Apply Vcc to Bipolar Supply

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Sorry for newbie question, this is my first time designing a switching supply. I am looking to make a bipolar supply, with positive and negative rails referenced to ground. Is there any easy way to apply the Vcc for a PFC chip referenced to the negative rail of a bipolar switching supply? Thanks in advance.

Hi JC,

Do you have a certain application for such design?

Regards,

Leo