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UCC256302: Simulation with Vout=200V

Part Number: UCC256302

Hi,

I have modified the original simulation file to obtain a different output voltage (200V) using the values in the design calculator spreadsheet.

However, the converter doesn't start correctly, it enters in a fault condition (stop and restart 1ms later).

I tried many Ln and Qe value without success. With different values than those given by the spreadsheet I managed to get the converter start correctly though.

I must miss something but i don't know what, can i have some help from TI ? i'd give you my spreasheet and the modified simulation file.

Regards,

Marc