标签: turn-on

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>AppNotes>BATTERYMANAGEMENTPOWER-SUPPLYCIRCUITSKeywords:Turn-OnSwitchingLossofAnAsynchronousBuckConverterDec27,2001APPLICATIONNOTE912Turn-OnSwitchingLossofAnAsynchronousBuckConverterFigure1showsasimplifiedbuckconverterwithasynchronousrectificationbasedontheMAX1744/5controllerIC.Duetotheturn-offnatureofthediode,turn-onswitchinglossofthemainswitch(Q1)dependsontheswitchingfrequency,thetraceinductanceoftheinputloop(consistingofC1,Q1andD1),thegatecharge(Millercapacitance)ofthemainswitchingMOSFET,andthedrivecapabilityofthecontrolIC.Thisapplicationnotewillprovidedetailedanalysisofturn-onswitchinglossandthecriteriaforselectingtheswitchin……