A digital soft-start circuit for buck DC-DC converter

被引：5
|
作者：
Wang X.H. [1 ,2 ]
Tian L. [3 ]
机构：
[1] College of Tourism and Environment Science, Shaanxi Normal University, Xi’an
[2] Leisure Management College, Xi’an Eurasia University, Xi’an
[3] School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an
来源：
Russian Electrical Engineering | 2017年 / 88卷 / 2期
关键词：
DC-DC converter; overshoot voltage; rush current; soft-start;
D O I：
10.3103/S1068371217020109
中图分类号：
学科分类号：
摘要：
In this paper, a soft-start circuit is present to prevent the large surge current and overshoot voltage to improve the reliability of the DC-DC converter. The proposed structure generates the step-shaped soft-start voltage through 7 bits DAC. Combining with the PWM comparator, the soft-start circuit controls the system duty cycle directly. The mechanism of the soft-start acts as the high clamp function, which eliminates the need of the clamp circuit. A DC-DC buck converter with the proposed soft-start circuit is based on a 0.4 μm BCD process for verification Hspice simulation shows that under the condition with 3.6 V input voltage, 1.8 V output voltage and 600 mA load current, the soft-start is achieved. After 1.2 ms of the soft-start time, the operation turns to stable. © 2017, Allerton Press, Inc.
引用
收藏
页码：91 / 97
页数：6
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