L4971
Figure 15. Efficiencyvs. output current.
η
(%)
90
85
80
V
CC
=48V
V
CC
=12V
V
CC
=24V
D97IN740
Figure 16. Efficiencyvs. output current.
η
(%)
90
85
80
75
70
V
CC
=48V
V
CC
=8V
V
CC
=12V
V
CC
=24V
D97IN741
V
CC
=8V
75
70
65
60
fsw=200KHz
V
O
=5.1V
65
60
fsw=200KHz
V
O
=3.36V
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 I
O
(A)
55
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 I
O
(A)
Figure 17. Efficiencyvs. Vcc.
η
(%)
V
0
=5
.1V-f
SW
=1
Figure 18. Power dissipation vs. Vcc.
D97IN742
Pdiss
(mW)
V
O
=5.1V
fsw=100KHz
D97IN743
00KH
z
85
V
0
=
800
5.1
V-f
V
0
=
SW
=
20
0K
Hz
00K
600
Hz
I
O
=1.5A
I
O
=1A
80
3.36
V-
V
V-f
0
=3
SW
=
1
.36
f
S
400
I
O
=0.5A
W
=
75
12
0
0K
I
O
=1.5A
Hz
200
70
0
10
20
30
40
50 V
CC
(V)
0
0
10
20
30
40
50
V
CC
(V)
Figure 19. Efficiencyvs. Vo.
Pdiss
(mW)
V
CC
=35V
fsw=100KHz
D97IN744
Figure 20. Pulse by pulse limiting current vs.
junction temperature.
Ilim
(A)
2.9
2.8
2.7
fsw=100KHz
V
CC
=35V
D97IN747
800
I
O
=1.5A
600
I
O
=1A
400
2.6
2.5
2.4
I
O
=0.5A
200
0
0
5
10
15
20
25
30 V
0
(V)
2.3
-50 -25
0
25
50
75 100 125 Tj(°C)
8/12
STMICROELECTRONICS [ STMICROELECTRONICS ]
