DRV8316: about current limit

Part Number: DRV8316

Hello E2E,

About a formula (4), are Ioutx source side current only? If include the sink current, this formula is not to establish.

Best regards,
ACGUY

  • Hi ACGUY,

    Thanks for your question. One of our experts will respond tomorrow.

    Thanks,

    Matt

  • Hi ACGUY,

    This device does look at both source and sink current in the formula for cycle-by-cycle current limit. This is to properly measure the total current in the motor.

    For example if the motor is in BRAKE state with all three low-side MOSFETs ON, the measured current would be zero (IA+IB+IC = 0) since there is no drive vector being applied.

    In the case of the motor being actively driven, IA+IB+IC will not be zero and the device can regulate the drive current.

    Thanks,

    Matt

  • Hi Matt,

    Thank you for reply.
    The maximum current limit is 8A and Vref is 1.25V and GAIN is 0.15.
    There is always a source and a sink to energize the motor, and if IoutA = 8A_source, then IoutB = IoutC = 4A_sink.
    Is the total current 8A in this case? Or is it 16A?

    Regards,
    ACGUY

  • Hi ACGUY,

    Thank you for your question! One of us will try to respond to your question on Monday.

    Regards,

    Anthony