L4955 데이터 시트보기 (PDF) - STMicroelectronics
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L4955 Datasheet PDF : 14 Pages
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L4955
L4955
Figure 1: L4955 DC Operating Area
Figure 2: Output Voltage Stability vs. Junction
Temperature
O u tput C ur rent [A ]
8
7
C urr ent Lim itation
6
Vin > 4.5V
Tj = 125°C
Vo u t [V ]
1 .28
1 .27 5
1 .27
V in = 1 2 V
Io u t= 1 0 m A
5
Rdson
4
lim it
3
Pow er D is sipation Lim it
Tc = 25°C
Pdmax = 40W
2
D C O perating Area
1
Tc = 70°C
0
Pdm ax = 22W
0 2.5 5 7.5 10 12.5 15 17.5 20 22.5
(V in - Vou t) [V ]
Figure 3: Line Regulation vs. Junction
Temperature
5
4.5
4
3.5
4.5V <Vin<2 2V
Iout=10m A
3
2.5
2
1.5
1
0.5
0
-40 -20 0 20 40 60 80 100 120 140 160
T j [°C]
Figure 5: Dropout Voltage
1 .25
1
0 .75
0 .5
T j = 125 °C
T j = 25 °C
T j = -40 °C
0 .25
P u ls e d te c h n iq ue h a s b e e n u s e d
0
0
1
2
3
4
5
6
Iout [A]
1 .26 5
1 .26
1 .25 5
1 .25
1 .24 5
1 .24
-40
0
40
80
T j [°C ]
Figure 4: Load Regulation
120
160
5
4
V in = 12 V
T j = 25 °C
3
(P uls ed techn iqu e h as b ee n used )
2
Vo ut = VAD J
1
0
-1
-2
-3
-4
-5
0
1
2
3
4
5
Io ut [A ]
Figure 6: Maximum OutputCurrent vs. Junction
Temperaturewith internalcurrent limiting
O utput Current [A]
10
9
8
7
6
5
4
(Vin-Vout) > 2V
3
pin 2 = GND
2
1
0
-40 -20 0 20 40 60 80 100 120 140 160
Tj [°C]
*Pulsed tecnique has been used
5/14
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