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LM51231 Buck convertor convergence problems

I designed a boost convertor using the LM51231. I used the spreadsheet tool to calculate the component values for 400W convertor, 12Vin, 50Vout.

I am trying to simulate a bust convertor using a LM51231, but I am having convergence problems with it. I have played with some of the simulator settings with no success.

Any suggestions would be greatly appreciated.