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DRV8702D-Q1: High side or Low side PWM drive?

Mark Guastaferro
Genius 11645 points
Part Number: DRV8702D-Q1

When using the half bridge motor drive like the DRV8702D, are there trade-offs when deciding whether to drive the motor with a PWM signal driving the low side FET vs driving the high-side FET? This question assumes the internal current regulation feature of DRV8702D is not used, so operating in MODE = 1. 

  • 0
    TI__Guru** 114905 points
    Hi Mark,

    One tradeoff is possible fault conditions. If a short to GND is more probable than a short to VM at SH, using the high side FET to drive the motor makes more sense.

    If one side of the motor is connected to VM and the low side FET is used to drive the motor, a short to ground at SH would cause the motor to run.

    If one side of the motor is connected to ground and the high side FET is used to drive the motor, a short to ground at SH would cause a fault.