一种用于升压式DC-DC开关电源的新型软启动电路

设计了一种用于升压式DC-DC开关电源的新型软启动电路。该电路结构简单、稳定性强、易于集成、功耗较低,不仅能有效地抑制DC-DC开关电源在启动时产生的浪涌电流,而且能避免电压过冲现象,保证输出电流上升的稳定性和可靠性。该电路采用0.5μm CMOS工艺进行设计,已成功集成到一款升压式DC-DC开关电源芯片内。测试结果表明,在输入电压为3.6 V,输出电流为100 mA的工作状态下,输出电流分四段台阶平稳上升、无电压过冲现象,启动时间控制在140μs以内。

A novel soft-start circuit for boost DC-DC switching regulator

A novel soft-start circuit for boost DC-DC regulator was presented with the characteristics of simple structure,strong stability,and ease of integration and low power consumption.The proposed circuit could not only effectively eliminate the inrush current during start-up,but also avoid the overshoot of the output voltage,ensuring the rising stability and reliability of output current.The soft-start circuit was designed on the basis of 0.5μm CMOS devices and was successfully integrated into a boost DC-DC chip.The experimental results show that with an input voltage of 3.6 V,the output current is 100 mA,rising smoothly in four steps within 140 μs without overshoot voltage.