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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?

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

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should I left the second output of the transformer empty or connect a load to it?

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.

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Well, that depends on what the second output is for. There aren't two equal transformer in the world.

Often the second winding is for auxiliary bias but it could be a reset winding or a second output. Unless you know how it's wound you can't say for sure.

In doubt keep it open

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