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DRV8601: What will happen if PWM I/O supply voltage isn't same voltage as VDD?

Ray Chang
Intellectual 1345 points
Part Number: DRV8601

Hi, Team

We have a question for DRV8601 reference circuit as below.

Could you let us know what will happen if PWM I/O supply voltage isn't same voltage as VDD?

Does the driver unable to stop the vibrator by change the PWM duty cycle to 50%?


  • 0
    TI__Guru* 95745 points
    Hi Ray,

    This configuration needs VDD = Vpwm so the REFOUT voltage is the required one.
    The first two paragraphs from DRV8601 data sheet section 8.2.1.2 explain further the relation between VDD, REFOUT and 50% duty cycle to stop the actuator.
    If there is a difference between VDD and Vpwm the REFOUT voltage, VDD/2 won't match with Vpwm/2 so the actuator will be most likely keep rotating to one side while it should be stopped. This will also affect the changes in direction of rotation related with the PWM signal duty cycle.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators