L4955 Просмотр технического описания (PDF) - STMicroelectronics
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L4955 Datasheet PDF : 14 Pages
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L4955
L4955
Figure 13: Ripple Rejection vs. Output Current
Figure 14: Power Good Function
R ipp le R e jec tio n [d B ]
100
90
F r ip p le = 1 2 0 H z
80
V rip p le= 3 V p -p
70
60
F r ip p le = 1 0 k H z
50
Vr ipp le= 0.5 V p -p
F r ip p le = 1 k H z
V ripp le= 0.5 V p -p
40
30
C in = 2 2 u F
20
C o u t= 2 2 u F
Vo ut= 1 .2 6 V
10
V in m in = 4 .5 V
F r ip p le = 5 0 k H z
V ripp le = 0 .5V p -p
0
0
1
2
3
4
5
Io u t [A ]
VADJ
0.9 VADJ
PG
Low
VOUT=VADJ (R1+R2)/R2
hyst = 200mV
t
High
Low
t
D96IN364B
Figure 15: Inhibit Function
VINH
Vref = 1.26V
hyst = 200mV
t
regulator
ON
regulator
OFF
regulator
ON
t
D96IN365A
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