L4976D(2000) 查看數據表（PDF） - STMicroelectronics
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L4976D Datasheet PDF : 11 Pages
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L4976
Figure 7. Switching frequency vs. junction
temperature.
fsw
(KHz)
D97IN785
105
100
95
90
-50
0
50
100
Tj(°C)
Figure 9. 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 11. 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)
6/11
Figure 8. 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 10. 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)
Figure 12. Efficiencyvs. output current.
D97IN740
η
(%)
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)
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