The quality of power conversion represents an important constraint in designing the DC-DC converter for distributed generation (DG) application based on renewable and clean energies. From this point of fact, this paper introduces a full modelling and design steps for a suitable DC-DC buck converter which controlled by a flexible designed sliding mode controller (SMC). Firstly, analyzing, modelling of a buck converter working through a continuous conduction mode (CCM) operation, and collecting the dynamic equations, all are demonstrated in this study. Then, to guarantee a high performance of power conversion function, a new comprehensive steps design of an effective SM controller has proposed to integrate the converter function. The proposed converter with the SMC controller are simulated and tested using Simulink of MATLAB software. The collected simulation results of resistive load voltage, current, and power are harvested for different load levels with varying the input DC link voltage. The shape and levels of load testing parameters through source voltage and load variation are promising and confirming the quality and the effectiveness of the presented converter and controller.