Comprehensive Analysis and Design of Current-Balance Loop in Constant On-Time Controlled Multi-Phase Buck Converter

被引：13
|
作者：
Chen, Ching-Jan [1 ]
Zeng, Zih-Yuan [1 ]
Cheng, Ching-Hsiang [1 ]
Lin, Fu-To [2 ]
机构：
[1] Natl Taiwan Univ, Dept Elect Engn, Taipei 10617, Taiwan
[2] Richtek Technol Corp, Hsinchu 30288, Taiwan
来源：
IEEE ACCESS | 2020年 / 8卷
关键词：
Multi-phase converter; constant on-time (COT) control; current-balance; small-signal model; VOLTAGE REGULATOR MODULE; SMALL-SIGNAL MODEL; EFFICIENCY;
D O I：
10.1109/ACCESS.2020.3029069
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Constant on-time (COT) controlled multi-phase buck converter has been widely used in high-current applications such as computing devices to achieve high entire-load-range efficiency. However, the literature lacks comprehensive analysis and design guide of the current-balance loop in COT control, resulting in possible low efficiency, per-phase current protection false-trigger, and stability issue. To solve the aforementioned issues, dc inductor current equations and small-signal models are proposed for COT control with the current-balance loop. Current-balance loop gain design guideline is then proposed to achieve accurate dc current balance and stability. Experiment and simulation results verify the analysis and the accuracy of the proposed models.
引用
收藏
页码：184752 / 184764
页数：13
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