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L4976 数据表(PDF) 9 Page - STMicroelectronics

部件名 L4976
功能描述  1A step down switching regulator
PDF  17 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4976 数据表(HTML) 9 Page - STMicroelectronics

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background image
L4976
Typical charcteristics
9/17
Figure 8.
Load regulation
Figure 9.
Switching frequency vs. input
voltage
Figure 10. Switching frequency vs.
junction temperature
Figure 11. Efficiency vs. output current
Figure 12. Dropout voltage between pin 5
and 4
Figure 13. Efficiency vs. output current
0
5 10 15 20 25 30 35 40 45 50 VCC(V)
3.370
3.371
3.372
3.373
3.374
3.375
3.376
3.377
VO
(V)
D97IN733
Tj=25˚C
Tj=125˚C
0
5 10 15 20 25 30 35 40 45 50 VCC(V)
90.0
92.5
95.0
97.5
100.0
102.5
105.0
107.5
fsw
(KHz)
D97IN735
Tj=25˚C
-50
0
50
100
Tj(˚C)
90
95
100
105
fsw
(KHz)
D97IN785
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4 IO(A)
0.0
0.1
0.2
0.3
0.4
0.5
∆V
(V)
Tj=25˚C
Tj=125˚C
D97IN736
Tj=-25˚C
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4 IO(A)
0.0
0.1
0.2
0.3
0.4
0.5
∆V
(V)
Tj=25˚C
Tj=125˚C
D97IN736
Tj=-25˚C
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4 IO(A)
60
65
70
75
80
85
90
η
(%)
D97IN739
VCC=8V
fsw=100KHz
VO=3.36V
VCC=12V
VCC=24V
VCC=48V



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