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LM25118 application problem

Jericho Tsai
Intellectual 380 points
Other Parts Discussed in Thread: LM25118

Hi Sir,

LM25118 can support VIn :19V/ Vout: 24V/3A?

i used webench to simulation have some wrong message pls reference to below.

Do you have any suggest for this application?

Thanks

  • 0
    TI__Mastermind 21720 points

    Jericho,

    The design of VOUT=24V is possible.

    The warning is just saying that the control loop phase margin is too low to account for design variances. These variances include temperature, part tolerances and parasitics. If the phase margin is less than or equal to 0 the system will become unstable.

    The compensation components need to be changed to add more phase margin. The datasheet gives some guidelines for this and also the quick start calculator will help with playing around for a rough estimate of the values. 

     -Garrett