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DRV8873: iProp Question

Brian Angiel
Expert 4060 points
Part Number: DRV8873

Regarding DRV8873, my understanding from the data sheet is that you can connect the 2 iProp lines together and their currents will add.  I have 3 DRV8873 where I use 6 half bridges and only run one at a time.  Can I connect all 6 iProp lines to one resistor?  I only need to sense one current because I only turn on one of the 6 half bridges at a time.

Thanks!

Brian Angiel

  • 0
    TI__Guru** 114905 points
    Hi Brian,

    This should be possible, but there may be some constraints. We will investigate and should have an answer by Wednesday next week.

    Do you intend to have the 3 DRV8873s awake (nSLEEP high) when operating one half bridge?
  • 0 in reply to Rick Duncan
    TI__Expert 4060 points
    Hi Rick,

    Yes, all 3 are tied to the same nSleep control and all 3 are tied to a separate Disable control from the MSP432. The nSleep would be low when none of the 3 DRV8873 are needed. The disable would go low once the SPI registers are set to turn on the single half bridge. After that I have the choice of using an input or software to toggle the output.

    Thanks,
    Brian
  • 0 in reply to Brian Angiel
    TI__Guru** 114905 points
    Hi Brian,

    The design team confirmed the configuration should work, as long as all three devices are powered at the same voltage and awake.
    Since all 3 are tied to the same nSLEEP, there should be no problem.