一种适用于降压DC-DC的改进型电流检测电路

基于电流模式控制能够较好地改善DC-DC的性能，设计一种适用于降压DC-DC的改进型电流检测电路，所提出的电流检测电路提高了电流感应的速度和精度。通过对电路的理论分析与设计，采用SMIC0．18μmCMOS工艺模型，利用Cadence工具对电路进行仿真验证，所提出的电流检测电路在负载电流为50mA~500mA时都能够达到96％的效率以及小于40ns的建立时间。在开关频率为2MHz时，输入电压范围为2．5V-4．2V，所需电感值为4．7μH，电容值为10μF，输出电压纹波小于18mV。...

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Bibliographic Details
Published in电子技术应用 Vol. 40; no. 9; pp. 41 - 43
Main Author 池上升 胡炜 樊明辉 吴嘉士
Format Journal Article
LanguageChinese
Published 福州大学物理与信息工程学院福建省集成电路设计中心,福建福州,350003 2014
Subjects
DC-DC
电流检测
电流模式控制
DC-DC
current-mode control
电流检测
current sensing
电流模式控制
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ISSN0258-7998

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Summary:基于电流模式控制能够较好地改善DC-DC的性能，设计一种适用于降压DC-DC的改进型电流检测电路，所提出的电流检测电路提高了电流感应的速度和精度。通过对电路的理论分析与设计，采用SMIC0．18μmCMOS工艺模型，利用Cadence工具对电路进行仿真验证，所提出的电流检测电路在负载电流为50mA~500mA时都能够达到96％的效率以及小于40ns的建立时间。在开关频率为2MHz时，输入电压范围为2．5V-4．2V，所需电感值为4．7μH，电容值为10μF，输出电压纹波小于18mV。
Bibliography:Based on the current-mode control can improve the performance of the DC-DC buck converter, this paper proposes a modified current-sensing circuit for DC-DC buck converter, which enhances the sensing speed and the sensing accuracy of the current sensor. Through the theoretical analysis of the circuit and Cadence simulation with SMIC 0.18 μm process, the proposed peak current-sensing circuit can achieve sensing accuracy of 96% and settling time of less than 40 ns under the condition of the load current 50 to 500 mA. The DC-DC buck converter operates at the switching frequency of 2 MHz, the supply voltage ranges from 2.5 to 4.2 V, the output ripple voltage is less than 18 mV with a 4.7 μH off-chip inductor and a 10 μF off-chip capacitor.
Chi Shangsheng, Hu Wei, Fan Minghui, Wu Jiashi （Fujian Integrated Circuit Design Center, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350003 ,China）
DC-DC ; current sensing ; current-mode control
11-2305/TN
ISSN:0258-7998