Modeling of the Control Behavior of Current-Mode Constant On-Time Boost Converters

A constant on-time (COT) controller for dc converters has received much attention recently because of its unique feature of high light-load conversion efficiency. In this paper, a control model is developed for the boost converters with the current-mode COT controller. Models are developed for predi...

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Bibliographic Details
Published inIEEE transactions on industry applications Vol. 52; no. 6; pp. 4919 - 4927
Main Authors Hsu, Yu-Chien, Chen, Dan, Hsiao, Sheng-Fu, Cheng, Hung-Yu, Huang, Chun-Shih
Format Journal Article
LanguageEnglish
Published New York IEEE 01.11.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Boost converter
Circuit stability
compensation design
Control stability
Controllers
Converters
current-mode constant on-time (CMCOT) control
damping ratio
describing function approach
Equivalent circuits
Impedance
Integrated circuit modeling
Load modeling
output impedance
Transfer functions
Transient response
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Summary:A constant on-time (COT) controller for dc converters has received much attention recently because of its unique feature of high light-load conversion efficiency. In this paper, a control model is developed for the boost converters with the current-mode COT controller. Models are developed for predicting the loop stability and the step-load transient response. Based on the model, a compensation design is proposed to achieve desired stability margin and step-load transient response. Simulations and experiments are used to verify the model.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2016.2597280