IRF640, RF1S640, RF1S640SM
Test Circuits and Waveforms
V
DS
BV
DSS
L
VARY t
P
TO OBTAIN
REQUIRED PEAK I
AS
V
GS
DUT
t
P
R
G
-
I
AS
V
DD
t
P
V
DS
V
DD
+
0V
I
AS
0.01Ω
0
t
AV
FIGURE 15. UNCLAMPED ENERGY TEST CIRCUIT
FIGURE 16. UNCLAMPED ENERGY WAVEFORMS
t
ON
t
d(ON)
t
r
R
L
V
DS
+
t
OFF
t
d(OFF)
t
f
90%
90%
R
G
DUT
-
V
DD
0
10%
90%
10%
V
GS
V
GS
0
10%
50%
PULSE WIDTH
50%
FIGURE 17. SWITCHING TIME TEST CIRCUIT
V
DS
(ISOLATED
SUPPLY)
FIGURE 18. RESISTIVE SWITCHING WAVEFORMS
CURRENT
REGULATOR
V
DD
SAME TYPE
AS DUT
0.3µF
Q
gs
D
V
DS
G
DUT
0
I
G(REF)
0
I
G
CURRENT
SAMPLING
RESISTOR
S
V
DS
I
D
CURRENT
SAMPLING
RESISTOR
I
G(REF)
0
Q
g(TOT)
Q
gd
V
GS
12V
BATTERY
0.2µF
50kΩ
FIGURE 19. GATE CHARGE TEST CIRCUIT
FIGURE 20. GATE CHARGE WAVEFORMS
©2001 Fairchild Semiconductor Corporation
IRF640, RF1S640, RF1S640SM Rev. B
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
