ReprapStepperDriverA4988StepperMotorDriver Description: A4988isacompletemicrosteppingmotordriverwithbuilt-intranslatorforeasyoperation.Thisproductisavailableinfull,half,1/4,1/8and1/16stepmodesoperatebipolarsteppermotors,outputdrivecapacityofupto35Vand±2A.A4988includesafixedoff-timecurrentregulator,theregulatorinslowormixeddecaymodes.A4988converteristhekeytotheeasyimplementation.Aslongasthe"step"inputinputtingonepulsedrivesthemotoronemicrostep.Therearenophasesequencetables,highfrequencycontrollines,orcomplexinterfacestoprogram.A4988interfaceisverysuitableforcomplexmicroprocessorisunavailableorisoverburdened. Inthemicro-stepoperation,A4988choppingcontrolinsideautomaticallyselectsthecurrentdecaymode(SloworMixed).Inmixeddecaymode,thedeviceisinitiallysettoafixeddowntimeinsomefastdecay,thentherestoftheslowdecaydowntime.Mixeddecaycurrentcontrolschemeresultsinreducedaudiblemotornoise,increasedstepaccuracy,andreducedpowerconsumption.Internalsynchronousrectificationcontrolcircuitryisprovidedtoimprovethepulse-widthmodulation(PWM)operationpowerconsumption.Internalcircuitprotectionincludes:thermalshutdownwithhysteresis,undervoltagelockout(UVLO),andcrossover-currentprotection.Specialpowersequencing. A4988surfacemountQFNpackage(ES),asizeof5mm×5mm,nominaloverallpackageheightof0.90mm,withanexposedpadforenhancedthermaldissipation.ThispackageisPb(suffix-T),with100%mattetinleadframeplating. FeaturesandBenefits ·LowRDS(On)Output ·Automaticcurrentdecaymodedetection/selection ·Mixwithslowcurrentdecaymodes ·Synchronousrectificationforlowpowerdissipation ·InternalUVLO ·Cross-currentprotection ·3.3and5Vcompatiblelogicsupply ·Thermalshutdowncircuitry ·Groundfaultprotection ·Loadshort-circuitprotection ·Optionalstepfivemodes:full,1/2,1/4,1/8and1/16 Dear buyer: Pls leave message you want which color,otherwise we shipgreen A4988 to you! PackageIncluded: 1XA4988StepperDriver 1XHeatsink _x000D_