L4976 Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
L4976 Datasheet PDF : 17 Pages
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Typical charcteristics
L4976
Figure 14. Efficiency vs output voltage
η
(%)
D97IN737
96
100KHz
94
200KHz
92
90
88
VCC=35V
IO=1.5A
86
84
Figure 15. 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
82
0
5 10 15 20 25 VO(V)
60
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
Figure 16. Efficiency vs. output current Figure 17. Efficiency vs. Vo
η
D97IN741
Pdiss
(%)
(mW)
90
VCC=8V
800
85
VCC=12V
80
VCC=24V
600
75
400
70
VCC=48V
65
fsw=200KHz
VO=3.36V
200
60
VCC=35V
fsw=100KHz
D97IN744
IO=1.5A
IO=1A
IO=0.5A
55
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
0
0
5 10 15 20 25 30 V0(V)
Figure 18. Efficiency vs. VCC
η
D97IN742
(%)
V0=5.1V-fSW=100KHz
85
V0 =5.1V-fSW =200KHz
80
75
IO=1.5A
V0 =3V.03=6V3.-3fS6WV=-2fS0W0K=H1z00KHz
Figure 19. 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
70
0
10 20 30 40 50 VCC(V)
2.3
-50 -25 0 25 50 75 100 125 Tj(˚C)
10/17
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