Other Parts Discussed in Thread: UCC256302
Can I use the UCC256402 or UCC256302 for a input power supply 480-620 V DC ?
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The absolute maximum input voltage rating for the UCC256402 700V and the UCC256302 is 640V, but the recommended operating is up to 600V. This is for the HV startup pin. The electrical characteristics table is only guaranteed with the HV pin at 600V as shown below.
So as long as you can be sure that you don't violate the absolute maximum rating of either device, this should work. Above 600V it may not meet all datasheet limits.
I hope this answers your question.