An Adaptive On-Time-Controlled Buck Converter Using Frequency-Locked Techniques

• Main Authors: Chia-Hao Chang, 張家豪
• Other Authors: Yuh-Shyan Hwang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/u3y5ze

碩士 === 國立臺北科技大學 === 電子工程系研究所 === 104 === Conservative ripple-based regulator possesses the advantage of fast transient response. Nevertheless, when input and output voltage are changed, it suffers the variation of switching frequency. The thesis presents an adaptive on-time (AOT) switching converter using frequency-locked techniques. To achieve fixed frequency, phase-locked loop (PLL) is employed to keep the switching frequency (Fsw) constant at 1MHz. The chip is fabricated in TSMC 0.35um 2P4M process. The input voltage is 3.0V, and the output voltage range is 1.2~1.8V. The simulation results show that the maximum efficiency is 94.77% when the load current is 200mA and output voltage is 1.8V. The load transient response time is about 4.914 µs and 2.826 µs when the load current changes from 120 mA to 580 mA and from 580 mA to 120 mA, respectively.