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This paper delves into the problem of designing a buck converter, serving as the key element for testing sets, also known as load simulators. These simulators impose varying electric load onto power supplies that may be employed in harsh environments and under temperatures below 0 0 C. This provides ground testing for such supplies over a wide range of electric loads as well as creating the proper voltage waveform on the supply terminals. For this purpose, we implement a subordinate control system containing an internal inductor current loop and main output voltage feedback of the buck converter topology. Within the present research frameworks, a methodology of the control system designing, have been outlined. The resulting voltage and current waveforms confirm the correctness of the presented methodology and applicability of the buck converter with subordinate control system as a functional component of load simulators.