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Circuit not simulating buck converter

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RITESH KAKKAR said:
It is in your images alos first it go high then down then up why this happen?
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The inductor, output capacitor, and load resistor form an under-damped resonant circuit (suggest you look up resonant circuits if you don't understand that).
The initial transient is just the overshoot and settling of that resonant circuit to the step-input from the start of the simulation.

In a normal buck regulator there is a feedback loop with compensation to cancel the effects of that output resonance so there is no output overshoot or ringing in its operation.
 

ok, the output will be feed to gate or where?
in ID there will opamp with capacitor.
 

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