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[SOLVED] Transient response of DC-DC buck converter

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chandlerbing65nm

chandlerbing65nm

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I am simulating circuit for DC-DC buck converters. I obtained an output (attached image) but I am not sure if this is correct. I will show my circuit and simulations of Gain and Phase margin for the error amplifier and feedback system of my buck converter.

C = 8uF
Resr = 1mohm
l = 10uH
vs = 3V
vo = 1.8V

vramp vramp gnd pwl 0s 0v, 2us 1.8v, 2.0001us 0v, R
vref vref gnd dc 0.9v
3.PNG1.PNG2.PNG
 

Very poor load regulation in the third attachment and
signs of time-domain instability.
 

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