SPICE can be a d.o.g (seriously, that's censored on this forum?) for these switching power supplies, so I'd say in your transient simulation command, add a max timestep well below your switching period and add 'uic' on the end of the line. Remember to include the ESR of the output cap and any load resistance. You can derive a linear model of the buck converter to stabilise it with equations in voltage sources etc and then when you add the transformer, add it in as a turns ratio in the equations, or you can derive a Bode plot of the plant by hand on paper with the equatrions, it's not complicated. Ressmps, I'd advise getting a behavioral model of your secondary side working as a buck converter first with ideal opamps, switches, diodes and latches, then add the transformer, then add the isolation. Unfortunately, I can't load it from work anymore but, assuming its the right file, somewhere in there is a type III compensation design guide with a zener regulated secondary aux supply.
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