2SJ291
Normalized Transient Thermal Impedance vs. Pulse Width
3
Normalized Transient Thermal Impedance
γ
s (t)
1
D=1
0.5
0.2
Ta = 25 °C
0.3
0.1
0.1
0.05
0.03
θ
ch – c(t) =
γ
s (t) •
θ
ch – c
θ
ch – c = 2.08 °C/W
PCM
PW
T
0.02
0.01
0.01
D=
PW
T
0.003
10 µ
se
pul
ot
1sh
100 µ
1m
10 m
100 m
1
PW (S)
10
100
1000
Pulse Width
Switching Time Test Circuit
Vin Monitor
D.U.T.
R
L
Vout
Monitor
Vin
10%
Waveforms
90%
Vin
10 V
50Ω
V
DD
= 30 V
Vout
td(on)
90%
10%
tr
td(off)
90%
10%
t
f
7
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