L4971D(2000) データシートの表示（PDF） - STMicroelectronics
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L4971D Datasheet PDF : 12 Pages
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L4971
Figure 15. Efficiencyvs. output current.
η
(%)
D97IN740
VCC=8V
90
VCC=12V
85
VCC=24V
80
VCC=48V
75
70
fsw=200KHz
VO=5.1V
65
60
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
Figure 17. Efficiencyvs. Vcc.
η
D97IN742
(%)
V0=5.1V-fSW=100KHz
85
V0 =5.1V-fSW =200KHz
80
75
IO=1.5A
V
0
=3V.03=63V.-3fS6WV=-1fS2W00=K1H0z0KHz
70
0
10 20 30 40 50 VCC(V)
Figure 19. Efficiencyvs. Vo.
Pdiss
(mW)
800
600
VCC=35V
fsw=100KHz
D97IN744
IO=1.5A
IO=1A
400
IO=0.5A
200
0
0
5 10 15 20 25 30 V0(V)
8/12
Figure 16. Efficiencyvs. output current.
η
D97IN741
(%)
90
VCC=8V
85
VCC=12V
80
VCC=24V
75
70
VCC=48V
65
fsw=200KHz
VO=3.36V
60
55
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
Figure 18. Power dissipation vs. Vcc.
Pdiss
(mW)
800
D97IN743
VO=5.1V
fsw=100KHz
600
IO=1.5A
IO=1A
400
IO=0.5A
200
0
0
10 20 30 40 50 VCC(V)
Figure 20. Pulse by pulse limiting current vs.
junction temperature.
Ilim
D97IN747
(A)
fsw=100KHz
2.9
VCC=35V
2.8
2.7
2.6
2.5
2.4
2.3
-50 -25 0 25 50 75 100 125 Tj(°C)
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