2SH14
Normalized Transient Thermal Impedance vs. Pulse Width
3
1 D=1
0.5
0.3
0.2
0.1
0.1
0.05
0.02
0.03
1
0.01
shot
Pulse
0.01
10 µ
100 µ
θch – c(t) = γ s (t) • θ ch – c
θch – c = 1.25 °C/W, Tc = 25 °C
PCM
PW
T
D=
PW
T
1m
10 m
100 m
1
10
Pulse Width PW (S)
Switching Time Test Circuit
Ic Monitor
Vin Monitor
Rg
Vin ± 15 V
VCE
Monitor
D.U.T.
RL
VCC
0
Vin
Waveforms
10%
90%
VCE
90%
90%
Ic
td(on)
10%
tr td(off)
ton
10%
tf
toff
6