Real-time digital control of synchronous buck converter for low-power application

Abstract

This paper presents a real-time digital control of the DC−DC synchronous buck converter. A TMS320F288069 M DSP microcontroller is used for real-time regulation via serial communication and controlled through the MATLAB Simulink. This allows buck regulator power control system without the actual buck regulator main control loop which is normally achieved by the integrated chip (IC). The synchronous buck converter presents the advancement in converter part with synchronous MOSFETs, advancement in control part with programmable DSP controller and in communication part with low-cost GUI and easy implemented RS232. The GUI is designed for desired range of voltage and switching load. The converter’s output voltage is dynamically adjustable from 0 to 5.5 V, while capable of supplying a maximum load current of 6 A from an input supply of 9–12 V.