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WEBENCH® Tools/LM3478: LM3478 SEPIC design in Webench Rramp, Cramp not specified

Mark Pearson
Genius 12705 points
Part Number: LM3478

Tool/software: WEBENCH® Design Tools

LM3478_SEPIC.pdfOne of my customers ran an LM3478 SEPIC design on Webench and noticed some oddities.

1st Oddity: Cram and Rramp are not specified.

2nd oddity: Rbp (hanging off of the VIN node) is not connected at one end. I believe it should be connected to the power source.

Thought you might like to know.

  • 0
    TI__Guru* 78440 points
    Hi Mark,

    I don't know why it is labled Cramp and Rramp. They are RC filter for the current sense and the names are kind of misleading. Anyway, they are usually 1k/100pF, or 100 Ohm/ 1000pF.

    Regarding Rbp, yes it should connect to the input rail. This is surely the problem when webench export the design.

    Anyway, I will notify the webench group.

    Thanks,
    Youhao