PSpice Modeling Using AC Analysis to Determine Loop Stability

Quickly and accurately checking the stability of your power supply is crucial, and in this video, Kirsch Mackey shows how to do just that using AC sweep analysis in PSpice. Learn how to inject a small AC signal into the feedback loop of your flyback converter to assess loop gain and phase margin in a single simulation, without relying on slow and repetitive transient tests. Using a modified Texas Instruments reference design and an averaged SPICE model, this technique provides deep insight into how your controller reacts to output voltage disturbances and load changes, revealing potential oscillations or instability before they become real-world issues.