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UCD3138PFCEVM-026: UCD3138 single phase pfc

Part Number: UCD3138PFCEVM-026
Other Parts Discussed in Thread: UCD3138

Hi ,

I have read the document of UCD3138 guide. Could you please specify the controller pin values of Irect_fdbk, Vline_sense, Vbus_fdbk ,Vneu_sense  ??

My power rating is 2KW so I need to change values of resistors and capacitors according to that.

  • Hello,

    Vbus is 390V, R5 =400k, R6 = 1.8k;  Vbus_fb = 1.8/401.8 * 390 = 1.747V;

    You can use the same way to get VLine_sense and VNeu_sense voltage, but the input is varied voltage.

    The Irec_fbbk is similar to VLine_sense and VNeu_sense, but it is the output of current amplifier. To get 2kW, it is needed to reduce the amplifier gain, and make sure the peak voltage of EAP0/EAP1  at the worst case is less than 1.5V (full scale is 1.6V)

    I hope this could help,

    Sean