3986芯片的步进电机驱动设计方案

3986-DS,Rev.1FeaturesandBenefits▪2-wirestepanddirectioninterface▪Dualfull-bridgegatedriveforN-channelMOSFETs▪Operationover12to50Vsupplyvoltagerange▪Synchronousrectification▪Cross-conductionprotection▪Adjustablemixeddecay▪IntegratedsinusoidalDACcurrentreference▪Fixedoff-timePWMcurrentcontrolDualFull-BridgeMOSFETDriverwithMicrosteppingTranslatorContinuedonthenextpage…Package:38pinTSSOP(suffixLD)TypicalApplicationDiagramApproximatesizeA3986DescriptionTheA3986isadualfull-bridgegatedriverwithintegratedmicrosteppingtranslatorsuitablefordrivingawiderangeofhigherpowerindustrialbipolar2-phasesteppermotors(typically30to500W).MotorpowerisprovidedbyexternalN-channelpowerMOSFETsatsupplyvoltagesfrom12to50V.ThisdevicecontainstwosinusoidalDACsthatgeneratethereferencevoltagefortwoseparatefixed-off-timePWMcurrentcontrollers.TheseprovidecurrentregulationforexternalpowerMOSFETfull-bridges.Motorsteppingiscontrolledbyatwo-wirestepanddirectioninterface,providingcompletemicrosteppingcontrolatfull-,half-,quarter-,andsixteenth-stepresolutions.Thefixed-offtimeregulatorhastheabilitytooperateinslow-,mixed-,orfast-decaymodes,whichresultsinreducedaudiblemotornoise,increasedstepaccuracy,andreducedpowerdissipation.ThetranslatoristhekeytotheeasyimplementationofthisIC.SimplyinputtingonepulseontheSTEPinputdrivesthemotoronestep(full,half,quarter,orsixteenthdependingonthemicrostepselectinput).Therearenophase-sequencetables,highfrequencycontrollines,orcomplexinterfacestoprogram.Thisreducestheneedforacomplexmicrocontroller.DualFull-BridgeMOSFETDriverwithMicrosteppingTranslatorA39862AllegroMicroSystems,Inc.115NortheastCutoff,Box15036Worcester,Massachusetts01615-0036(508)853-5000(packageLD).Thepackageislead(Pb)free,with100%mattetinleadframeplating.Description(continued)SelectionGuidePartNumberPacking*A3986SLD-TTube,50piecespertubeA3986SLDTR-TTapeandreel,4000piecesperreel*ContactAllegroforadditionalpackingoptionsAbsoluteMaximumRatingsCharacteristicSymbolNotesRatingUnitsSupplyVoltageVBB–0.3to50VLogicSupplyVoltageVDD–0.3to7VLogicInputsandOutputs–0.3to7VSENSExpins–1to1VSxxpins–2to55VLSSxpins–2to5VGHxxpinsSxxtoSxx+15VGLxxpins–2to16VCxxpins–0.3toSxx+15VOperatingAmbientTemperatureTARangeS–20to85ºCJunctionTemperatureTJ(max)150ºCStorageTemperatureTstg–55to150ºCDualFull-BridgeMOSFETDriverwithMicrosteppingTranslatorA39863AllegroMicroSystems,Inc.115NortheastCutoff,Box15036Worcester,Massachusetts01615-0036(508)853-5000(508)853-5000=25°C,VDD=5V,VBB=12to50V,unlessnotedotherwiseCharacteristicsSymbolTestConditionsMin.Typ.Max.UnitsSupplyandReferenceLoadSupplyVoltageRangeVBB12–50VLoadSupplyCurrentIBBROSC=10kΩ,CLOAD=1000pF––10mAENABLE=High,outputsdisabled––6mALoadSupplyIdleCurrentIBBQRESET=0––100μALogicSupplyVoltageRangeVDD3.0–5.5VLogicSupplyCurrentIDD––10mALogicSupplyIdleCurrentIDDQRESET=0––300μARegulatorOutputVREGIREGInt=30mA11.25–13VBootstrapDiodeForwardVoltageVfBOOTIfBOOT=10mA0.60.81VGateOutputDriveTurn-OnRiseTimetrCLOAD=1000pF,20%to80%80120160nsTurn-OffFallTimetfCLOAD=1000pF,80%to20%406080nsTurn-OnPropagationDelaytp(on)ENABLElowtogatedriveon–180–nsTurn-OffPropagationDelaytp(off)ENABLEhightogatedriveoff–180–nsCrossoverDeadTimetDEADROSC=10kΩ,0.6–1.2μsPull-UpOnResistanceRDS(on)UPIGH=–25mA304055ΩPull-DownOnResistanceRDS(on)DNIGL=25mA141924ΩShort-CircuitCurrent–Source1ISC(source)–140–110–80mAShort-CircuitCurrent–SinkISC(sink)160200250mAGHxOutputVoltageVGHxCBOOTxfullychargedVC–0.2––VGLxOutputVoltageVGLxVREG–0.2––VLogicInputsInputLowVoltageVIL––0.3VDDVInputHighVoltageVIH0.7VDD––VInputHysteresisVIHys150300–mVInputCurrent1IIN–1–1μARESETPulseWidth2twR0.2–1μsContinuedonthenextpage...DualFull-BridgeMOSFETDriverwithMicrosteppingTranslatorA39865AllegroMicroSystems,Inc.115NortheastCutoff,Box15036Worcester,Massachusetts01615-0036(508)853-5000