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DRV8801A-Q1 Use as a half H-bridge driver

Jared Becker
Genius 11845 points
Other Parts Discussed in Thread: DRV8801A-Q1

Hi Team,

Is it possible to use the DRV8801A-Q1 as a single ended driver without creating diagnostic fault codes or losing functionality?

Thank you,

Jared

  • 0
    TI__Guru** 114905 points
    Hi Jared,

    We will have to check, but in theory it is possible.

    To confirm, please answer the following questions:
    1) will the motor voltage be present before or after the DRV8801A-Q1 VBB voltage?
    2) how are the inputs being controlled? (PH/EN/MODE1/MODE2)

    Some of the bridge control cannot be used when the motor is configured this way.
  • 0 in reply to Rick Duncan
    TI__Genius 11845 points
    Hi Rick,

    1) will the motor voltage be present before or after the DRV8801A-Q1 VBB voltage?

    I am not sure yet.. What are the consequences if the motor voltage is present before the DRV8801A-Q1 voltage?

    2) how are the inputs being controlled? (PH/EN/MODE1/MODE2)

    The inputs are being controlled from an MCU. Do you know specifically which aspects of the bridge control cannot be used when configured this way?

    Best regards,
    Jared
  • 0 in reply to Jared Becker
    TI__Guru** 114905 points

    Hi Jared,

    Jared Becker said:
    1) will the motor voltage be present before or after the DRV8801A-Q1 VBB voltage?

    I am not sure yet.. What are the consequences if the motor voltage is present before the DRV8801A-Q1 voltage?

    That is one item we must check.

    Jared Becker said:
    2) how are the inputs being controlled? (PH/EN/MODE1/MODE2)

    The inputs are being controlled from an MCU. Do you know specifically which aspects of the bridge control cannot be used when configured this way?

    There may be other conditions, but ENABLE = 0, MODE1 = 1, and MODE2 =0 results in current flowing through the motor (low side slow decay). This condition should be avoided.