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try this use tl431 feedback circuit use UFR series output diodes like UF5402 check the transformer design good luck:D regards satya
I use a single output (max. 15V / 10W) SMPS with TNY268 using tl431 for feedback. The core is E20/6 with 1.36mH primary inductance and 24uH for secondary. I think that the primary inductance of your transformer is too small. In the past I tried to design a transformer using PI Expert, but the transformer losses were too big because the primary