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.
Application Report SLVA505– February 2012 Understanding Motor Driver Current Ratings Peter Millett..... Motor Drive Business Unit ABSTRACT There is much misunderstanding about the current ratings used with motor driver ICs, especially as
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Motor, Motor Protection Circuit, 140MG Motor Protection Circuit Breaker, Motor Branch Circuit Protection, Motor Circuit Protection Motor circuit protection, Circuit protection, Electric Motor Controls, Circuit, Low voltage power circuit protection, Motor Circuit Protection Tables, Motor Protection Relay, Motor Calculations Refer to pg. 49, Drive a Single Phase Brushless DC BLDC, Texas Instruments