Design of DC-DC Converter of Single-Transistor Positive Buck Based on MC34063A

Based on the characteristics of switching power supply, this paper, taking MC34063A IC as the research object, has proposed the design, realized design of single-transistor positive buck DC-DC converter through calculation and component selection, and simulated the circuit of the design using Saber software. When the input voltage is 15V~25V, the output voltage has been stabilized within the scope of the 12.181V, with its ripple coefficient being 0.1154%, so it has satisfied the requirements of the design.