
IRFBC40, IRFBC42
Test Circuits and Waveforms (Continued)
CURRENT
REGULATOR
12V
BATTERY
0.2µF 50kΩ
0.3µF
VDS
(ISOLATED
SUPPLY)
SAME TYPE
AS DUT
D
G
DUT
IG(REF)
0
S
VDS
IG CURRENT
ID CURRENT
SAMPLING
SAMPLING
RESISTOR
RESISTOR
FIGURE 19. GATE CHARGE TEST CIRCUIT
VDD
Qgs
Qg(TOT)
Qgd
VGS
VDS
0
IG(REF)
0
FIGURE 20. GATE CHARGE WAVEFORMS
5-7