Ch7 Protect High Side Drivers.ppt
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Ch7 Protect High Side Drivers.ppt

Ch7ProtectHighSideDrivers.ppt

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BridgingTheoryinPracticeProtectedHighSideDriversProtectedHighSideDriversIntendedAudience:ElectricalengineerswithaknowledgeofsimpleelectricalcircuitsAnunderstandingofMOSFETsandhighsidedriversisassumedTopicsCovered:WhatisaPROFET?WhattypeofprotectiondoesaPROFEThave?WhattypeofdiagnosticsdoesaPROFEThave?HowdoesaPROFETimpactsystemEMI?HowisaPROFETcircuitimplemented?PROFETSelectionQuestionsExpectedTime:Approximately90MinutesProtectedHighSideDriversDMOSFETRegionsofOperationHighSideDrive(HSD)ConfigurationHighSideDrive(HSD)ConfigurationPROFETs=PROtectedFETsVoltageControlledPROFETBlockDiagramCurrentControlledPROFETBlockDiagramIntroductiontoPROFETsRuggedvs.ProtectedPROtectedFET(PROFET)ProtectionFeaturesBlockDiagramIncludingProtectionFeaturesESDProtectionOvervoltageProtectionOvervoltageShutdownProtectionandRestartUndervoltageShutdownProtectionandRestartLoadDumpProtection4)Theovertemperatureprotectionisnotactiveduringreversecurrentoperation!4)Thetemperatureprotectionisnotactiveduringreversecurrentoperation!4)Thetemperatureprotectionisnotactiveduringreversecurrentoperation!RbbInductiveandOvervoltageOutputClampProtectionThermalShutdownProtectionCurrentLimitProtectionShortCircuitShutdownProtectionShortCircuitShutdownProtectionInversave™InverseCurrentProtectionLossofGroundProtectionLossofSupplyVoltageProtectionIntroductiontoPROFETsPROFETDiagnosticFeedbackDigitalvs.AnalogDigitalDiagnosticFeedbackAnalogDiagnosticFeedbackAnalogLoadCurrentFeedbackViaIISCurrentIISCurrentSenseRatioIISCurrentSenseRatioStatusSignalSettlingTimeOpenLoadDetectionOpenLoadDetection–ViaSensePinOpenLoadDetection–PROFETOnOpenLoadDetection-PROFETOffIntroductiontoPROFETsMOSFETHighSideDriveChargePumpGateVoltageChargePumpGateVoltageChargePumpGateVoltageChargePumpGateVoltageNow,theHighSideDriveMOSFETcanbeturnedonTheturningonandoffofSwitchAandSwitchB,however,leadstoanewproblem….ChargePumpElectromagneticInterference(EMI)Frequency(MHz)FiltersolutionsmayberequiredforthechargepumpEMI/EMCEmissionsduetoPWMOpera