
4-400
Test Circuits and Waveforms
FIGURE 15. UNCLAMPED ENERGY TEST CIRCUIT
FIGURE 16. UNCLAMPED ENERGY WAVEFORMS
FIGURE 17. SWITCHING TIME TEST CIRCUIT
FIGURE 18. RESISTIVE SWITCHING WAVEFORMS
FIGURE 19. GATE CHARGE TEST CIRCUIT
FIGURE 20. GATE CHARGE WAVEFORMS
t
P
V
GS
0.01
L
I
AS
+
-
V
DS
V
DD
R
G
DUT
VARY t
P
TO OBTAIN
REQUIRED PEAK I
AS
0V
V
DD
V
DS
BV
DSS
t
P
I
AS
t
AV
0
V
GS
R
L
R
G
DUT
+
-
V
DD
t
ON
t
d(ON)
t
r
90%
10%
V
DS
90%
10%
t
f
t
d(OFF)
t
OFF
90%
50%
50%
10%
PULSE WIDTH
V
GS
0
0
0.3
μ
F
12V
BATTERY
50k
V
DS
S
DUT
D
G
I
G(REF)
0
(ISOLATED
SUPPLY)
V
DS
0.2
μ
F
CURRENT
REGULATOR
I
D
CURRENT
SAMPLING
RESISTOR
I
G
CURRENT
SAMPLING
RESISTOR
SAME TYPE
AS DUT
Q
g(TOT)
Q
gd
Q
gs
V
DS
0
V
GS
V
DD
I
G(REF)
0
IRFR320, IRFU320