• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 28 subscribers
  • Views 178 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8245-Q1: About IPRPPI Regulation

Daiki Mizushima
Prodigy 30 points
Part Number: DRV8245-Q1

Hi, support team.

I would like to ask a question about the contents of IPROPI in the data sheet.

Why does the accuracy of the current sensor change depending on the output current?

Thank you.

  • 0
    TI__Guru 54675 points

    Mizushima-san,

    I am investigating.  Please allow until Monday, Jan 24 for response.

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    TI__Guru 54675 points

    Mizushima-san,

    The sense element used for the internal current sensing is a small power FET, referred to a sense FET. The matching of the power FET to this sense FET sets the current sense gain, AIPROPI.

    This matching is well controlled at higher current levels. There is significant degradation in this matching at lower currents due to the change of FET operating region, temperature gradients and increased sensitivity to other uncontrolled variables in the design, which ultimately results in wider error limits.

    Regards,

    Ryan