Design and implementation of adaptive slope compensation in current mode DC-DC converter

To improve the compensation for the inherent instability in a current mode converter, the adaptive slope compensation, giving attention to the problems of the traditional compensation on compensation accuracy, loading capability and turning jitter, is presented. Based on the analysis of current loop...

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Bibliographic Details
Published in:Journal of semiconductors 2010-12, Vol.31 (12), p.109-115
Main Authors: Guo, Zhongjie (仲杰 郭), Wu, Longsheng (龙胜 吴), Liu, Youbao (佑宝 刘)
Format: Article
Language:English
Subjects:
CMOS工艺
DC
斜坡补偿
模式转换器
电流模式
自适应
补偿精度
设计
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Summary:To improve the compensation for the inherent instability in a current mode converter, the adaptive slope compensation, giving attention to the problems of the traditional compensation on compensation accuracy, loading capability and turning jitter, is presented. Based on the analysis of current loop, by detecting the input and output voltage, converting the adaptive slope compensation current, the compensation of the current loop is optimized successfully. It can not only improve the compensation accuracy but also eliminate the over compensation, the turning jitter and the poor loading capability in the reported slope compensation. A power supply chip with adaptive slope compensation has been fabricated in a 0.35 μm CMOS process. The measurement results show that the chip starts up and operates steadily with the constant current limit under conditions of 5 V input voltage, from 10% to 100% duty cycle.
ISSN:1674-4926
DOI:10.1088/1674-4926/31/12/125004