P-CHANNEL
POWER MOSFET
SFF9240
Fig 12. Gate Charge Test Circuit & Waveform
“ Current Regulator ”
VGS
Same Type
as DUT
50KΩ
Qg
12V
200nF
-10V
300nF
VDS
Qgs
Qgd
VGS
DUT
R2
-3mA
R1
Charge
Current Sampling (IG) Current Sampling (ID)
Resistor Resistor
Fig 13. Resistive Switching Test Circuit & Waveforms
RL
t on
t off
Vout
Vin
tf
td(on)
tr
td(off)
VDD
( 0.5 rated VDS
)
Vin
10%
RG
DUT
-10V
90%
Vout
Fig 14. Unclamped Inductive Switching Test Circuit & Waveforms
BVDSS
1
2
2
LL
ID
----
--------------------
BVDSS -- VDD
EAS
=
LL IAS
VDS
t p
Time
Vary tp to obtain
required peak ID
VDD
VDS (t)
RG
C
VDD
ID (t)
DUT
-10V
IAS
BVDSS
t p
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
