Datasheet

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