Buck Converter with Loop Gain Analysis
This demonstration shows how to perform a Steady-State Analysis and obtain the loop gain of a voltage-regulated buck converter with a resistive load. For detailed information see this tutorial.
A demonstration of using small-signal analyses to obtain different open-loop transfer functions for an unregulated buck converter is given in the demo model Buck converter with Analysis Tools.

To run an analysis, choose Analysis tools... from the Simulation menu, then select an analysis from the list and click Start analysis.