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DRV8323R:Inquiry about the possibility of phase shunt current measurement with DRV8323RS.

JUNGWON KIM
Prodigy 70 points
Other Parts Discussed in Thread: DRV8323R, DRV8323

부품 번호: DRV8323R

도구/소프트웨어:

Hello,

We are using the DRV8323RS to control a PMSM and measure the phase current using low-side shunt resistors.
I would like to ask if it is possible to measure the current using a phase shunt method instead of the low-side three-shunt method with the DRV8323RS.

Also, are there any precautions to consider when using the phase shunt method?

Thank you.

  • 0
    TI__Genius 12231 points

    Hi Jungwon, 

    Thank you for posting to our forum!  

    Please allow me to look into your question and follow-up shortly before the next day.

    Best Regards,

    -Joshua

  • +1 in reply to Joshua Maize
    TI__Genius 12231 points

    Hi Jungwon, 

    Our DRV8323RS driver is only designed for low-side current sensing. The current sensing inputs (SNx/SPx) have low absolute-max voltages ratings that would easily be violated if connected inline with the motor phase. (see ratings below). 

    Is there a desire/system requirement to use inline current sensing over low-side shunt sensing? If so, it would be best to use external amplifiers rather than the internal DRV8323 CSAs. 

    I hope this information has been helpful! 

    Best Regards,

    -Joshua