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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