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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 

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

Thanks in advance.