E-L4971 STMicroelectronics, E-L4971 Datasheet - Page 8

• Manufacturer Part Number: E-L4971
• Description: Switching Converters, Regulators & Controllers 3.3 to 50V Step-Down
• Manufacturer: STMicroelectronics

Specifications of E-L4971

• Output Voltage: 3.5 V
• Mounting Style: Through Hole
• Package / Case: PDIP-8
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L4971
Figure 18. Efficiency vs. output current.
Figure 19. Efficiency vs. output current.
Figure 20. Efficiency vs. V
8/13
(%)
85
80
75
70
(%)
η
90
85
80
75
70
65
60
η
(%)
90
85
80
75
70
65
60
55
η
0
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 I
0.2 0.4 0.6 0.8 1.0 1.2 1.4 I
10
I
O
=1.5A
V
V
20
CC
CC
V
CC
V
=12V
=12V
V
CC
=48V
CC
V
=24V
CC
V
=24V
30
CC
=48V
=8V
CC
V
40
.
CC
fsw=200KHz
V
fsw=200KHz
V
O
O
=8V
=5.1V
=3.36V
50 V
D97IN742
D97IN741
D97IN740
O
CC
O
(A)
(A)
(V)
Figure 21. Power dissipation vs. Vcc.
Figure 22. Efficiency vs. V
Figure 23. Pulse by pulse limiting current vs.
Pdiss
(mW)
800
600
400
200
0
Pdiss
(mW)
Ilim
(A)
2.9
2.8
2.7
2.6
2.5
2.4
2.3
800
600
400
200
0
0
-50 -25
0
junction temperature.
10
5
0
10
20
fsw=100KHz
V
CC
25
=35V
15
50
30
V
fsw=100KHz
CC
I
O
20
O
=35V
V
fsw=100KHz
=1.5A
75 100 125 Tj(˚C)
O
=5.1V
I
40
O
I
=1.5A
25
O
=0.5A
I
O
I
I
O
=1A
O
=1A
=0.5A
D97IN747
50 V
30 V
D97IN744
D97IN743
0
CC
(V)
(V)