过电流
电流传感器
限流
电流(流体)
计算机科学
电子工程
控制器(灌溉)
电气工程
信号(编程语言)
可扩展性
放大器
工程类
CMOS芯片
农学
数据库
生物
程序设计语言
出处
期刊:IEEE Journal of Solid-state Circuits
[Institute of Electrical and Electronics Engineers]
日期:2021-09-01
卷期号:56 (9): 2748-2759
被引量:9
标识
DOI:10.1109/jssc.2021.3071728
摘要
This article presents a scalable multiphase peak current-mode Buck controller with sub-milliohm direct current resistance (DCR) current sensing and synchronized overcurrent protection. Low DCR current sensing capability is critical in pursuing high efficiency and precise current balancing. For this purpose, a sub-milliohm DCR current sensing circuit is proposed. The low-frequency current signals from all the phases are amplified by a time-shared amplifier, and the outputs are combined with the exaggerated high-frequency signals, respectively, to rebuild the proportional current sensing signals. The small signal analysis and the design guidelines of the proposed sensing scheme are presented. The proposed current sensing scheme enhances the signal-to-noise ratio, improves the phase to phase current balancing, and dramatically reduces the silicon area of the sensing circuit. A latch-up problem of hiccup mode over current protection in the multi-chip parallel system is addressed in this article. A synchronized hiccup mode over current protection scheme is designed to solve the issue without adding extra communication bus to the system. The proposed controller is fabricated using a 0.6- μm BiCMOS process, and the experimental results prove the effectiveness of the current sensing circuit and protection scheme.
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