E-L4973D3.3 データシートの表示（PDF） - STMicroelectronics
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E-L4973D3.3 Datasheet PDF : 27 Pages
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L4973
Typical characteristics
Figure 31. Efficiency vs. output current Figure 32. Power dissipation vs. input
(see Figure 8)
voltage (device only)
(see Figure 7)
η
(%)
90
85
80
75
D97IN662
Vcc=12V
VO = 3.3V
fsw = 200KHz
Vcc=24V
Vcc=48V
Pdiss
(W)
1.5
1.0
0.5
D97IN647A
VO = 5.1V
fsw = 100KHz
IO=3.5A
IO=3A
IO=2.5A
IO=2A
70
0 0.5 1 1.5 2 2.5 3 3.5 IO(A)
0
0 10 20 30 40 50 Vcc(V)
Figure 33. Power dissipation vs. output Figure 34. Pulse by pulse limiting
voltage (device only)
current vs.
junction temperature
Pdiss
(W)
3.0
2.5
2.0
1.5
1.0
0.5
VCC = 35V
fsw = 100KHz
D97IN648
IO=3.5A
IO=3A
IO=2.5A
IO=2A
IO=1A
0
0 5 10 15 20 25 30 VO(V)
Ilim
D97IN652
(A)
5.2
5
4.8
Vcc=35
4.6
4.4
4.2
-40 -20 0 20 40 60 80 100 120 Tj(˚C)
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