一种应用于低压差线性稳压器的新型折返限流电路 -- 西北工业大学学报,2015,33(6):1035-1040
论文:2015,Vol:33,Issue(6):1035-1040
引用本文:
刘晨, 来新泉, 刘从, 王宏, 张帆. 一种应用于低压差线性稳压器的新型折返限流电路[J]. 西北工业大学学报
Liu Chen, Lai Xinquan, Liu Cong, Wang Hong, Zhang Fan. Design of a New Foldback Current-Limit Circuit in Low-Dropout Linear Regulator[J]. Northwestern polytechnical university

一种应用于低压差线性稳压器的新型折返限流电路
刘晨1,2, 来新泉1, 刘从1, 王宏2, 张帆3
1. 西安电子科技大学 CAD研究所, 陕西 西安 710071;
2. 空军工程大学 防空反导学院, 陕西 西安 710051;
3. 中国人民解放军 空军93861部队, 陕西 三原 713800
摘要:
针对大功率负载的电源管理芯片容易出现过载、短路问题,提出一种利用采样电流转化为采样电压的限流模式折返保护电路。该电路限流环路利用缓冲器双支路实现实时控制,其工作状态随输入电压有所转变,hspices仿真实验验证了该电路限流值稳定,基本不随着电源电压的变化而变化,而且芯片的短路功耗降低60%。采用联华电子公司0.5 μm 5 V的CMOS工艺线在低压差线性稳压器(LDO)中进行了投片验证,实测芯片常值限流200 mA、折返限流80 mA,自身静态电流极低仅2 μA左右。投片测试结果表明,该电路起到保护作用的同时,符合现代电源管理芯片对高效率低功耗的要求。
关键词:    暂态分析    实时控制    电流限制    折返电路    低压差线性稳压器   
Design of a New Foldback Current-Limit Circuit in Low-Dropout Linear Regulator
Liu Chen1,2, Lai Xinquan1, Liu Cong1, Wang Hong2, Zhang Fan3
1. Institute of Electronic CAD, Xidian University, Xi'an 710071, China;
2. Key Lab of High-Speed Circuit Design and EMC, Ministry of Education, Xidian University, Xi'an 710071, China;
3. PLA, No.93861 Troop, Sanyuan 713800, China
Abstract:
A new circuit that transfer sensing current into sensing voltage under a current limiting mode with foldback protection system, is presented in this paper, implemented in 0.5μm 5V CMOS process and verified by Cadence and Hspice simulation. Experimental result verifies that the maximum current limit of the proposed LDO is set to be 200mA, and the foldback current limit is 80mA. Thus, the power consumption of the chip can be saved up to 60% at the foldback circuit condition, which also decreases the risk of damaging the power transistor and makes it widely used in all kinds of power management of microprocessors, moreover, the circuit features simple structure and low quiescent power consumption.
Key words:    Transient analysis    Real time control    Current Limiter    Foldback circuit    Low Linear dropout regulator (LDO)   
收稿日期: 2015-04-28     修回日期:
DOI:
基金项目: 国家自然科学基金(61106026)与中央高校基本业务费(K2014408201)资助
通讯作者:     Email:
作者简介: 刘晨(1977—),空军工程大学讲师,主要从事电路与系统专业研究。
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