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UC1846: uc1846

Part Number: UC1846

Tool/software:

Hello:

I am stuck with tis simulation using UC1846 controller: with a feedback divider set to give 5*(1+3.73), no matter what transformer ratio I input, cannot get correct output.

In addition, cannot get even ~ 17v if I change power input to 60v instead of 48v

Any clarification will be highly appreciated.

See attached TINATI file

UC1846RG_TRANS3fdbk.TSC

-r