UC3842: UC3842

2-switch only divides the primary voltage between 2 switches vs 1. This may distribute the primary switching loss between 2 MOSFETs but you still are using only Q1 of the flyback transformer and you still have too much power (my opinion) to process on the secondary side for the flyback topology...but if you can deal with the output rectifier thermal/heat and the huge amount of RMS AC ripple current dumping into your output capacitors then you will achieve your goal.

A double-ended bridge topology that uses an output LC filter (buck derived isolated topology) would be my choice. Your design specs seem good for a PSFB topology.

Steve

Dear chandrasekaran,

Typically Single switch flyback used upto 120W Power level, and 2 switch flyback used 100W to 200W power level.

Beyond this power Level Magnetizing inductance & Leakage Inductance plays a role. Since Flyback Transformer is Coupled Inductor, Energy stored in Inductor is 0.5Lm*Im^2 & time constant is constraint factor, thats why it is not recommended for higher Power level. you can try solving this problem by Innovative design in Magnetics one problem solved. then you may use UC3842 IC with capable of handling good thermal design & snubber circuit at secondary side

Hope its clear

Thank you

venkatesh