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A method for improving heavy-to-light load transient response in low-power switch-mode power supplies is presented in this paper. It relies on the utilization of a 3-level 5-switch buck converter and a digital controller with an extended duty ratio control value. The method is experimentally verified with a 6 V to 1.3 V, 400 kHz, 8 W digitally controlled system showing 3 times faster response than that of a conventional buck.
Date of Conference: 21-25 Feb. 2010