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TPS2HB35-Q1: Relationship between Current Limit Threshold and RILIM

Jeff Yun
Expert 4225 points
Part Number: TPS2HB35-Q1

Hi, Team

Hope you are doing well!

From the TPS2HB35-Q1 datasheet, I know that ICL=KCL / RILIM.

For B version, the KCL = 140 A* kΩ.

From datasheet, when RILIM = 25 kΩ, the ICL = 140/25 = 5.6A which matches the typ value in datasheet.

But when RILIM = 5 kΩ, the ICL should be ICL = 140/5 = 28A. But the typ value in datasheet is 25A.

Could you please help explain why there is such a difference?

Thanks & Best Regards

Jeff

  • 0
    TI__Mastermind 35015 points

    Jeff,

    You can actually use any resistor value in between and set a custom/tailored current limit to your application. In general for our high-side switches, the lower-Ron devices will be more accurate at higher current limits.

    We provide a calculator tool that will account for all accuracies/tolerances for our HB device current limits below. I recommend using this:

    https://www.ti.com/lit/zip/slvrbg2

    Timothy Logan
    Applications Manager - Power Switches