L4978
Figure 12. Switching Frequency vs. input
voltage..
fsw
(KHz)
107.5
105.0
102.5
100.0
88
D97IN735
Figure 15. Efficiency vs output voltage.
.
[%]
98
96
94
92
fsw=100kHz
fsw=200kHz
Tj=25˚C
90
97.5
95.0
92.5
90.0
0
5 10 15 20 25 30 35 40 45 50 V
CC
(V)
86
84
82
80
Vcc=35V
Io=2A
0
5
10
15
Vo [V]
20
25
30
Figure 13. Switching frequency vs. junction
temperature.
fsw
(KHz)
D97IN785
Figure 16. Efficiency vs. output current.
.
[%]
95
Vcc=8V
Vcc=12V
90
105
85
Vcc=24V
80
100
75
Vcc=48V
70
95
65
fsw=100kHz
Vo=5.1V
90
-50
0
50
100
Tj(˚C)
60
0
0.2 0.4 0.6 0.8
1 1.2 1.4 1.6 1.8
Io [A]
2
2.2
Figure 14. Dropout voltage between pin 5 and
4.
∆
V
(V)
0.7
0.6
Tj=125˚C
D98IN836
Figure 17. Efficiency vs. output current.
.
[%]
95
90
85
Vcc=8V
0.5
Tj
=2
C
5˚
80
75
Vcc=12V
0.4
Vcc=24V
0.3
0.2
0.1
0.0
Tj=-25˚C
70
65
60
Vo=3.36V
fsw=100kHz
Vcc=48V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 I
O
(A)
0
0.2 0.4 0.6 0.8
1 1.2 1.4 1.6 1.8
Io [A]
2
2.2
7/13
STMICROELECTRONICS [ STMICROELECTRONICS ]
