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DRV10963: ILIMIT Soft current limit value

Hirotaka Matsumoto
Guru 27585 points
Part Number: DRV10963

Hi all

Would you mind if we ask DRV10963?

Could you let us know the background of "Default ILIMIT Soft current limit value=0.5A"?
As our assumption;
-Total Driver H+L Rdson Less than 1.5 Ω?(large Rdson?)
-IOCP=1.8A, so If ILIM=1.0A, it is so close to IOCP value.

Kind regards,

Hirotaka Matsumoto

  • 0
    Guru 27585 points

    Hi team

    We guess that your days are so busy, however could you let us know the reply?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Expert 6065 points
    Sorry I missed replying to this question.

    Question 1) What is the background of using 0.5A as the defualt soft current limit
    Answer: We decided to use 0.5A as the defualt soft current limit because most of fans we expect are in ohms of resistance (as you can see from datasheet Table 11. Key Motor Characteristics and Recommended Ranges) so we dont expect high current draw. However, if you want higher current draw, you can order the DRV10963P OTP part which has soft current limit disabled.

    Question 2) Total Driver H+L Rdson Less than 1.5 Ω?(large Rdson?)
    Answer: The max total rdson is 1.5Ω. The motors we expect to spin have high resistance (as you can see from datasheet Table 11. Key Motor Characteristics and Recommended Ranges) so rdson of the fets can be higher.

    Let me know if this answered your question.