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TPS2595: [TPS259541] The part's programmed current limit does not trigger

Hailey Mccurry
Prodigy 30 points
Part Number: TPS2595

Tool/software:

I'm using this model as an efuse for a 12V input and where the circuit will max out at ~1.5A. Since I'm using a 910Ω resistor elsewhere and ~2A is fine, that's what I stuck in the Rilm position, as you can see in the screenshot. however when testing the circuit I'm able to pull up to the part's 4A max current limit without any faulting. It's odd as the resistor does indeed measure the correct value, and a previous more generalized design using a pot works fine-- the encountered current limit maps to the correct resistance. I also want to say I used an excel tool to give a starting design, but the TI web site is giving me a 404 for the part's listed web page so I can't double check...

Did I miss something dumb?

  • +1
    TI__Mastermind 38865 points

    HI Hailey,

    Hailey Mccurry said:
    404 for the part's listed web page so I can't double check...

    Can you try with another browser or refresh. I suspect this might be just a temporary issue as I am able to access the site.

    Regarding your question, if you are simulating, can you share some plots. Also based on schematic, your enable resistive divider will cause abs max violation of EN pin voltage.

    Best Regards,
    Arush

  • +1 in reply to Arush Gupta
    Prodigy 30 points

    For the UVLO yeah I did mix up R1 and R2, but I have no idea where I got the 340k from. I think I might've mixed it up with a resistor divider in something else... As for my original problem, I realized I did indeed make a very stupid mistake and was reading the current draw from a converted 5V later down the chain. Of course the 12V fuse would trip when the 5V output got to ~4A! Thank you for alerting me to the resistor mix up!