Avago Technologies ACNT-H313-000E - Manual (Page 8)

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AV02-4222EN - August 20, 2013
Figure 8 shows the turn-on gate signal of Q1a and the turn-off gate signal of Q1b.
Figure 8. Turn-on and turn-off gate waveforms of Q1a and Q1b
Figure 7 and Figure 8 show that the turn-off speed of the switchers is about 200 ns, due largely to the capacitive effects
of D2 and the gate capacitance of Q1. To improve the turn-off speed, the board is provided with a diode resistor pair
footprints at D1 and R5 (not mounted) to increase the gate current during turn-off. Another way to further improve the
turn-on and turn-off speed is by reducing the gate resistance of R4, but make sure that the gate drive current is not more
than 2.5 A.