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E-L4971D013TR Datasheet(PDF) 7 Page - STMicroelectronics

Part No. E-L4971D013TR
Description  1.5A STEP DOWN SWITCHING REGULATOR
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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 7 page
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7/13
L4971
Figure 12. Switching Frequency vs. input
voltage.
Figure 13. Switching frequency vs. junction
temperature.
Figure 14. Dropout voltage between pin 5 and 4
Figure 15. Efficiency vs output voltage.
Figure 16. Efficiency vs. output current.
Figure 17. Efficiency vs. output current.
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
5
10
15
20
25
VO(V)
82
84
86
88
90
92
94
96
η
(%)
D97IN737
100KHz
VCC=35V
IO=1.5A
200KHz
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
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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