I am Using TOP245YN on universal input to get 5V@1A(Floating),15V@1A,12V@1A. With No load on 5V and 15V is Loaded(200mA),its output goes low. I have attached my design. I think i should adjust feedback gains. 5V@1A is used for Logic supply for my design 15V@1A is used for Mosfet Drivers to drive 500V MOSFETS I Want 5V and 15V supply to have no common return, so as to isolate my high voltage power and logic supplies. If any other ideas suggest me.