L4978 Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
L4978 Datasheet PDF : 13 Pages
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L4978
Figure 18. Efficiency vs. output current.
.
η
D97IN740
(%)
VCC=8V
90
VCC=12V
85
VCC=24V
80
VCC=48V
75
70
fsw=200KHz
VO=5.1V
65
60
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
Figure 19. Efficiency vs. output current.
.
η
(%)
D97IN741
90
VCC=8V
85
VCC=12V
80
VCC=24V
75
70
VCC=48V
65
fsw=200KHz
VO=3.36V
60
55
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
Figure 20. Efficiency vs. Vcc.
.
n [%]
90
Vo=5.1V fsw=100kHz
85
Vo=5.1V fsw=200kHz
Vo=3.36V fsw=100kHz
80
Vo=3.36V fsw=200kHz
75
Io=2A
70
0
10
20
30
40
50
60
Vcc [V]
8/13
Figure 21. Power dissipation vs. Vcc.
.
Pdiss [mW]
1000
Vo=5.1V
fsw=100kHz
800
Io=2A
600
Io=1A
Io=1.5A
400
Io=0.5A
200
0
0
10 20 30 40 50 60
Vcc [V]
Figure 22. Device Power dissipation vs. Vo
.
Pdiss [mW]
1400
Vcc=35V
1200 fsw=100kHz
Io=2A
1000
800
Io=1.5A
600
Io=1A
400
Io=0.5A
200
0
0
10
20
30
Vo [V]
Figure 23. Pulse by pulse limiting current vs.
junction temperature..
Ilim
D97IN747
(A)
fsw=100KHz
2.9
VCC=35V
2.8
2.7
2.6
2.5
2.4
2.3
-50 -25 0 25 50 75 100 125 Tj(˚C)
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