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UCC28070A: Calculation sheet sluc114

Part Number: UCC28070A
Other Parts Discussed in Thread: UCC28070

Hello.

I have a question about UCC28070.

I am considering UCC28070.

Calculation sheet sluc114 (UCC 28070 Design Tool 8 15 08. xls)
I think that I want to use, but the input voltage is fixed at 85V - 264V.
We are thinking at 170V-264V.
Why is the input fixed?
Is there a TOOL that can change the input voltage?

Thank you.