L4971D(2000) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
L4971D Datasheet PDF : 12 Pages
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Figure 9. Switching Frequency vs. input
voltage.
fsw
(KHz)
D97IN735
107.5
105.0
102.5
Tj=25°C
100.0
97.5
95.0
92.5
90.0
0 5 10 15 20 25 30 35 40 45 50 VCC(V)
Figure 11. Dropout voltage between pin 5
and 4.
∆V
D97IN736
(V)
0.5
Tj=125°C
0.4
Tj=25°C
0.3
0.2
Tj=-25°C
0.1
0.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
Figure 13. Efficiencyvs. output current.
η
(%)
D97IN738
VCC=8V
90
VCC=12V
85
VCC=24V
80
75
VCC=48V
70
65
fsw=100KHz
VO=5.1V
60
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
L4971
Figure 10. Switching frequency vs. junction
temperature.
fsw
(KHz)
D97IN785
105
100
95
90
-50
0
50
100
Tj(°C)
Figure 12. Efficiency vs output voltage.
η
(%)
D97IN737
96
100KHz
94
200KHz
92
90
88
VCC=35V
IO=1.5A
86
84
82
0
5 10 15 20 25 VO(V)
Figure 14. Efficiencyvs. output current.
η
D97IN739
(%)
90
VCC=8V
85 VCC=12V
VCC=24V
80
75
VCC=48V
70
fsw=100KHz
VO=3.36V
65
60
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
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