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DRV8323: Compatibility with brushed DC motor drive

Alexandre BALDINO
Intellectual 520 points
Part Number: DRV8323

Hi,

I'd like to know if the DRV8323 can be used to control a brushed DC motor.

Please can you confirm this?

Thank you,

Best regards

  • 0
    TI__Mastermind 21805 points

    Hello Alexandre,

    DRV8323 can support brushed-DC motor drive.

    3x PWM mode would allow you to control the motor like below. I recommend tying INLA & INLB together (the pins are used to activate the 1/2-H bridges).

    INLA & INLB

    INHA

    INHB

    SHA

    SHB

    Drive Mode

    0

    X

    X

    Hi-Z

    Hi-Z

    Coast

    1

    0

    0

    L

    L

    Low-side brake

    1

    0

    1

    L

    H

    Reverse Drive

    1

    1

    0

    H

    L

    Forward Drive

    1

    1

    1

    H

    H

    High-side brake

    Motor braking can be accomplished through the high-side FETs or low-side FETs, there isn't really a difference from the motor standpoint. Most customers use the low side FETs since it is the most common practice.

    INLC and INHC would control the third 1/2-H bridge. If you are not using the third 1/2-H bridge, tie INLC and INHC to GND and tie SHC to GND through a 330 ohm resistor.

    Thanks,

    Matt