开启开关损耗的异步 Buck 变换器

图1显示了一个简化的降压转换器与基于MAX1744 / 5的控制器IC的异步整改。由于二极管的关断性质，打开开关（Q1）的主开关损失取决于开关频率，输入回路的C1 ， Q1和D1组成的引线电感，栅极电荷（米勒电容）主开关MOSFET和控制IC的驱动能力。本应用笔记将提供上依次选择开关P-通道MOSFET开关损耗和标准的详细分析。

Maxim > App Notes > BATTERY MANAGEMENT POWER-SUPPLY CIRCUITS

Keywords: Turn-On Switching Loss of An Asynchronous Buck Converter Dec 27, 2001

APPLICATION NOTE 912
Turn-On Switching Loss of An Asynchronous Buck Converter
Figure 1 shows a simplified buck converter with asynchronous rectification based on the MAX1744/5 controller
IC. Due to the turn-off nature of the diode, turn-on switching loss of the main switch (Q1) depends on the
switching frequency, the trace inductance of the input loop (consisting of C1, Q1 and D1), the gate charge (Miller
capacitance) of the main switching MOSFET, and the drive capability of the control IC. This application note will
provide detailed analysis of turn-on switching loss and the criteria for selecting the switchin