Allegro公司A3966步进电机驱动芯片数据手册.pdf

《Allegro公司A3966步进电机驱动芯片数据手册.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、29319.25A†3966DataSheetDUALFULL-BRIDGEPWMMOTORDRIVERTheA3966SAandA3966SLBaredesignedtodrivebothwindingsofaA3966SLBtwo-phasebipolarsteppermotor.EachdeviceincludestwoH-bridgescapableofcontinuousoutputcurrentsof±650mAandoperatingvoltagesto30V.Motorwindingcurrentcanbecontro

2、lledbytheinternalfixed-fre-OUT1A116OUT2Aquency,pulse-widthmodulated(PWM),current-controlcircuitry.ThepeakVloadcurrentlimitissetbytheuser’sselectionofareferencevoltageandPHASE2BB15PHASE12current-sensingresistors.Exceptforpackagestyleandpinout,thetwoENABLE1314ENABLE2devic

3、esareidentical.LOGICLOGICThefixed-frequencypulsedurationissetbyauser-selectedexternalGROUND413GROUNDRCtimingnetwork.ThecapacitorintheRCtimingnetworkalsodeterminesSENSE1512SENSE2auser-selectableblankingwindowthatpreventsfalsetriggeringofthePWMcurrent-controlcircuitryduri

4、ngswitchingtransitions.OUT1B611OUT2BVToreduceon-chippowerdissipation,theH-bridgepoweroutputshaveLOADBBLOGIC71V0SUPPLYCCSUPPLYbeenoptimizedforlowsaturationvoltages.ThesinkdriversfeatureAllegro’sREFERENCE89VRCRCpatentedSatlington™outputstructure.TheSatlingtonoutputscombin

5、etheREFlowvoltagedropofasaturatedtransistorandthehighpeakcurrentcapabilityofaDarlington.Dwg.PP-066-1Foreachbridge,aPHASEinputcontrolsload-currentpolaritybyselectingtheappropriatesourceandsinkdriverpair.Foreachbridge,anENABLEinput,whenheldhigh,disablestheoutputdrivers.Sp

6、ecialpower-ABSOLUTEMAXIMUMRATINGSupsequencingisnotrequired.Internalcircuitprotectionincludesthermalshutdownwithhysteresis,ground-clampandflybackdiodes,andcrossover-LoadSupplyVoltage,VBB......................30Vcurrentprotection.OutputCurrent,IOUT(peak)...........±750mAT

7、heA3966SAissuppliedina16-pindualin-lineplasticpackage.The(continuous)..............................±650mAA3966SLBissuppliedina16-leadplasticSOICwithcopperheatsinktabs.LogicSupplyVoltage,VCC....................7.0VThepowertabisatgroundpotentialandneedsnoelectricalisolati

8、on.InputVoltage,Vin........-0.3VtoVCC+0.3VSenseVoltage,VS................................1.0VFEATURESPackagePo