Abstract: The Buck converter is widely used in communication, automotive electronics and industrial automation equipment due to its high steady-state accuracy and fast dynamic response. To further optimize its dynamic performance and output voltage programmability, this study developed a Buck power supply based on DSP digital control. The paper first analyzed the topology and working mode of the BUCK circuit, and completed the design and selection of the peripheral circuit based on the performance parameters; then, it deeply studied the characteristics of the control loop and designed the compensation network; finally, an experimental platform based on TMS320F28335 as the control core was built to verify the feasibility of the proposed scheme.