I have been having this problem since I started to design my Fly-Back type voltage converter, and it is that it is throwing me a time step too small error, and I tried to solve it by configuring the options of spice to best convergence, but so far I could not have a solution to my problem, attached I will leave the circuit I am using, it is being powered by a driver for motors to have the necessary current.

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I set the coupling factor to -0.5 it means that the signal in the output of the transformer its dephased 180 from the original.

this circuit is part of a controller for DC-DC converter, but i cant make to work alone


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