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I am working on SMPS 72W with universal ac input 230 V rated , 12 V vout
by using TOP271jx ic
Plz,suggest me reference material to calculate transformer losses & output diode in smps design.

Hi Kumar,

Great to know your interest in PI parts. There are many design examples at various power levels using TOPswitch family devices. Please check design examples listed under TOPswitch section. I recommend to follow below link for 70W design. The output voltage is 24V instead of 12V, so transformer turns ratio will be different.
Please use PI expert for transformer design calculations. It is very use friendly tool available online for all the PI family products.
Open PIexpert online and select top switch family, input all the parameters. The tool will suggest different transformer sizes and optimize the design.
All the best.