Fast transient (FT) technique with adaptive phase margin (APM) for current mode DC-DC buck converters

  • Authors:

  • Yu-Huei Lee;Shao-Chang Huang;Shih-Wei Wang;Ke-Horng Chen

  • Affiliations:

  • Institute of Electrical Control Engineering, National Chiao Tung University, Hsinchu, Taiwan;Institute of Electrical Control Engineering, National Chiao Tung University, Hsinchu, Taiwan;Institute of Electrical Control Engineering, National Chiao Tung University, Hsinchu, Taiwan;Institute of Electrical Control Engineering, National Chiao Tung University, Hsinchu, Taiwan

  • Venue:
  • IEEE Transactions on Very Large Scale Integration (VLSI) Systems
  • Year:
  • 2012

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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 m V (3%) and transient period is smaller than 12 µs 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.