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.
www.ti.com Example Calculation 2 Example Calculation Section 2.2 shows an example power dissipation calculation for a DRV8825 motor controller driving a bipolar stepper motor operated with current regulation.
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