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Is there any problem if we leave one of the secondaries in a flyback converter floating? I have two secondaries: 24V & 18V. My application needs only 24V. What happens if the 18V winding is left floating?

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    \$\begingroup\$ For EMI reasons, I would at least connect one of the winding outputs to the sec. side ground so that only the hot terminal is left unconnected. \$\endgroup\$ Commented Mar 11, 2021 at 11:50

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What happens if the 18V winding is left floating?

All windings will float - that's the beauty of a flyback design so, if in fact you mean you want to leave the 18 volt winding unconnected to anything then...

There shouldn't be any problem in a standard flyback circuit providing that the 24 volt output is properly connected and, the feedback stabilization is from the 24 volt DC output.

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