13.25.3 Floating Gate Suppression

The gate drive pins may float when the supply voltage is lost or an overvoltage situation shuts down the driver. When an overvoltage condition exists, the driver high-side and low-side outputs are tri-state. Each external MOSFET that is connected to the gate driver should have a gate-to-source resistor to bleed off any charge that may accumulate due to the tri-state. This will help prevent inadvertent turn-on of the MOSFET.

Figure 13-9 shows the location of the overvoltage transzorbs (or equivalent circuits), gate resistors, bootstrap resistors and gate-to-source resistors.