L4978
Figure 9. Switching Frequency vs. input
voltage.
fsw
(KHz)
107.5
105.0
102.5
100.0
97.5
95.0
92.5
90.0
0
5 10 15 20 25 30 35 40 45 50 V
CC
(V)
Tj=25°C
D97IN735
Figure 10. Switching frequency vs. junction
temperature.
fsw
(KHz)
D97IN785
105
100
95
90
-50
0
50
100
Tj(°C)
Figure 11. Dropout voltage between pin 5
and 4.
∆
V
(V)
0.7
0.6
D98IN836
Figure 12. Efficiency vs output voltage.
η
[%]
98
96
fsw=100kHz
Tj=125°C
94
92
fsw=200kHz
0.5
Tj
C
5
°
=2
90
88
0.4
0.3
0.2
0.1
0.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 I
O
(A)
Tj=-25°C
86
84
82
80
Vcc=35V
Io=2A
0
5
10
15
Vo [V]
20
25
30
Figure 13. Efficiencyvs. output current.
η
[%]
95
Vcc=8V
Vcc=12V
Figure 14. Efficiencyvs. output current.
η
[%]
95
90
85
Vcc=8V
90
85
Vcc=24V
Vcc=12V
80
80
75
70
fsw=100kHz
Vo=5.1V
Vcc=24V
75
Vcc=48V
70
65
65
60
Vcc=48V
Vo=3.36V
fsw=100kHz
60
0
0.2 0.4 0.6 0.8
1 1.2 1.4 1.6 1.8
Io [A]
2
2.2
0
0.2 0.4 0.6 0.8
1 1.2 1.4 1.6 1.8
Io [A]
2
2.2
7/12
STMICROELECTRONICS [ STMICROELECTRONICS ]
