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Digital controller design for point-of-load DC-DC converters with variable switching frequency

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4 Author(s)
Priewasser, R. ; Networked & Embedded Syst., Univ. of Klagenfurt, Klagenfurt, Austria ; Agostinelli, M. ; Marsili, S. ; Huemer, M.

Presented is a digital controller to regulate a point-of-load Buck converter. The regulator varies both the duty cycle, as well as the switching frequency, by controlling not only the on-time, 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 analogue-to-digital converter, has been integrated in a 0.13 μm CMOS technology.

Published in:

Electronics Letters  (Volume:47 ,  Issue: 6 )