This paper presents a detailed examination of the design and simulation of a robust sliding mode control system for a flyback converter. Sliding mode control is a nonlinear approach aimed at driving the system state onto a specific sliding surface and maintaining it there, independent of uncertainties or disturbances. The paper also explores the working principle of the proposed converter. Furthermore, the paper extensively discusses the modeling of the flyback converter under various conditions, taking into consideration different scenarios to accurately represent its behavior. To achieve sliding mode control, the converter's state space averaged (SSA) model is also thoroughly explained. Finally, the simulation results demonstrate that the output voltage of the fly-back converter remains nearly constant even in the presence of significant changes or disturbances at the input side. This underscores the effectiveness of the sliding mode control technique in ensuring a stable output voltage under varying operational conditions.