Isolated power supply solution

Hello Jerry, 

I suggest you use our WEBENCH tool for your power supply design:  https://webench.ti.com/power-designer/switching-regulator/select . Using the parameters you provided, there are 10 designs created; you can sort these designs by your most important criteria, such as cost, size, efficiency, etc.

Once you have created and selected a design, if any further questions, please come back to E2E.

Regards, 

~Leonard