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UCC28740: The transformer design when using UCC28740

Part Number: UCC28740

Hello, I would like to design a flyback topology using UCC28740 and the efficiency of the topology should be as high as possible.

Some parameters are as follows:

Vin =350V~390V DC,

Vout= 48V

Iout=A

Here are the transformer calculations:

1. Will Ippmax changes when the switching frenquecy changes? If yes, then how will Ippmax change?

2. When the switching frequency goes down to 30kHz, is Npri= 56 enough for the topology?

2. Do you think it's OK to design the topology and could you pls give some comments and guidance or help to correct it?

Thanks!