transformer heating problem

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i m working on smps (flyback topology)i have designed transformer for that but my transformer core start heating when we contact load to it . it's core temp. goes upto 65'c , i m using top224y in my design. i already check my turns (multiple outputs) and wire gauges which are more then sufficent and also withstand 1.5 times load of actual.

Duplicate posting - please see other post with same title for reply.

Cheers

PI-Chekov