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  • TI Thinks Resolved

1xPWM mode logic check please...

Intellectual 350 points

Replies: 16

Views: 580

Hi,

I open new thread, because the original thread is locked.

Could you check the logic using 1xPWM mode with DRV8323RH?

  • In reply to Min-su Kim:

    Min-Su,

    Please check the high-side FET Gate and Source. I think you will find that some times when the gate signal is high, the source is also at the same high level which makes VGS = 0, the FET is OFF.

    Regards,

    -Adam
  • In reply to Adam Sidelsky:

    Adam,

    You can see the MOT signal in the previous thread.

    MOT C is always high.I think it means the FET is ON.

    Regards,

  • In reply to Min-su Kim:

    Min-Su,

    In your previous post, you did not have the motor phase wires connected, correct?

    Then you connected the phase wires.

    Have you taken more scope images with the phase wires connected and the hall sensors connected?

    Regards,

    -Adam
  • In reply to Adam Sidelsky:

    Adam,

    Yes, the motor phase wires were not connected.

    When I connected the phase wire, motor worked well.

    Unfortunately, the experiment setup was disassembed.

    Could you check the gate and phase signal?

    Thank you.

  • In reply to Min-su Kim:

    Min-su,

    We are certain that there is no issue with the 1xPWM mode logic. Please make sure to connect all hall wires and all phase wires at all times, the device will not work correctly if you do not do so. I can only debug further if you connect the motor phases and hall wires, operate the motor as normal and provide new scope screen shots.

    Regards,

    -Adam
  • In reply to Adam Sidelsky:

    Adam,

    I think the gate signals should be worked whether motor phase wire is connected or not except hall signals.
    But if you don't think so, I will not ask this question any more.


    Thank you.

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