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L4976 Datasheet(PDF) 6 Page - STMicroelectronics

No. de pieza L4976
Descripción Electrónicos  1A STEP DOWN SWITCHING REGULATOR
PDF  11 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4976 Datasheet(HTML) 6 Page - STMicroelectronics

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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
Figure 11. Efficiencyvs. output current.
0
5
10
15
20
25
VO(V)
82
84
86
88
90
92
94
96
η
(%)
D97IN737
100KHz
VCC=35V
IO=1.5A
200KHz
Figure 9. Efficiency vs output voltage.
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
Figure 8. Dropout voltage between pin 5 and 4.
0.0
0.2
0.4
0.6 0.8
1.0
1.2
1.4 IO(A)
60
65
70
75
80
85
90
η
(%)
D97IN738
VCC=8V
fsw=100KHz
VO=5.1V
VCC=12V
VCC=24V
VCC=48V
Figure 10. Efficiency vs. output current.
-50
0
50
100
Tj(
°C)
90
95
100
105
fsw
(KHz)
D97IN785
Figure 7. Switching frequency vs. junction
temperature.
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
(%)
D97IN740
VCC=8V
fsw=200KHz
VO=5.1V
VCC=12V
VCC=24V
VCC=48V
Figure 12. Efficiency vs. output current.
L4976
6/11



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