Figure 12. Gate Charge Test Circuit & Waveform
VGS
Same Type
50KΩ
as DUT
Qg
12V
200nF
10V
300nF
VDS
VGS
Qgs
Qgd
DUT
I
= const.
3mA
G
Charge
Figure 13. Resistive Switching Test Circuit & Waveforms
RL
VDS
90%
VDS
VDD
VGS
RG
10%
VGS
DUT
V
10V
GS
td(on)
tr
td(off)
tf
t on
t off
Figure 14. Unclamped Inductive Switching Test Circuit & Waveforms
BVDSS
--------------------
BVDSS - VDD
L
1
2
2
----
EAS
=
L IAS
VDS
I D
BVDSS
IAS
RG
VDD
ID (t)
V
VDS (t)
VDD
V
DUT
1G0VS
GS
t p
t p
Time
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©2004 Fairchild Semiconductor Corporation
FQP19N20C / FQPF19N20C Rev. C1
6
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