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BOOSTXL-DRV8323RS: motor current sense not stable, having overshoot

user6360875
Intellectual 280 points
Part Number: BOOSTXL-DRV8323RS

hi TI member

I have a tough question ;  when testing the motor 3-phase current , found W-phase is not stable, sometimes occurred overshoot, i don;t know whether is interference，

  but   V-phase is stable,   V-phase and W-Phase have same circuit, but occurred different waveform 

can you help give me some suggestions to check the differences ?

I have tried many ways ,

but got nothing improved 

thanks 

the following is sch  and pcb  layout

P2151_DRIVER_V4_0.brd7128.circuit.pdf 

  • 0
    TI__Mastermind 26446 points

    Thank you for posting your question in the BLDC motor drive forum!

     

    Would you be able to provide an oscilloscope plot showing the phase W current plotted along with the high and low side gate to source voltage? Can you repeat the test showing phase V? Did you see any faults that were occurring during operation? If so, what faults did you get? I will try to look over your PCB layout in the next couple days.

     

    Regards,

     

    Anthony Lodi

  • 0 in reply to Anthony Lodi
    TI__Mastermind 26446 points

    As mentioned in the email we sent you with the feedback on the layout, the main concern I saw directly related to phase C (which I believe is the same as phase W) is that the traces were longer due to the position on the PCB. This could result in some possible overshoot at that phase which wouldn't be as much of a problem for the other phases due to shorter trace lengths. If you are able to provide the waveforms as described in my last post that may give us some insight into the problem.

     

    Regards,

     

    Anthony 

  • 0
    TI__Mastermind 26446 points

    Let me know if you have any further questions.

    Regards,

    Anthony