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AC-DC conversion

Mownika Gudupuru
Intellectual 330 points

Hi,

I want to design a Ac-Dc PFC  converter.  For 230v rms input how to select Vin min and Vin maximum. In general foe any given circuit how to select Vin min  and Vin maximum value??

  • +1
    TI__Genius 11350 points

    Hi Mownika, 

    VIN min and max are the RMS line voltages you expect to see in your application plus a buffer to accommodate variance.  For instance, 85-265V is considered the "universal" line range which covers 100Vac (Japan) to 230Vac (Australia/India) with +/-15% limit variance.  If you're designing for a single source only, such as 230Vac, you may use 195Vac - 265Vac (+/-15%) or modify the buffer to accommodate a wider potential variance.  Generally, you want your circuit to operate across the expected line variation yet take appropriate measures to an under/over-voltage condition.