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引用次数: 7
摘要
本文提出了一种适用于移动设备的升压式dc-dc变换器。转换器工作在1mhz的高开关频率下。变换器的功率级包括电感、输出电容、MOS晶体管和用于控制回路的反馈电阻。控制级由误差放大器、比较器、用于PWM模块的斜坡发生器、带带隙基准和带功率晶体管的软启动模块组成。此外，该电路还包括过压保护(OVP)，欠压锁定(UVLO)和热关闭(TSD)块等保护块。所提出的升压变换器采用0.18 um CMOS工艺技术设计。仿真结果表明，当输入电压为3.3 V，输出电流为100 mA时，输出电压为5 V，纹波为40 mV。
Design of a 5V-output boost DC-DC converter with improved protection functions for battery-operated devices
In this paper, a step-up dc-dc converter for mobile device applications is proposed. The converter is operated with 1 MHz high switching frequency. The power stage of converter includes an inductor, an output capacitor, MOS transistors and feedback resistors for control loop. The control stage consists of an error amplifier, comparator, a ramp generator for PWM block, bandgap reference and soft start block with power transistor. Also, the circuit includes protection block such as over voltage protection (OVP), under voltage lock out (UVLO) and thermal shutdown (TSD) block. The proposed step-up converter has been designed with a 0.18 um CMOS process technology. Simulation results show an output voltage of 5 V with a ripple of 40 mV at the output current of 100 mA for an input voltage of 3.3 V.
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