1.Ineed to design a dc-dc isolated converter with input range 18-32 input voltage , output is 28V /4A . Effieciency of 90% .
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Anjali,
Please take a look at PMP7294 and PMP6943 for two options for this application. PMP6943 is a flyback topology using the TPS40210 and PMP7294 is a forward topology using the UCC2897A. The forward topology has higher efficiency.
Best Regards,
Anthony