IRF4905
2500
2000
1500
1000
500
L
V
I
D S
D
TOP
-16A
-27A
BOTTOM -38A
D .U .T
AS
R
G
V
D D
A
I
D R IVER
-20V
0 .0 1
Ω
t
p
15V
Fig 12a. Unclamped Inductive Test Circuit
0
A
175
25
50
75
100
125
150
I
AS
Starting TJ , Junction Temperature (°C)
Fig 12c. Maximum Avalanche Energy
Vs. Drain Current
t
p
V
(BR)DSS
Fig 12b. Unclamped Inductive Waveforms
Current Regulator
Same Type as D.U.T.
50KΩ
Q
G
.2µF
12V
.3µF
-10V
-
V
+
DS
Q
Q
GD
D.U.T.
GS
V
GS
V
G
-3mA
I
I
D
G
Charge
Current Sampling Resistors
Fig 13a. Basic Gate Charge Waveform
Fig 13b. Gate Charge Test Circuit