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LM5156HEVM-FLY: Soft-start Calculation - secondary side soft-start time

PY (Pengyu) Song
Expert 5860 points
Part Number: LM5156HEVM-FLY

Hi team,

How to calculate the soft-start time? 

  • +1
    TI__Genius 11215 points

    Hello, 

    Thanks for reaching out. We do not have an equation to calculate precisely the secondary side SS time, anyway the time constant is given by the value of C20 and R14 and this SS mechanism kicks in after the one imposed by the cap on the SS pin of the IC. Let me know if further help is needed. 

    Kind regards,
    EM