IR3103
75.0
70.0
65.0
60.0
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
Zth(J-A) self
Zth(J-A) mutual
0.0
1E-4
1E-3
0.01
0.1
1
10
100
1000
10000
Time - s
Figure 9. Thermal Impedance vs. Time
12.0
11.0
10.0
10μF
D BS
C BS
V DD
9.0
+15V
V CC
v B
H O
8.0
H IN
H IN
V S
Vo
7.0
6.8μF
L IN
L IN
V SS
COM
L O
6.0
V SS
COM
5.0
4.0
3.0
2.0
4.7μF
3.3μF
2.2μF
1.0μF
1.0
0
5
10
15
20
PWM Frequency - kHz
Figure 10. Recommended Bootstrap Capacitor Value vs. Switching Frequency
10
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