmo-torcontrolineithervoltageorcurrentmodeconfigurations.Theoscilla-toriseasilysynchronizedtoanexternalmasterclocksourceviatheSYNCHinput.Additionally,aQUADselectinputconfiguresthechiptomodulateeitherthelowsideswitchesonly,orbothupperandlowerswitches,allowingtheusertominimizeswitchinglossesinlessde-mandingtwoquadrantapplications.Thechipincludesadifferentialcurrentsenseamplifierandabsolutevaluecircuitwhichprovideanaccuratereconstructionofmotorcurrent,usefulforpulsebypulseovercurrentprotectionaswellasclosingacurrentcontrolloop.Aprecisiontachometerisalsoprovidedforimple-mentingclosedloopspeedcontrol.TheTACH_OUTsignalisavariabledutycycle,frequencyoutputwhichcanbeuseddirectlyfordigitalcon-trolorfilteredtoprovideananalogfeedbacksignal.Otherfeaturesin-cludeCOAST,BRAKE,andDIR_INcommandsalongwithadirectionoutput,DIR_OUT.2UCC2626UCC3626ELECTRICALCHARACTERISTICS:Unlessotherwisestated,thesespecificationsapplyforVCC=12V;CT=1nF,RTACH=250K,CTACH=100pF,TA=TJ,TA=–40°Cto+85°CfortheUCC2626,and0°Cto+70°CfortheUCC3626.PARAMETERTESTCONDITIONSMINTYPMAXUNITSOverallSupplyCurrent310mAUnder-VoltageLockoutStartThreshold10.5VUVLOHysteresis0.5V5.0VReferenceOutputVoltageIVREF=–2mA4.955.1VLineRegulation11V30mVShortCircuitCurrent40120mACoastInputComparatorThreshold1.75VHysteresis0.1VInputBiasCurrent0.1µAABSOLUTEMAXIMUMRATINGSSupplyVoltageVDD..............................+15VInputsPins20,19,18,21,15,16,17,7,12,9,10....–0.3VtoVDDPins13,14............................–0.3Vto8.0VOutputCurrentPins22,23,24,25,26,27.....................±200mAPins2......................................–20mAPins3.8,11...................................1mAStorageTemperature...................–65°Cto+150°CJunctionTemperature...................–55°Cto+150°CLeadTemperature(Soldering10Seconds)..........+300°CNote:Unlessotherwiseindicated,voltagesarereferencedtoground.Currentsarepositiveinto,negativeoutofspecifiedter-minal.ConsultpackagingsectionofDatabookforthermallimi-tationsandconsiderationsofpackage.UCCPACKAGETEMPERATURERANGEORDERINGINFORMATIONTEMPERATURERANGEPACKAGEUCC2626NDILUCC2626DW–40°Cto+85°CSOICUCC2626PWTSSOPUCC3626NDILUCC3626DW0°Cto+70°CSOICUCC3626PWTSSOP3UCC2626UCC3626ELECTRICALCHARACTERISTICS:Unlessotherwisestated,thesespecificationsapplyforVCC=12V;CT=1nF,RTACH=250K,CTACH=100pF,TA=TJ,TA=–40°Cto+85°CfortheUCC2626,and0°Cto+70°CfortheUCC3626.PARAMETERTESTCONDITIONSMINTYPMAXUNITSCurrentSenseAmplifierInputOffsetVoltageVCM=0V5mVInputBiasCurrentVCM=0V10µAGainVCM=0V4.955.1V/VCMRR–0.3V11VdBOutputHighVoltageIIOUT=–100µA5VOutputLowVoltageIIOUT=100µA50mVOutputSourceCurrentVIOUT=2V500µAPWMComparatorInputCommonModeRange2.08.0VPropogationDelay75nSOver-CurrentComparatorInputCommonModeRange0.05.0VPropogationDelay175nSLogicInputsLogicHighQUAD,BRAKE,DIR3.5VLogicLowQUAD,BRAKE,DIR1.5VInputCurrentQUAD,BRAKE,DIR0.1µAHallBufferInputsVILHALLA,HALLB,HALLC1VVIHHALLA,HALLB,HALLC1.9VInputCurrent0V–25µAOscillatorFrequencyRTACH=250k,CT=1nF10KHzFrequencyChangeWithVoltage12V5%CTPeakVoltage7.5VCTValleyVoltage2.5VCTPeak-to-ValleyVoltage5.0VSYNCHPinMinimumPulseWidth–500nsTachometerVOH/VREFIOUT=–10µA99100%VolIOUT=10µA020mVRONHighIOUT=–100µA1kΩRONLowIOUT=100µA1kΩRampThreshold,Lo20mVRampThreshold,Hi2.52VCTACHChargeCurrentRTACH=49.9kΩ50µAT-onAccuracyNote1–33%DirectionOutputDIROUTHighLevelIOUT=–100µA3.55.1VDIROUTLowLevelIOUT=100µA1V4UCC2626UCC3626PINDESCRIPTIONSAHI,BHI,CHI:Digitaloutputsusedtocontrolthehighsideswitchesinathreephaseinverter.Forspecificde-codinginformationreferenceTableI.ALOW,BLOW,CLOW:Digitaloutputsusedtocontrolthelowsideswitchesinathreephaseinverter.Forspe-cificdecodinginformationreferenceTableI.BRAKE:BRAKEisadigitalinputwhichcausesthede-vicetoenterbrakemode.Inbrakemodeallthreehighsideoutputsareturnedoff,AHI,BHI&CHI,whileallthreelowsideoutputsareturnedon,ALOW,BLOW,CLOW.Duringbrakemodethetachometeroutputre-mainsoperational.TheonlyconditionswhichcaninhibitthelowsidecommandsduringbrakeareUVLO,ex-ceedingpeakcurrent,theoutputofthePWMcompara-tor,ortheCOASTcommand.COAST:TheCOASTinputconsistsofahystereticcom-paratorwhichdisablestheoutputs.Theinputisusefulinimplementinganovervoltagebusclampinfourquadrantapplications.Theoutputswillbedisabledwhentheinputisabove1.75V.CT:ThispinisusedinconjunctionwiththeR_TACHpintosetthefrequencyoftheoscillator.Atimingcapacitorisnormallyconnectedbetweenthispointandgroundandisalternatelychargedanddischargedbetween2.5Vand7.5V.C_TACH:Atimingcapacitorisconnectedbetweenthis