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TPS562201: Part simulation issue

MADHAVI JAGATHA
Prodigy 50 points
Part Number: TPS562201

Tool/software:

Hi,

i have added 18PF cap at VFB pin side.and in next ver i removed it.

i am simulating this in ansys,now i am facing issue is with 18PF it is coming good,and without it is having wrong output.

can you explain me why it is behaving like this.

,

but on physical board it is coming correct. is this cap is critical.

  • 0
    TI__Genius 12020 points

    Hi,

    Add 18pF can help better transient performance, so we recommend to use it. But without this cap, the design should be stable, not sure why it cannot work in simulation. Thanks.