Gate driving circuitry

AN4355

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DocID025240 Rev 2

4.1

Turn-on sequence

When one of the external MOSFET must be turned-on the gate driving circuitry disables the

respective Miller clamp switch and starts forcing the programmed current into the gate. After

the controlled current time expires, the high-side and the low-side drivers act differently: the

low-side drivers do not limit the gate current; the high-side ones instead limit the gate

current to about 1 mA.

Figure 12. Turn-on sequence

4.2

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

expires, the Miller clamp switch is turned on.