# Unused output of a flyback transformer

I have a flyback transformer. It has 2 outputs. I'm going to use one of them on a flyback converter.

Should I leave the second output of the transformer unconnected or connect a load to it?

• It's usually a good idea to connect one end of any unused secondary somewhere, typically GND. Mar 22, 2021 at 14:14

If it's no problem, leave it open circuit or, if it's the same voltage as the other secondary, you should be able to parallel them up to reduce $$\I^2R\$$ losses in the secondary.