Title: Fast Transient (FT) Technique With Adaptive Phase Margin (APM) for Current Mode DC-DC Buck Converters
Authors: Lee, Yu-Huei
Huang, Shao-Chang
Wang, Shih-Wei
Chen, Ke-Horng
電控工程研究所
Institute of Electrical and Control Engineering
Keywords: Adaptive phase margin (APM);fast transient (FT);loop bandwidth;pole-zero cancellation;stability
Issue Date: 1-Oct-2012
Abstract: This paper proposes a fast transient (FT) control with the adaptive phase margin (APM) to achieve good transient response in current-mode DC-DC buck converters at different load conditions. The overshoot/undershoot voltage and the transient recovery time are effectively reduced. The APM control can always maintain the system phase margin at an adequate value under different load conditions. That is, the compensation pole-zero pair is adapted to load current to extend the system bandwidth and get an adequate phase margin. Experimental results show the overshoot/undershoot voltage is smaller than 60 mV (3%) and transient period is smaller than 12 mu s as load current suddenly changes from 100 to 500 mA, or vice versa. Compared with conventional designs without any fast transient technique, the undershoot voltage and recovery time are enhanced by 45% and 85%, respectively.
URI: http://dx.doi.org/10.1109/TVLSI.2011.2163093
http://hdl.handle.net/11536/16840
ISSN: 1063-8210
DOI: 10.1109/TVLSI.2011.2163093
Journal: IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS
Volume: 20
Issue: 10
Begin Page: 1781
End Page: 1793
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