Transcription of Bootstrap Circuitry Selection for Half Bridge Configurations
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Bootstrap Circuitry Selection for Half Bridge Configurations
1 SLUA887 August2018 SubmitDocumentationFeedbackCopyright 2018,TexasInstrumentsIncorporatedBootstr apCircuitrySelectionfor half -BridgeConfigurationsApplicationRepo rtSLUA887 August2018 BootstrapCircuitrySelectionfor half -BridgeConfigurationsMamadouDiallo,H ighPowerDriversABSTRACTD rivingMOSFETsin half -bridgeconfigurationspresentmanychal lengesfor thosechallengesis generatingbiasfor the bootstrapcircuittakescareof this ,TI's 620 Vhalf-bridgegatedriverwith interlockto presentthe differentcomponentsin a bootstrapcircuitand how to properlyselectthemin orderto ensurepredictableswitchingof the of to to BootstrapDiodeReverseRecoveryTime(Zoomed Out).
When the low-side FET is turned off and the high-side is on, the HS pin of the gate driver and the switch node are pulled to the high voltage bus HV; the bootstrap capacitor discharges some of the stored voltage (accumulated during the charging sequence) to the high-side FET through the HO and HS pins of the gate driver as shown in Figure 2 ...
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