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DRV8871: Is it OK to drive 2 Unidirectional Motors

MattLin
Intellectual 1050 points
Part Number: DRV8871
Other Parts Discussed in Thread: DRV8876, , DRV8837

Hi Team,

There are a number of BDC MD parts like the DRV8876 that are marketed as being able to drive two unidirectional motors or a single bidirectional whereas the DRV8871 is only marketed as a bidirectional motor driver. Is there any concern with using the DRV8871 in a dual unidirectional motor driver configuration?

Regards,

Matt

  • 0
    TI__Mastermind 37683 points

    Hi Matt,

    The reason why the DRV8876 can drive two unidirectional motors is because it allows for independent control of each half-bridge. The DRV8871 only supports PWM control interface and does not allow for direct independent control for each half-bridge. However, there is a way to modify the input control signals (INx) to drive two unidirectional motors. Section 7.3.2 of the DRV8837 datasheet explains how to do this modification. The DRV8837 has the same PWM control interface as the DRV8871 so the same procedure can be applied to the DRV8871. Please read that section of the datasheet to learn more.

    Is there a reason for using the DRV8871 rather than the DRV8876? If you need independent half-bridge control, the DRV8876 will be the better option. Both of these devices have similar current rating but the DRV8871 has higher voltage ratings.