S TM4437
-VDD
on
t
toff
d(off)
t
r
t
d(on)
t
R L
f
t
V IN
90%
10%
90%
D
OUT
V
OUT
V
V
10%
VG S
R G E N
G
90%
50%
50%
S
IN
10%
INVE R TE D
P ULS E WIDTH
Figure 12. S witching Waveforms
Figure 11. S witching Test C ircuit
2
1
Duty C ycle=0.5
0.2
DM
P
0.1
0.1
1
t
0.05
2
t
1. R thJ A (t)=r (t) * R thJ A
2. R thJ A=S ee Datasheet
3. TJ M-TA = P DM* R thJ A (t)
4. Duty C ycle, D=t1/t2
0.02
S ingle P ulse
10-3
0.01
10-4
10-2
10-1
1
10
100
S quare Wave P ulse Duration (sec)
Figure 13. Normalized Thermal Transient Impedance C urve
5