TI_DRV8870有刷DC马达驱动解决计划.docx

TI_DRV8870有刷DC马达驱动解决计划TI_DRV8870有刷DC马达驱动解决规划TIDRV8870有刷DC马达驱动解决规划TI公司得DRV8870是有刷DC马达驱动器,两个输入控制H桥驱动器,它包括了4个N-MOSFET,双相控制电流高达3.6A,工作电压6.5-V到45-V,PWM控制接口,具有欠压锁住(UVLO),过流保护(OCP),热关断(TSD)和故障自动恢复等保护功能,主要用在打印机,家用电器,工业设备和其它小型设备.本文介绍了DRV8870主要特性,功能框图,应用框图以及评估板DRV8870EVM特性,电路图和硬件设计文件.TheDRV8870isabrushed-DCmotordriverforp rinters,appliances,industrialequipment,andothersmallmachines.TwologicinputscontroltheH-bridgedriver,whichconsistsoffourN-channelMOSFETsthatcancontrolmotorsbidirectionallywithupto3.6-Apeakcurrent.Theinputscanbepulse-widthmodulated(PWM)tocontrolmotorspeed,usi。

ngachoiceofcurrent-decaymodes.Settingbothinputslowentersalow-powersleepmode.TheDRV8870featuresintegratedcurrentregulation,basedontheanaloginputVREFandthevoltageonpinISEN,whichisproportionaltomotorcurrentthroughanexternalsenseresistor.Theabilitytolimitcu rrenttoaknownlevelcansignificantlyreducethesystempowerrequirementsandbulkcapacitanceneededtomaintainstablevoltage,especiallyformotorstartupandstallconditions.Thedeviceisfullyprotectedfromfaultsandshortcircuits,includingunder-voltage(UVLO),over-current(OCP),an。

dover-temperature(TSD).Whenthefaultconditionisremoved,thedeviceautomaticallyresumesnormaloperation.DRV8870主要特性:H-BridgeMotorDriverDrivesOneDCMotor,OneWindingofaStepperMotor,orOtherLoadsWide6.5-Vto45-VOperatingVoltage565-mTypicalRDS(on)(HS+LS)3.6-APeakCurrent DrivePWMControlInterfaceIntegratedCurrentRegulationLow-PowerSleepModeSmallPackageandFootprint8-PinHSOPWithPowerPAD4.96.0mmIntegratedProtectionFeaturesVMUndervoltageLockout(UVLO)OvercurrentProtection(OCP)ThermalShutdown(TSD)AutomaticFaultRecoveryDRV8870应用:PrintersAppliance。

sIndustrialEquipmentOtherMechatronicApplications图1.DRV8870功能框图图2.DRV8870应用框图评估板DRV8870EVMDRV8870H-BridgePWMMotorDriverEvaluationModuleTheDRV8870EVMisacompletesolutionforevaluatingtheDRV8870brushedmotordriver.Itincludesavoltageregulatortocreate5V,andaTLC555timerconfi guredtosupplyaPWMinputtotheDRV8870.TheEVMalsoincludesapotentiometertoadjustthespeedofthemotorbyvaryingthedutycycleofthePWMandasecondpotentiometertosetthechoppingcurrentvalue.Jumpersareprovidedtoconfigureeachinputtoalogiclow,logichigh,PWM,ortoallowusercontroloftheinputs.Testpointsareprovidedforeaseofmonitoringtheinputandoutputsignals.TheDRV8870EVMonlyrequiresconnectionstothemotorandpowersupplytooperate.图3.评估板DRV8870EVM外形图图4.评估板DRV8870EVM电路图(1)图5.评估板DRV8870EVM电路图(2)AO-Electronics傲壹电子官网：http:/中文网：http:/。

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