A Digitally Controlled Single-Inductor Dual-Output Buck Converter with Low Cross-Regulation and Fast Dynamic Response

In this paper, a new digitally controlled single-inductor dual-output (SIDO) converter is proposed to improve the performance during the transient process. A SIDO buck converter operating in continuous conduction mode (CCM) is taken as an example to analyze the operation. The proposed digital control method consists of an inductor current predictive control method and an equivalent zero-charge method, which can suppress the cross-regulation and reduce the response time, respectively. The proposed digital control method is implemented via the field programmable gate array (FPGA) platform. Compared with the traditional proportional-integral-derivative (PID) control method, the response time is reduced from 5 ms to 10 us, and the cross-regulation is reduced from 1.27 mV/mA to 0.055 mV/mA when the load current changes from 180 mA to 360 mA.

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