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DRV8841: Possible to control speed of DC through current regulation feature?

Kevin White88
Prodigy 10 points
Part Number: DRV8841
Other Parts Discussed in Thread: DRV8830, DRV8832

I'm curious as to whether the current regulation feature of this motor can be used as a very rough speed control for DC motor.  Since only 4 levels can be controlled, I realize that it will never have the resolution of PWM control, but my application requires very rough control of 12 separate motors.  Is this configuration possible with 12 DRV8841 controllers?

  • 0
    TI__Genius 14487 points

    Hi Kevin,

    I don't think the DRV8841 will work very well for a speed control application. The current regulation feature will control your torque rather than your speed. Depending on the torque requirements of your load, it may be possible for your system to find four different operating points on the torque-speed curve of your motor. However, for no-load/free spinning conditions, the speed will always be maximum.

    The DRV8832 and DRV8830 are our only devices that have a speed control feature, however the voltages are lower than the DRV8841.