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TPS25940: Max & Min current limit calculation.

Yee Yong Teo
Expert 4335 points
Part Number: TPS25940

Hi,

In the datasheet, R(ilim) = 89/Current(lim). How to do we calculate the max & min of current limit? Is it just purely depending on resistor tolerance? In datasheet, pg.5, table 7.5 shows a list of current limit with different resistor value. It seems like the tolerance is +-5%. Kindly advise.

Thanks.

- YY

  • 0
    TI__Guru** 105791 points
    Hi Yee Yong,

    The max & min values of current limit depends on internal circuit design, current sensing method and its variation with respect to process and temperature.
    As shown in Figure 17 of TPS25940 datasheet, the variation is +/- 8% from 1A to 5A range around nominal value. The current limit resistor tolerance adds further to it. For example, if +/-1% tolerance resistor is chosen. The overall current limit variation will be +/-9%.
    Please let me know if you need any further clarification.

    Best Regards,
    Rakesh