⚡ 本页包含 AI 生成的分析内容，仅供参考
本文提出了一种自动可选频率的脉宽调制器，用于降压转换器。通过根据负载电流自动调整开关频率，降低轻载时的开关损耗和栅驱动损耗，从而显著改善轻载效率。
In order to be useful for mobile systems, the switching frequencies of modern buck converters (BCs) are in the MHz- or even GHzrange to enable the use of compact off-chip inductors and capacitors [1], or even on-chip Ls and Cs [2]. However, such high switching frequencies increase both the switching loss and the gate-drive loss, and degrade BC light-load efficiency since these losses are independent of load current. Pulse-frequency modulation (PFM) is known to improve light-load efficiency by scaling the switching frequency with the load current so that the switching loss and the gate-drive loss are reduced with decreased load current. However, PFM makes the BC output spectrum change with the load current. This unpredictable spectrum causes supplyintegrity to be an issue in mobile systems where different spectrum-sensitive circuits, such as communication ICs, are often used. Recently, the light-load efficiency of BCs operating at a
Tsz Yin Man, Philip K. T. Mok, Mansun Chan
The Hong Kong University of Science and Technology, Kowloon, Hong Kong