STA4470
Ver 1.0
V
DD
t
on
V
IN
D
V
G S
R
GE N
G
90%
t
off
t
r
90%
R
L
V
OUT
t
d(on)
V
OUT
t
d(off)
90%
10%
t
f
10%
INVE R TE D
S
V
IN
50%
10%
50%
P ULS E WIDTH
Figure 13. Switching Test Circuit
Figure 14. Switching Waveforms
1
0.5
Normalized Transient
Thermal Resistance
0.2
0.1
0.1
0.05
0.02
0.01
P
DM
0.01
Single Pulse
1.
2.
3.
4.
t
1
t
2
R
thJ A
(t)=r (t) * R
thJ A
R
thJ A
=S ee Datas heet
T
J M-
T
A
= P
DM
* R
thJ A
(t)
Duty C ycle, D=t
1
/t
2
0.001
0.0000 1
0.000 1
0.001
0.01
0. 1
1
10
100
1000
Square Wave Pulse Duration(sec)
Figure 15. Normalized Thermal Transient Impedance Curve
Aug,18,2008
5
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