Title :
A MOS current-mode buck DC-DC Converter with a 240-kHz loop bandwidth and unaltered frequency characteristics using a quadratic and input-voltage-dependent compensation slope
Author :
Sugimoto, Yasuhiro
Author_Institution :
Dept. of Electr., Electron., & Commun. Eng., Chuo Univ., Tokyo, Japan
Abstract :
In this study, we verified that a quadratic slope was the best-fit compensation slope for the current feedback loop of a current-mode DC-DC converter by considering the stability of the inductor current when the current disturbance was applied. We also verified that the introduction of the input voltage dependency to the quadratic slope enabled the frequency characteristics of the current feedback loop to remain completely constant without depending on the input and output voltage change of a DC-DC converter. The test chip of a MOS current-mode buck DC-DC converter using a 0.35-mum CMOS process and a 5-MHz clock realized two loop frequency bandwidths of 130 kHz and 240 kHz and was operated in two different input and output voltage settings for each frequency bandwidth. As a result, the unaltered gain and phase frequency characteristics were obtained for two different settings in each frequency bandwidth.
Keywords :
CMOS integrated circuits; DC-DC power convertors; circuit feedback; compensation; current-mode circuits; power integrated circuits; CMOS process; MOS current-mode buck DC-DC Converter; bandwidth 130 kHz; bandwidth 240 kHz; current feedback loop; input-voltage-dependent compensation slope; quadratic compensation slope; size 0.35 mum; unaltered frequency characteristics; Bandwidth; CMOS process; Clocks; DC-DC power converters; Feedback loop; Frequency conversion; Inductors; Stability; Testing; Voltage;
Conference_Titel :
ESSCIRC, 2009. ESSCIRC '09. Proceedings of
Conference_Location :
Athens
Print_ISBN :
978-1-4244-4354-3
DOI :
10.1109/ESSCIRC.2009.5325976
