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DRV8850 VPROPI accuracy

Jarrod Eliason
Prodigy 10 points
Other Parts Discussed in Thread: DRV8850

Competitor products with scaled current sense output specify the range of current scaling accuracy, but I only see the typical value of 2000 in the DRV8850 datasheet.  Can you provide some statistical data so I can get a feel for how much variability to expect?

  • 0
    TI__Guru** 114905 points
    Hi Jarrod,

    We will investigate and get back to you. This may take a couple of days.
  • 0 in reply to Rick Duncan
    TI__Guru** 114905 points

    Hi Jarrod,

    We were able to locate some data.

    Please note this data is taken on a small sample size and can vary from die to die, over process and over temperature. This data was taken at 2A and shows an offset in the mean between OUT1 and OUT2.

    You may want to consider to calibrating VPROPI using two data points.

     Mean 25°C   Standard Deviation
    2.2v 4.2v 5.5v 2.2v 4.2v 5.5v
     OUT1_VPROPI 2029.63 2128.15 2160.61 42.36 67.6 79.07
    OUT2_VPROPI 1841.66 1793.22 1768.39 41.22 60.39 69.31

    I hope this helps.