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recommend DCDC design

Hi sir

our customer want to design above project about power, could you recommend suit for this Application IC and reference design,tks!

1: The input is 36~75VDC, the output power is 400W, 600W, 800W.
2: The input is 18~75VDC ultra-wide voltage input, and the power is 400W, 600W, 800W, which circuit topology is better.