L4955 Просмотр технического описания (PDF) - STMicroelectronics
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L4955 Datasheet PDF : 14 Pages
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L4955
L4955
Figure 7: Short-circuit Current vs. Junction
Temperature with Programmable
Current Limiting
S h o r t-circ uit C u rre nt [A ]
3 .5
3
R lim = 1 3 kΩ
2 .5
2
R lim = 1 9 k Ω
1 .5
1
0 .5
R lim = 4 7 k Ω
0
-40 -20 0 2 0 4 0 60 80
T j [°C]
* P u ls ed te c ni q u e h as b e e n u s e d
100 120 140 160
Figure 9: Quiescent Current vs. Supply voltage
(CL = 0V)
Iq [m A ]
5
Figure 8: Quiescent Current vs. Temperature
(CL = 0V)
Iq [m A ]
2 .6
2 .4
2 .2
2
1 .8
1 .6
1 .4
1 .2
1
0 .8
0 .6
V in = 1 2 V
Io u t=1 0 m A to 5 A
0 .4
-4 0 -2 0 0
20 40 6 0 80 100 1 20 140 160
T j [° C ]
Figure 10: Quiescent Current vs. Supply Voltage
with Programmable Current Limiting
Iq [mA]
5
4 .5
4
3 .5
Io = 1 0m A to 5 A
4.5 Tj = 25°C
4
3.5
3
2 .5
2
1 .5
1
3
2.5
T j= - 4 0 °C
2
T j= 2 5 °C
T j= 1 2 5 ° C
1.5
1
Rli m = 13kΩ
Rlim = 47kΩ
0 .5
0.5
0
0
0
5
10
15
20
25
0
V in [V ]
5
10
15
20
25
Vin [V]
Figure 11: Stand-by Current vs. Supply Voltage
Figure 12: Ripple Rejection vs. Frequency
with INH = LOGIC HIGH
Iq [u A]
400
R i p p le R e je c tio n [d B ]
1 00
350
300
250
200
T j= 2 5 ° C
90
V rip p le = 3 V p -p V rip p le = 0 .5 V p - p
80
70
60
50
150
100
50
0
0
40
C in = 2 2 u F
30
C out = 2 2uF
Vout = 1.26V
20
V in m in = 4 .5 V
Io ut = 5 A
10
5
10
15
V in [V ]
20
25
0 10
100
1k
F r eq ue n cy [H z ]
10k
1 00 k
6/14
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