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引用次数: 19
摘要
提出了一种新颖的拓扑简单的DC-DC降压变换器内部软启动电路。它是通过控制误差放大器的输出来实现的，使开关电流限制在不使用外部电容的情况下逐级增加，从而降低了元件成本，节省了电路板空间，有利于便携式应用。该电路基于Hynix 0.5 μ m CMOS工艺设计，并通过Hspice仿真和测量结果验证了其性能。为了避免浪涌电流和过调电压，IC在1.6 ms内分4步启动，输入电压3.6 V，输出电压1.8 V，输出电容22 muF，负载电流1.1 A。
A novel compact soft-start circuit with internal circuitry for DC-DC converters
A novel internal soft-start circuit with simple topology for DC-DC buck converters is presented. It is implemented by controlling the output of error amplifier to make switch current limit increases in steps without using external capacitor, which reduces the component cost, saves board space and benefits for portable applications. This circuit is designed on the basis of Hynix 0.5 mum CMOS process, and its performance has been verified by Hspice simulation and measurement results. Avoiding the inrush current and overshoot vloltage, the IC starts up in 4 steps in 1.6 ms with input voltage of 3.6 V, output voltage of 1.8 V, output capacitor of 22 muF and load current of 1.1 A.
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