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how to simulation PWM small signal model in spice ? thanks.

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vivsim

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i simulated the buck DCDC SSM using spice, PWM using Ridly's model, I compared AC simulation results and Transient results, the two simulation doesn't meet well , i don't know what's wrong, can anyone give me some suggestion ?
i think if change ESR , the loop's phase margin is changed too, but the Transient simulation have not any change
 

follow erickson's method given in the text "fundamentals of power electornics"

Mr.Cool
 

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