[EE] Synchronous Buck

[Manu Abraham]

Hi,

Wondering whether someone with LT Spice experience can be of help.

I have the following Schematic:
https://unsee.cc/fab8911f/

which results in the following waveforms:
https://unsee.cc/c321f970/

The input is a PWM with 50% Duty. If I disconnect the output Inductor,
I am able to see the expected PWM waveform with 50% Duty and thus the
output voltage. With the inductor connected, the output voltage seems
weird.

Schematic without Inductor
https://unsee.cc/8d2dfa8d/

Waveform without inductor
https://unsee.cc/564a9cb2/

Can someone explain, what I am doing wrong ?

Thanks,
Manu