Test Circuits and Waveforms (Continued)
VGS
Ig(REF)
VDS
L
DUT
+
VDD
-
Figure 16. Gate Charge Test Circuit
VDD
VGS
VDS
Qg(TOT)
Qg(4.5)
VGS = 4.5V
VGS = 10V
VGS = 1V
0
Qg(TH)
Qgs
Ig(REF)
0
Qgd
Figure 17. Gate Charge Waveforms
VDS
RL
VGS
RGS
DUT
+
VDD
-
VGS
Figure 18. Switching Time Test Circuit
VDS
tON
td(ON)
tr
90%
tOFF
td(OFF)
tf
90%
10%
0
10%
VGS
10%
0
50%
PULSE WIDTH
90%
50%
Figure 19. Switching Time Waveforms
©2004 Fairchild Semiconductor Corporation
FDT461N Rev. A1