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TPS1HC100-Q1: ILIM resistance

Soumya Gutti
Prodigy 140 points
Part Number: TPS1HC100-Q1
Other Parts Discussed in Thread: TPS1HC30-Q1,

1) Should we use ILIM resistance only between 7.15kΩ to 71.5kΩ ? Can I use 5.1k as R_ILIM to limit current of 7A? (If yes, what is the KCL value i should consider as it not mentioned in the graph)

2) I have used R_ILIM : 5kΩ , Iout : 7A ; Rsns : 820Ω VSNS(calc) : 5.57V

From simulation : Vsns is 5.57V till 0.9sec after that it is clamped to 4.9V. This clamping time is increasing if the voltage increases.
Why is this happening? It should clamp to 4.9V if Voltage is greater than 4.9V?

  • +1
    TI__Mastermind 34935 points

    Soumya,

    The TPS1HC100-Q1 does not support any current limit setting outside of the specified ILIM resistance values in the datasheet. For higher current limit values, I would suggest using the TPS1HC30-Q1 that is pin-to-pin compatible and supports higher current limits due to its lower on resistance.

    For the simulation, we do not support any ILIM values outside of the datasheet parameters. For the specific behavior that you are referring to, this device actually has a feature where the voltage of the input/diagnostic input digital pins are looked at and this is used as the "fault" voltage:

    This means that if any fault happens in the system such as overcurrent or open load, the VSNSFH will be output on the SNS pin.

    Best Regards,
    Tim

  • 0 in reply to Timothy Logan
    Prodigy 140 points

    Hi Tim,

    Thanks for your reply.

    Regards

    Soumya