Analysis and Design of a Current-Mode PWM Buck Converter Adopting the Output-Voltage Independent Second-Order Slope Compensation Scheme
Summary :
In this paper, we propose the use of second-order slope compensation for a current-mode PWM buck converter. First, the current feedback loop in a current-mode PWM buck converter using a conventional slope compensation is analyzed by the small-signal transfer function. It becomes clear that the stability and frequency bandwidth of the current feedback loop is affected by the external input voltage and the output voltage of the converter. Next, the loop with second-order slope compensation is analyzed, and the result shows that the loop becomes unconditionally stable with the adoption of second-order slope compensation with appropriate parameter values and a current sensing circuit whose current is sensed across an impedance that is inversely proportional to the input voltage. In order to verify our theory, we designed whole circuits of a current-mode PWM buck converter including the new inductor current sensing circuit and the second-order voltage generator circuit using device parameters from the 0.6 µm CMOS process. The circuit simulation results under the conditions of 4 MHz switching frequency, 3.6 V input voltage and 2.4 V output voltage are presented.
- Publication
- IEICE TRANSACTIONS on Fundamentals Vol.E88-A No.2 pp.490-497
- Publication Date
- 2005/02/01
- Publicized
- Online ISSN
- DOI
- 10.1093/ietfec/e88-a.2.490
- Type of Manuscript
- Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
- Category
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Hiroki SAKURAI, Yasuhiro SUGIMOTO, "Analysis and Design of a Current-Mode PWM Buck Converter Adopting the Output-Voltage Independent Second-Order Slope Compensation Scheme" in IEICE TRANSACTIONS on Fundamentals,
vol. E88-A, no. 2, pp. 490-497, February 2005, doi: 10.1093/ietfec/e88-a.2.490.
Abstract: In this paper, we propose the use of second-order slope compensation for a current-mode PWM buck converter. First, the current feedback loop in a current-mode PWM buck converter using a conventional slope compensation is analyzed by the small-signal transfer function. It becomes clear that the stability and frequency bandwidth of the current feedback loop is affected by the external input voltage and the output voltage of the converter. Next, the loop with second-order slope compensation is analyzed, and the result shows that the loop becomes unconditionally stable with the adoption of second-order slope compensation with appropriate parameter values and a current sensing circuit whose current is sensed across an impedance that is inversely proportional to the input voltage. In order to verify our theory, we designed whole circuits of a current-mode PWM buck converter including the new inductor current sensing circuit and the second-order voltage generator circuit using device parameters from the 0.6 µm CMOS process. The circuit simulation results under the conditions of 4 MHz switching frequency, 3.6 V input voltage and 2.4 V output voltage are presented.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e88-a.2.490/_p
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@ARTICLE{e88-a_2_490,
author={Hiroki SAKURAI, Yasuhiro SUGIMOTO, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Analysis and Design of a Current-Mode PWM Buck Converter Adopting the Output-Voltage Independent Second-Order Slope Compensation Scheme},
year={2005},
volume={E88-A},
number={2},
pages={490-497},
abstract={In this paper, we propose the use of second-order slope compensation for a current-mode PWM buck converter. First, the current feedback loop in a current-mode PWM buck converter using a conventional slope compensation is analyzed by the small-signal transfer function. It becomes clear that the stability and frequency bandwidth of the current feedback loop is affected by the external input voltage and the output voltage of the converter. Next, the loop with second-order slope compensation is analyzed, and the result shows that the loop becomes unconditionally stable with the adoption of second-order slope compensation with appropriate parameter values and a current sensing circuit whose current is sensed across an impedance that is inversely proportional to the input voltage. In order to verify our theory, we designed whole circuits of a current-mode PWM buck converter including the new inductor current sensing circuit and the second-order voltage generator circuit using device parameters from the 0.6 µm CMOS process. The circuit simulation results under the conditions of 4 MHz switching frequency, 3.6 V input voltage and 2.4 V output voltage are presented.},
keywords={},
doi={10.1093/ietfec/e88-a.2.490},
ISSN={},
month={February},}
Copy
TY - JOUR
TI - Analysis and Design of a Current-Mode PWM Buck Converter Adopting the Output-Voltage Independent Second-Order Slope Compensation Scheme
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 490
EP - 497
AU - Hiroki SAKURAI
AU - Yasuhiro SUGIMOTO
PY - 2005
DO - 10.1093/ietfec/e88-a.2.490
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E88-A
IS - 2
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - February 2005
AB - In this paper, we propose the use of second-order slope compensation for a current-mode PWM buck converter. First, the current feedback loop in a current-mode PWM buck converter using a conventional slope compensation is analyzed by the small-signal transfer function. It becomes clear that the stability and frequency bandwidth of the current feedback loop is affected by the external input voltage and the output voltage of the converter. Next, the loop with second-order slope compensation is analyzed, and the result shows that the loop becomes unconditionally stable with the adoption of second-order slope compensation with appropriate parameter values and a current sensing circuit whose current is sensed across an impedance that is inversely proportional to the input voltage. In order to verify our theory, we designed whole circuits of a current-mode PWM buck converter including the new inductor current sensing circuit and the second-order voltage generator circuit using device parameters from the 0.6 µm CMOS process. The circuit simulation results under the conditions of 4 MHz switching frequency, 3.6 V input voltage and 2.4 V output voltage are presented.
ER -
English
