Datasheet

L4978
8/13
Figure 18. Efficiency vs. output current.
.
Figure 19. Efficiency vs. output current.
.
Figure 20. Efficiency vs. Vcc.
.
Figure 21. Power dissipation vs. Vcc.
.
Figure 22. Device Power dissipation vs. Vo
.
Figure 23. Pulse by pulse limiting current vs.
junction temperature..
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 I
O
(A)
60
65
70
75
80
85
90
η
(%)
D97IN740
V
CC
=8V
fsw=200KHz
V
O
=5.1V
V
CC
=12V
V
CC
=24V
V
CC
=48V
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 I
O
(A)
55
60
65
70
75
80
85
90
η
(%)
D97IN741
V
CC
=8V
fsw=200KHz
V
O
=3.36V
V
CC
=12V
V
CC
=24V
V
CC
=48V
Io=2A
0 102030405060
70
75
80
85
90
Vcc [V]
n [%]
Vo=5.1V fsw=100kHz
Vo=5.1V fsw=200kHz
Vo=3.36V fsw=100kHz
Vo=3.36V fsw=200kHz
Io=0.5A
Io=2A
Io=1A
0 102030405060
0
200
400
600
800
1000
Vcc [V]
Pdiss [mW]
Io=1.5A
Vo=5.1V
fsw=100kHz
Io=2A
Io=1A
0102030
0
200
400
600
800
1000
1200
1400
Vo [V]
Pdiss [mW]
Io=0.5A
Io=1.5A
Vcc=35V
fsw=100kHz
-50 -25 0 25 50 75 100 125 T
j(
˚C
)
2.3
2.4
2.5
2.6
2.7
2.8
2.9
Ilim
(A)
D97IN747
fsw=100KHz
V
CC
=35V