L4973
Figure 31. Efficiency vs. output current
(see
Typical characteristics
Figure 32. Power dissipation vs. input
voltage (device only)
(see
Pdiss
(W)
D97IN647A
η
(%)
90
Vcc=12V
D97IN662
V
O
= 3.3V
f
sw
= 200KHz
V
O
= 5.1V
f
sw
= 100KHz
1.5
I
O
=3.5A
85
Vcc=24V
1.0
I
O
=3A
80
Vcc=48V
I
O
=2.5A
75
0.5
I
O
=2A
70
0
0.5
1
1.5
2
2.5
3
3.5 I
O
(A)
0
0
10
20
30
40
50
Vcc(V)
Figure 33. Power dissipation vs. output
voltage (device only)
Figure 34. Pulse by pulse limiting
current vs.
junction temperature
Ilim
(A)
5.2
5
D97IN652
Pdiss
(W)
3.0
V
CC
= 35V
f
sw
= 100KHz
D97IN648
I
O
=3.5A
2.5
2.0
1.5
1.0
0.5
0
0
5
10
15
20
25
30
V
O
(V)
I
O
=3A
4.8
I
O
=2.5A
Vcc=35
4.6
I
O
=2A
I
O
=1A
4.4
4.2
-40 -20 0
20 40 60 80 100 120
Tj(˚C)
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