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Original question:

LM5118 WEBENCH Design simulation Failed

LM25118-Q1: CSD17309Q3 MOSFET issue

anas abukhadir
Prodigy 30 points
Part Number: LM25118-Q1
Other Parts Discussed in Thread: LM25118, CSD17309Q3

hallow TI, I have some problem with LM25118Q1MH/NOPB buck boost circuit from Webench, every thing working good but CSD17309Q3 MOSFET which is the boost MOSFET damaged in many board almost in 30% of the boards in nonunderstanding way spatially after short circuit, which I think LM25118 can handle it, dose that mean I need short circuit protection in may circuit or what.

thank you

  • 0
    TI__Mastermind 42161 points

    Hi Anas,

    the sense resistor connected to CS and CSG does already provide short circuit protection but you also need to dimension the whole circuit for the set max current before the over current protection does kick in. And for that load the full circuit need to be designed. Based on that also the heat generated in the various components needs to be handled and distributed through the PCB or other head sinks.

    So have you checked what heat (losses) will be generated in the FET and that you have enough copper area on the FET to get the heat dissipated.

    Best regards, 

     Stefan

  • 0 in reply to Stefan Schauer
    TI__Mastermind 42161 points

    Hi Anas,

    I have not seen an update for the last 13 days, so I assume the questions are/or answered and the issue is solved.
    I close this thread now. If there is still something open reply and the thread will get open again.
    If you have any other question or of the thread gets locked, please open a new one.

    Clicking the Resolved Button also helps us to maintain this forum.

    Best regards,

    Stefan