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LM34925: Fly-buck design with 3V and 12V output simulation

Part Number: LM34925

I have downloaded the snvm375.tsc design file for simulation in Tina. Now I want to change the transformer/coupled inductor ratio so that I can get 3V (pri) and 12V (sec isolated). How do I do that?

I have used the Calculator_Rev1p03.xlsx spreadsheet but this does not include this component, so I was wondering if there is another that does?