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L4971D Datasheet(PDF) 8 Page - STMicroelectronics

Part # L4971D
Description  1.5A STEP DOWN SWITCHING REGULATOR
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4971D Datasheet(HTML) 8 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
(%)
D97IN740
VCC=8V
fsw=200KHz
VO=5.1V
VCC=12V
VCC=24V
VCC=48V
Figure 15. Efficiencyvs. output current.
0.0 0.2
0.4
0.6
0.8
1.0
1.2 1.4 IO(A)
55
60
65
70
75
80
85
90
η
(%)
D97IN741
VCC=8V
fsw=200KHz
VO=3.36V
VCC=12V
VCC=24V
VCC=48V
Figure 16. Efficiency vs. output current.
0
1020
3040
50
VCC(V)
70
75
80
85
η
(%)
D97IN742
V
0=5.1V-f
SW=100KHz
IO=1.5A
V
0
=5.1V-f
SW=200KHz
V
0=3.36V-f
SW =100KHz
V
0
=3.36V-f
SW
=1
200KHz
Figure 17. Efficiencyvs. Vcc.
0
102030
4050
VCC(V)
0
200
400
600
800
Pdiss
(mW)
D97IN743
IO=1.5A
VO=5.1V
fsw=100KHz
IO=1A
IO=0.5A
Figure 18. Power dissipation vs. Vcc.
0
5
10
15
20
25
30 V0(V)
0
200
400
600
800
Pdiss
(mW)
D97IN744
IO=1.5A
VCC=35V
fsw=100KHz
IO=1A
IO=0.5A
Figure 19. Efficiencyvs. Vo.
-50 -25
0
25
50
75
100 125 Tj(
°C)
2.3
2.4
2.5
2.6
2.7
2.8
2.9
Ilim
(A)
D97IN747
fsw=100KHz
VCC=35V
Figure 20. Pulse by pulse limiting current vs.
junction temperature.
L4971
8/12



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