L4973 STMicroelectronics, L4973 Datasheet - Page 17

• Manufacturer Part Number: L4973
• Description: 3.5A STEP DOWN SWITCHING REGULATOR
• Manufacturer: STMicroelectronics

L4973
Figure 31. Efficiency vs. output current
Figure 33. Power dissipation vs. output
Pdiss
(%)
(W)
3.0
2.5
2.0
1.5
1.0
0.5
90
85
80
75
70
η
0
0
0
0.5
5
Vcc=12V
(see
voltage (device only)
V
f
sw
CC
= 100KHz
1
= 35V
10
Figure
1.5
Vcc=24V
15
Vcc=48V
2
20
8)
2.5
V
f
sw
O
25
= 3.3V
= 200KHz
3
I
I
I
O
30
D97IN662
3.5
O
O
I
D97IN648
I
O
O
=3.5A
=2.5A
=2A
=1A
=3A
V
I
O
O
(A)
(V)
Figure 32. Power dissipation vs. input
Figure 34. Pulse by pulse limiting
Pdiss
(W)
1.5
1.0
0.5
Ilim
(A)
5.2
4.8
4.6
4.4
4.2
0
5
-40 -20
0
10
voltage (device only)
(see
current vs.
junction temperature
0
I
20 40
O
20
=2.5A
Figure
I
O
=3A
Typical characteristics
I
O
I
O
=3.5A
30
60 80
=2A
Vcc=35
7)
40
100
V
f
sw
O
= 5.1V
= 100KHz
120
50
D97IN647A
D97IN652
Tj(˚C)
Vcc(V)
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