UCC28251: Selection of correct topology and IC for DC-DC converter

Tool/software:

Hello Team,

I am planning to use UCC28251 for our application with below requirements:

Topology: Full Bridge (Hard switched)

Input: 660V (Fixed)

Output: 54V

Output power: 50W to 400W variable

Isolation: Yes 3kV

Efficiency>90%

Heatsink for Mosfets: Yes.

For supporting Higher voltage we are using an TI isolated gate driver with UCC28251.

1 .Do you suggest any inputs before we finalize the ICs.

especially because of any IC limitation for high voltage input and impact of hardswitching. 

2. Any references of design.