简单的电源FET驱动器是孤立的和直流耦合

摘要：一个隔离变压器驱动IC（MAX845）和小的外部变压器产生的功率FET的隔离门极控制信号。

Maxim>AppNotes>COMMUNICATIONSCIRCUITSKeywords:galvanicisolation,transformer-driver,powerFET,powerelectronicsMar14,2005APPLICATIONNOTE3465SimplePower-FETDriverisIsolatedandDC-CoupledAbstract:Anisolatedtransformer-driverIC(MAX845)andsmallexternaltransformerproduceanisolatedgate-controlsignalforapowerFET.DesignersofpowerelectroniccircuitsmustoftendrivepowerswitchesthatfeedDC,AC,orpowersignalstoavarietyofloads.Logic-levelelectroniccircuitsalwaysprovidethedrivingsignals.Ingeneral,however,thepowersourcesandtheirloadshavereferencelevelsdifferentfromthatofthecontrolcircuitry(ground).Anisolatedtransformer-driverIC(MAX845)servesasacontrol-signalgenerator.Thesignal