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DRV8801: Voltage available for PWM

Shankar Srinivasan
Prodigy 20 points
Part Number: DRV8801

Hi,

I'm using a motor that has a PWM range of 0-16v. I have a Pololu DRV8801 driver that is triggered by a WeMos micro controller. Though the prototype is working, and the Vbb = 16v, the max voltage available voltage to the motor during the PWM operation seems to be only 5~6v.

a. Is this normal?

b. If so, are there driver boards that will deliver the entire Vbb to the motor?

Thanks

  • 0
    TI__Expert 4435 points
    Hello Shankar,

    The DRV8801 device is able to drive from 8V - 36V, so 16V should be no problem. When you are applying 16V to VBB, what is the VCP voltage?
    How are you controlling the motor (enable, mode1, mode2)?
    Have you tried not PWMing but applying a constant high signal (100% DC)? what happens then?
  • 0 in reply to Luis Riveros
    Prodigy 20 points
    Hi Luis,
    Thanks for the response. Since the pin 13 (Vcp) is not exposed as a pin connection in the Polou board, I haven't tried measuring it. I'm using the DIR and PWM pins to be set high and 255 respectively in my WeMos code which in my understanding is as good as stable DC..however, I'll try your suggestion too and revert shortly.
    From what you mention above, this is not normal right? As in I should be able to see all the Vbb being delivered to the Out+ & Out-, right?

    regards
    Shankar