DOI: 10.3724/SP.J.1146.2013.00293

Journal of Electronics & Information Technology (电子与信息学报) 2013/35:12 PP.3018-3023

Dynamic Width Controller for Switch Mode DC-DC Converter

A Dynamic Width Controller (DWC) for switch mode DC-DC converter is designed. Based on the comparison result of the sensed load current and the internal reference current, the controller can select the optimum switch width and drivers for the DC-DC converter according to the load current condition. The controller can improve the efficiency of DC-DC converter for high switching frequency and light load applications. The chip adopts a low power cost Voltage-Current Converter (VCC) to provide load current information for the DWC. To ensure the security of the chip’s performance, protection circuits are also integrated. The chip is simulated and fabricated under standard 0.35 µm CMOS process. The experiment results show that the proposed circuit can achieve dynamic switch width control for the DC-DC converter, and the maximum efficiency improvement is 6% for light load condition.

Key words:DC-DC converter,Dynamic Width Control (DWC),Switch mode

ReleaseDate:2014-07-21 17:01:12