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DRV8701: If use EN as PWM input to control speed, why the motor doesn't get in brake mode?

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8701


Hi team,

Here's an issue from the customer may need your help:

DRV8701 can use PH/EN to support PWM speed control by EN pin.

But base on table1, while EN is low, motor will get in brake mode.

Is there any other setting need to modify if they want to use EN pin to control speed but not get in brake mode?

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Guru 55655 points

    Cherry,

    Why does the customer not want to use BRAKE state?  This is very common for a brushed motor to use low-side slow decay when not driving.  Torque is maintained as current decays "slowly" in the windings.  If output is HIZ (coast), then current decays quickly and torque is lost.  It is not really a physical "brake" state.

    Regards,

    Ryan