The importance of voltage and load stability is emphasized in the analysis of a closed-loop controlled buck converter to deal with disturbances in the output voltage, output current, or load. Our main goal in this research is to monitor the performance of an open-loop buck converter and compare it with its closed-loop counterpart. The choice of a sliding mode control strategy is justified in cases where any disturbance in the system may affect its operation. Our approach, as described in our publication, consists of studying the buck converter in an open loop, performing step response tests in an open loop, varying the load and voltage of the converter, implementing sliding mode control in a closed loop, and checking the stability and voltage of the converter. The effectiveness of the proposed solution to deal with disturbances.