L5971 데이터 시트보기 (PDF) - STMicroelectronics
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L5971 Datasheet PDF : 11 Pages
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L5971
Figure 9. Switching frequency vs. junction
temperature.
fsw
(KHz)
D97IN785
105
100
95
90
-50
0
50
100
Tj(°C)
Figure 11. Efficiency vs output voltage.
η
(%)
D98IN948
96
100KHz
94
200KHz
92
90
88
VCC=20V
IO=1.5A
86
84
82
0
5 10 15 20 25 VO(V)
Figure 13. Efficiency vs output current.
η
(%)
D98IN950
90
VCC=8V
85
VCC=12V
VCC=18V
80
fsw=200KHz
VO=3.36V
75
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
Figure 10. 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 12. Efficiency vs. output current.
D98IN949
η
(%)
VCC=8V
90
VCC=12V
VCC=18V
85
80
fsw=200KHz
VO=5.1V
75
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
Figure 14. Efficiency vs. output current.
η
D98IN941
(%)
90
85
Vcc=8V
Vcc=12V
80
75
Vcc=18V
70
65
Fsw=200KHz
Vo=2.5V
60
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 Io(A)
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