一种提高DC-DC瞬态响应的误差放大器设计  

Design of an Error Amplifier for Improving Transient Response of DC-DC Converter

作　　者：许崇为 杨令[1] 韩志超[1] 刘跃智 

机构地区：[1]西安电子科技大学电路CAD研究所,陕西西安710071

出　　处：《电子科技》2014年第9期109-111,114,共4页Electronic Science and Technology

摘　　要：设计了一种可提高DC-DC瞬态响应的误差放大器,其输出阻抗和补偿电阻随着负载电流的变化动态调整,使系统在不同的负载条件下能够获取足够的相位裕度。同时,设计了采样电路和逻辑选择电路,分别用于检测负载电流变化和选择开关导通。结果显示,采用文中所提出结构,DC-DC的过冲比原来减小了50%。A novel error amplifier is presented to improve the transient response of DC-DC converter. The output impedance and compensation resistors of the error amplifier are dynamically adjusted according to different load conditions for the system to achieve enough phase margins. A current sensing circuit and a logic choice circuit are designed to derive load change and choose the switch to turn on. The test results show that the DC-DC converter with the proposed structure reduces the overshoot by 50%.

关 键 词：误差放大器 瞬态响应 输出阻抗 动态调整 

分 类 号：TN722[电子电信—电路与系统]