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AN4354 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN4354 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 14 page DocID025239 Rev 2 7/14 AN4354 Gate driving circuitry 14 1.3 Turn-off sequence When one of the external MOSFET must be turned-off the gate driving circuitry starts sinking the programmed current from the gate. At the beginning of the controlled current time the gate current is set to the maximum for tboost time. After the controlled current time expires, the Miller clamp switch is turned on (see Figure 6). Figure 6. Turn-off sequence During the turn-off the gate-source voltage (Vgs) of the MOSFET decreases down to the Miller plateau region. During the plateau the gate-source voltage remains constant while the drain-source voltage (Vds) reaches the motor supply value. Meanwhile the MOSFET still conducts the current. After the plateau region, the drain current decreases down to zero as the gate-source voltage. |
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