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TPS2595: Lower ILIM in wake up with output short

Shinya Sawamoto
Expert 5285 points
Part Number: TPS2595

Hello team,

I saw an unexpected lower ILIM behavior in wake up with output short.
That behavior is like the waveform(Figure 37), but I can't find any description why that ILIM(1.2A) is lower than expected value(4.17A w/RLIM=487ohm).
Is there any hidden ILIM design spec?

Thanks in advance.
S.Sawamoto

  • 0
    TI__Guru 57737 points

    Hi Sawamoto,

    The TPS2595x has a current fold-back feature that limits current to a value less than the current limit set by RILIM. This fold-back occurs when the TPS25952x output voltage is below 1V. There is a comparator that monitors the output voltage and triggers this fold-back current at <1V. For example, if the RILIM is 1.78KΩ the current limit is set for 1.17A normally.  If a low impedance short is applied to the output and the output drops below 1V the fold-back will activate and the current will be limited to a current less than 1.17A. The fold-back current can vary depending on the impedance of the short, Vin and RILM setting.

  • 0 in reply to Praveen GD
    TI__Expert 5285 points

    Thanks Praveen,

    That is very helpful information but I can't find it on the current datasheet.
    I hope it is described on the datasheet at the next revision timing.

    Thanks,
    S.Sawamoto

  • 0 in reply to Shinya Sawamoto
    TI__Guru 57737 points

    Hi Sawamoto,

    It is not explicitly mentioned in the datasheet. We are planning to make this as an e2e FAQ.