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

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