An accurate average inductor current limit method for peak current mode buck DC-DC converters

被引：2
作者：
Sun, Yufei [1 ,4 ]
Ma, Yanzhao [2 ,3 ]
Cui, Kai [1 ,4 ]
Fang, Song [1 ,4 ]
Yin, Yue [2 ,3 ]
Fan, Xiaoya [1 ,4 ]
机构：
[1] Northwestern Polytech Univ, Sch Software, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Sch Microelect, Xian 710072, Peoples R China
[3] Northwestern Polytech Univ, Qingdao Res Inst, Qingdao 266200, Peoples R China
[4] Northwestern Polytech Univ Shenzhen, Res & Dev Inst, Shenzhen 518057, Peoples R China
来源：
IEICE ELECTRONICS EXPRESS | 2020年 / 17卷 / 06期
基金：
中国国家自然科学基金;
关键词：
current limit; average inductor current feedback; Gm-C filter;
D O I：
10.1587/elex.17.20200047
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
An accurate programmable average inductor current limit method for buck DC-DC converters with peak current mode (PCM) control is presented. A Gm-C filter is used to sense the voltage drop across a current sensing resistor in series with the inductor. Then, the voltage drop is converted into a current signal by a voltage-to-current (V2I) converter. The converted current signal is superposed on the output of the error amplifier to adjust the peak inductor current. The buck converter has been designed with 0.18 mu m BCD process. The current limit value is designed 1A/2A for the sensing resistor of 50m Omega/25m Omega, respectively. When the the equivalent load resistance steps from 10 Omega to 2.5 Omega/1.67 Omega, the simulation results show that the average inductor current increases from 500mA to 0.9A/1.8A for the sensing resistor of 50m Omega/25m Omega, respectively.
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页数：5
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