Control Loop Architectures for High-Frequency Switching-Mode DC-DC Buck Converters

This paper tackles the issue of control loops in high-frequency switching-mode DC-DC buck converters for post-regulation in automotive applications. Two different control loop implementations, designed in a 120-nm BCD process, are proposed and verified through simulations. Both solutions exploit the advantages of standard voltage mode control (VMC), while improving the transient response by including a one cycle (OC) and a feed forward (FF) loop, respectively. The OC VMC loop achieves 0.92 mV/V line regulation and 0.6 mV/A load regulation, whereas the FF VMC attains 0.17 mV/V line regulation and 4.8 mV/A load regulation, thus both outperforming the state-of-the-art of high-frequency switching-mode buck converters.