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Thread: Help.. Rectifier -48V 42A PFC L4981AD Mod

  1. #1

    Help.. Rectifier -48V 42A PFC L4981AD Mod

    Hai all, i have a smps Rectifier -48V 42A using PFC L4981AD, is there a way to modify be an adjustable voltage output...? Thanks all.....

  2. #2
    diysmps Member
    Join Date
    Sep 2012
    L4981AD is PFC controller only.
    After it must be an isolated step-down converter from maybe 400V PFC output to 42V output. Here must be a controller that have one current loop and one voltage/ or at least limiting maximum voltage.
    Need to know what controller is in step-down converter and looking for schematic to see how modify output voltage.

  3. #3
    thanks bro, i'll try to trace it...

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