A fixed-frequency fast transient response DC-DC controller for VRMs

A 2V-10A fast transient response DC-DC buck controller based on fixed frequency hysteresis control is presented. A carefully designed output voltage filter detects the output capacitor current change which helps the controller to respond immediately after load changes. Adaptive hysteresis control gu...

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Bibliographic Details
Published inJournal of semiconductors Vol. 34; no. 12; pp. 66 - 71
Main Author 陈明阳 赵梦恋 吴晓波
Format Journal Article
LanguageEnglish
Published 01.12.2013
Subjects
Adaptive control systems
Current mirrors
DC-DC控制器
Full load
Hysteresis
Semiconductors
Switching
Transient responses
Voltage
VRM
固定频率
滞环控制
电容电流
瞬态响应
输出电压
降压控制器
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Summary:A 2V-10A fast transient response DC-DC buck controller based on fixed frequency hysteresis control is presented. A carefully designed output voltage filter detects the output capacitor current change which helps the controller to respond immediately after load changes. Adaptive hysteresis control guarantees the switching frequency to be the same as the reference frequency by using a CCII-composed circuit and current mirrors. The controller is designed and fabricated in a TSMC 0.35 μm process. Simulation and test results show that this con- troller achieves a 20 μs settling time in one single switching cycle when load current changes from 1 A to the full load condition at 10 A.
Bibliography:fast response; hysteretic control; buck
11-5781/TN
Chen Mingyang, Zhao Menglian, Wu Xiaobo（Instimte of VLSI Design, Zhejiang University, Hangzhou 310027, China）
A 2V-10A fast transient response DC-DC buck controller based on fixed frequency hysteresis control is presented. A carefully designed output voltage filter detects the output capacitor current change which helps the controller to respond immediately after load changes. Adaptive hysteresis control guarantees the switching frequency to be the same as the reference frequency by using a CCII-composed circuit and current mirrors. The controller is designed and fabricated in a TSMC 0.35 μm process. Simulation and test results show that this con- troller achieves a 20 μs settling time in one single switching cycle when load current changes from 1 A to the full load condition at 10 A.
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ISSN:1674-4926
DOI:10.1088/1674-4926/34/12/125002