Implementation and Design of Current-mode PWM Control CMOS Buck Power Converter with Protection Circuits
Abstract
A lower power consumption, smaller output ripple and better regulation current-mode CMOS buck power converter with a novel on-chip soft-start circuit for feedback control is implemented in this paper. The over-current protection and soft-start circuit can produce a slowly rising output voltage without extra clock or any external component to prevent inrush current and output voltage overshoot during the start-up period of the converter. The converter is designed and simulated using the TSMC 0.18μm MM/RF 1P6M SALICIDE 1.8V/3.3V CMOS process. Hspice simulation results show that, the buck converter having 1.129 1.200mm2 chip size with power efficiency about 90%. This chip can operate with input supply voltage from 2.8V to 3.3V , and its output voltage can stable at 1.2V and less than 22mV ripple voltage at maximum loading current 500mA. The simulation shows the circuit has about 1.0ms of soft-start time and can inhibit the inrush current when the power on.
Keywords
Buck power converter, Soft-start circuit, Current sensing circuit, Slope compensation ramp circuit, Zero-current detection and anti-ringing circuitr
DOI
10.12783/dteees/peem2016/5013
10.12783/dteees/peem2016/5013
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