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DRV8821: stepper motor driving modes

Telman Raoufiirani
Prodigy 10 points
Part Number: DRV8821

I have seen some terminologies for two different controlling scheme for the stepper motors. Can you please help me on this?

On part DRV8821 page 10, it says that “The DRV8821 contains four H-bridge motor drivers with current-control PWM circuitry.” So it means that it is controlling the current. On the other hand on the datasheet for the motor it say that it can be driven in two different ways: “Constant Current Control” and “ Constant Voltage Control”. My interpretation is that “Constant Voltage Control” is equal to TI’s “Current Control” method and vice versa. Can you please clarify this?

  • 0
    TI__Genius 14487 points
    Hello Telman,

    Are you able to send the datasheet for your motor so I can better understand the context? To me, constant current or voltage control would be something used in DC motors or maybe BLDC motors
  • 0 in reply to James Lockridge19
    TI__Genius 14487 points
    Hi Telman,

    A coworker provided me with some more insight to your question.

    Voltage control for stepper motors refers to driving a stepper motor in full stepping using the rated voltage for the stepper coils.

    Current control means regulating the current in each coil. This method allows the supply voltage to be higher than the rated voltage. Controlling the current also allows the stepper driver to implement microstepping modes rather than just full-stepping. The DRV8821 only performs current control, even for full stepping.