more 100V

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whether it is possible to use a PI chip with an output voltage of more than 100V

Yes it is Possible.What kind of toplogy you are using? What are your Input and Output Specifications.

TNY280, output 1-200v,0.04A;2-200v,0.04A

Do you have two outputs of 200 V? What's your input specification?

Yes 2 output 200V. Uin=150-265V

Yes 2 output 200V. Uin=150-265V

Attached the Transformer spreadsheet for the spec's you mentioned. And also please go through link-Switch TN Design guide and data sheet, The transformer spread sheet is designed using Flyback topology