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This study presents the analysis, design and voltage regulation of a zero-voltage switching quasi-resonant DC-DC converter with low switching losses for applications requiring constant power supply. In order to increase the power packing density, a simple control method using an analogue resonant controller UC3861 is used to regulate the output voltage against load variations and supply disturbances. The performance of the controller is verified by developing a prototype model of the converter and experimental results are presented. Also it is observed that the converter provides maximum efficiency of 93.5- at full load.