A new fast-response buck converter using accelerated pulse-width-modulation techniques

摘要

A new fast-response buck converter using accelerated pulse-width-modulation techniques is proposed in this article. The benefits of the accelerated pulse-width-modulation technique is fast-transient response, simple-compensation design, and no requirement for slope compensation; furthermore, some power management problems are minimized, such as EMI (Electro Magnetic Interference), size, design complexity, and cost. The traditional voltage-mode speed is slower with the transient response, so an accelerated pulse-width-modulation technique is used to solve the problem of slowed transient response in this article. The proposed buck converter has excellent conversion efficiency with a wide load conditions. The proposed buck converter has been fabricated with TSMC 0.35 μm CMOS 2P4M processes, and the total chip area is 1.32 × 1.22 mm~2. Maximum output current is 300 mA when the output voltage equals 1.8 V. When the supply voltage is 3.6 V, the output voltage can be 1-2.6 V. Maximum transient response is less than 5 μs. The simulation and experimental results are presented in this article.