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Digital Controller Design for Point-of-Load DC-DC Converters with Variable Switching Frequency

, , , and . IET Electronics Letters, 47 (6): pp. 374-375 (March 2011)

Abstract

This letter presents a digital controller to regulate a Point-of-Load (PoL) Buck converter. The regulator varies both the duty cycle, as well as the switching frequency, by controlling not only the ontime, but also the off-time of the switching period. The multi-loop digital controller, which achieves a tight voltage regulation and an excellent dynamic performance, is presented and its effectiveness is proven by means of experimental results. The controller architecture, together with an analog-todigital converter (ADC), has been integrated in a 0.13 μm CMOS technology.

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