2SJ279 L , 2SJ279 S
Normalized Transient Thermal Impendance vs. Pulse Width
3
Normalized Transient Thermal Impedance
γ
s (t)
Tc = 25°C
1
D=1
0.5
0.2
0.1
0.05
0.02
1
0.0
0.3
0.1
θ
ch – c(t) =
γ
s (t) •
θ
ch – c
θ
ch – c = 6.25 °C/W, Tc = 25 °C
lse
Pu
t
PDM
PW
T
D=
0.03
ho
1s
PW
T
0.01
10 µ
100 µ
1m
10 m
Pulse Width
100 m
PW (S)
1
10
Switching Time Test Circuit and Waveform
Vin
10%
Vin Monitor
D.U.T.
R
L
90%
Vin
–10 V 50Ω
V
DD
= –30 V
90%
Vout
Monitor
90%
Vout
t d (on)
10%
tr
t d (off)
10%
t
f
7
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