高速MOSFET栅极驱动电路的设计与应用指南.pdf

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1、DesignAndApplicationGuideForHighSpeedMOSFETGateDriveCircuitsByLaszloBaloghABSTRACTThemainpurposeofthispaperistodemonstrateasystematicapproachtodesignhighperformancegatedrivecircuitsforhighspeedswitchingapplications.Itisaninformativecollectionoftopicsofferi

2、nga“one-stop-shopping”tosolvethemostcommondesignchallenges.Thusitshouldbeofinteresttopowerelectronicsengineersatalllevelsofexperience.Themostpopularcircuitsolutionsandtheirperformanceareanalyzed,includingtheeffectofparasiticcomponents,transientandextremeop

3、eratingconditions.ThediscussionbuildsfromsimpletomorecomplexproblemsstartingwithanoverviewofMOSFETtechnologyandswitchingoperation.Designprocedureforgroundreferencedandhighsidegatedrivecircuits,ACcoupledandtransformerisolatedsolutionsaredescribedingreatdeta

4、ils.AspecialchapterdealswiththegatedriverequirementsoftheMOSFETsinsynchronousrectifierapplications.Several,step-by-stepnumericaldesignexamplescomplementthepaper.INTRODUCTIONMOSFET–isanacronymforMetalOxidesourcingandsinkingsufficientcurrenttoprovideSemicond

5、uctorFieldEffectTransistoranditisforfastinsertionandextractionofthecontrollingthekeycomponentinhighfrequency,highcharge.Fromthispointofview,theMOSFETsefficiencyswitchingapplicationsacrossthehavetobedrivenjustas“hard”duringturn-onelectronicsindustry.Itmight

6、besurprising,butandturn-offasabipolartransistortoachieveFETtechnologywasinventedin1930,some20comparableswitchingspeeds.Theoretically,theyearsbeforethebipolartransistor.ThefirstswitchingspeedsofthebipolarandMOSFETsignallevelFETtransistorswerebuiltinthelated

7、evicesareclosetoidentical,determinedbythe1950’swhilepowerMOSFETshavebeentimerequiredforthechargecarrierstotravelavailablefromthemid70’s.Today,millionsofacrossthesemiconductorregion.TypicalvaluesMOSFETtransistorsareintegratedinmoderninpowerdevicesareapproxi

8、mately20to200electroniccomponents,frommicroprocessors,picosecondsdependingonthesizeofthedevice.through“discrete”powertransistors.ThepopularityandproliferationofMOSFETThefocusofthistopicisthegatedrivetechnolog