L4978 查看數據表（PDF） - STMicroelectronics
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L4978 Datasheet PDF : 13 Pages
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L4978
Figure 12. Switching Frequency vs. input
voltage..
fsw
(KHz)
107.5
D97IN735
105.0
102.5
100.0
Tj=25˚C
97.5
95.0
92.5
90.0
0 5 10 15 20 25 30 35 40 45 50 VCC(V)
Figure 13. Switching frequency vs. junction
temperature.
fsw
(KHz)
D97IN785
105
100
95
90
-50
0
50
100 Tj(˚C)
Figure 14. Dropout voltage between pin 5 and
4.
∆V
D98IN836
(V)
0.7
Tj=125˚C
0.6
0.5
Tj=25˚C
0.4
0.3
Tj=-25˚C
0.2
0.1
0.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 IO(A)
Figure 15. Efficiency vs output voltage.
.
[%]
98
96
fsw=100kHz
94
fsw=200kHz
92
90
88
86
84
Vcc=35V
82
Io=2A
80
0
5
10
15
20
25
30
Vo [V]
Figure 16. Efficiency vs. output current.
.
[%]
95
90
Vcc=12V
Vcc=8V
85
Vcc=24V
80
75
Vcc=48V
70
65
fsw=100kHz
Vo=5.1V
60
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
Io [A]
Figure 17. Efficiency vs. output current.
.
[%]
95
90 Vcc=8V
85
Vcc=12V
80
Vcc=24V
75
70
65
Vcc=48V
Vo=3.36V
fsw=100kHz
60
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
Io [A]
7/13
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