Transcription of Understanding Motor Driver Current Ratings - …
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Understanding Motor Driver Current Ratings - …
ApplicationReportSLVA505 ,especiallyasrelatedtotheselectionofa motordriverpartfora thatthereis nostandardwayofspecifyingcurrentratings, (OCP) MotorDriverThemaximumdrivecurrentobtaine dfroma givenmotordriverICis limitedbya ,butalsothePCBconstruction,ambienttemper ature, motordriverICis thoughtofasa switchorsetofswitches,it is nota dissipatedin themotordriverIC,primarilyduetoresistive losseswhichareproportionaltodrivecurrent , complexanda subjectofitsown(refertotheapplicationrep ortCalculatingMotorDriverPowerDissipatio n, SLVA504). Forthepurposesofthisdiscussion,wewillsim plifythepowerlosstothatwhichis dissipatedin theFETON-resistanceofthepowerstage,calle dRDS(ON).1 SLVA505 February2012 UnderstandingMotorDriverCurrentRatingsSu bmitDocumentationFeedbackCopyright 2012,TexasInstrumentsIncorporatedFactors LimitingtheMaximumOutputCurrentofa resistivewhenit is conductingcurrent,it dissipatespoweraccordingtoOhm'slaw:P = I2R,whereI is theDCorRMScurrentflowingtotheloadandR is thesumoftheRDS(ON) ,whendrivingcurrent,therearetwoswitchesd issipatingpower;thehigh-sideswitchtothes upply, (inwatts)bythethermalresistancetoambient temperature,referredtoas JA.
Factors Limiting the Maximum Output Current of a Motor Driver www.ti.com Since the power switch is resistive when it is conducting current, it dissipates power according to …
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