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LM25085 webench and excel configurator mismatch

andreas kay
Prodigy 20 points
Other Parts Discussed in Thread: LM25085

Dear all,

I created a simulation with "low O/P ripple" (minimum ripple solution solution).

The webench suggest me to use a 10nF cap for Cac .

The excel LM25085 quik start sheet suggest me to use 100nF. This is what also the datasheet tells.

2nd point. I propose to advise the user to take care about the gate resistor. Depending on the used FET, the gate charge current is to high for the LM25085.

with regard Andreas

  • 0
    TI__Intellectual 2155 points

    Hi Andreas,

    I apologize for the delayed response. Thank you for taking the time to bring these points to our attention. I am looking into the WEBENCH calculation for the Cac using the Low O/P ripple option. Regarding your second point, this sounds like something reasonable to implement. I will see if there is something that can be added to the FET selection routine.

    Again, thank you for bringing these items to our attention.