Transcription of Calculating Motor Driver Power Dissipation - TI.com
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Calculating Motor Driver Power Dissipation - TI.com
ApplicationReportSLVA504 motordriverICfora particularapplication, givenapplication,anestimationofthetotalm otordriverpowerdissipationis MotorDriverTherearea numberofsourcesofpowerdissipationinsidea ,likethepowerdissipatedin theFETON-resistance, , (ON)DissipationThebiggestsourceofpowerdi ssipatedinsidea motordriverICis thepowerdissipatedin theFETON-resistance,orRDS(ON). Thepowerdissipatedin anH-bridge(consistingofa high-sideFETanda low-sideFET)is calculatedwiththefollowing:PRDS= (HS-RDS(ON) (IOUT(RMS))2) + (LS-RDS(ON) (IOUT(RMS))2)wherePRDSis thepowerdissipatedin theoutputFETs,HS-RDS(ON)is theresistanceofthehigh-sideFET,LS-RDS(ON )is theresistanceofthelowsideFET,andIOUT(RMS )is (ON)increaseswithtemperature,asthedevice heats, a devicehastwoH-bridges,likea typicalsteppingmotordriver, ,theoutputdevicestraversea a functionofthefollowing: riseandfalltimesoftheoutput,howquicklyth eoutputswingsfromoneextremetotheother suppl
Sources of Power Dissipation in a Motor Driver www.ti.com As an approximation, switching losses for each output are calculated as follows: PSW = PSW_RISE + PSW_FALL where PSW is the total switching loss (in watts) for one output, and PSW_RISE is the power dissipated during the rising edge, and PSW_FALL is …
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