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UCC2897A: https://www.ti.com/lit/tsc/slum606

Part Number: UCC2897A
Other Parts Discussed in Thread: TL431

I am working on designing the Isolated converter of 48V/14V  using UCC2897A. I was simulating the TINA model available on the website. 

Even with the changed values for the required specifications output is not reaching 14V. 

Below are the changes I did and tried simulating.

1) Resistor divider values for TL431

2) Transformers turns ratio

3) Even with the above-made changes, I am unable to get the required output voltage. I added a resistor divider and given the voltage at the feedback pin between (2.5V to 5V). even then voltage doesn't reach to 14V.

I even tried replicating the design available in the below-mentioned link. but I was using diodes instead of Mosfets on the secondary side.

Please help me with the issue.