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Selecting Gate Drive Resistors
Optimal Gate Resistor Value
As described above, increasing the gate resistor value reduces the ringing but
also reduces switching speed and therefore increases switching loss. This is
because the gate resistor value and gate voltage restrict the gate charge current.
Reducing the gate resistor value increases switching speed at the expense of
increased ringing.
Figure 31 and Figure 32 illustrate how di/dt and dv/dt change with different
values of Gate resistors.
V
= 0 to 18 V
GS
V
= 400 V
DS
I
= 10 A
DS
Figure 31 Gate Resistor vs. Switching Speed at Turn-On
Keysight Double-Pulse Test Fixture Installation and Use Guide
R
(in
di/dt
td (ns)
G
Ohms)
(A/µs)
100
108.8
262
86
118.2
234.7
54
171
156
10
437
61.4
0
778
15
Custom Gate Drive Resistors
tf (ns)
toff (ns)
dv/dt
(V/µs)
156.6
418.6
2632.7
141.2
375.9
2870
103.6
259.6
3779
43.5
104.9
8524
31
46
19112
E
E
(µJ)
ON
OFF
(µJ)
737
325
674
287
503
174
253
52
20
20
69
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