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LM5022: Reference design ASAP

Part Number: LM5022
Other Parts Discussed in Thread: LM51551, PMP9282

I am looking ASAP for a reference design of isolated DC/DC 5V input, 3.3V with 2.5A output.

Readily made bricks I found in this range, are ridiculous expensive (>20$) so we are trying to settle a design for our future product.

The most closest reference design will be this one, using LM5022, but the problem is that minimum input is 6V and we need 5V

http://www.ti.com/tool/PMP9282 

The big question is: can we replace the buck with one that accepts 5V on input?

Thanks in advance.