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參數(shù)資料
| 型號： | L7556 |
| 英文描述： | Low-Power SLICs with Battery Switch |
| 中文描述： | 低功耗SLIC組件的電池開關(guān) |
| 文件頁數(shù)： | 18/28頁 |
| 文件大小： | 700K |
| 代理商： | L7556 |
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18
Lucent Technologies Inc.
Data Sheet
January 2000
with Battery Switch
L7556, L7557 Low-Power SLICs
Applications
(continued)
Characteristic Curves
(continued)
12-3015 (F)
Note: V
BAT
= –48 V.
Figure 17. Loop Closure Program Resistor
Selection
12-3016a (F)
Notes:
Tip lead is open.
V
BAT
= –48 V.
Figure 18. Ring Ground Detection Programming
12-3050.a(F)
Notes:
V
BAT1
= –48 V.
V
BAT2
= –28 V.
I
LIM
= 22 mA.
R
dc1
= 115
.
Figure 19. Loop Current vs. Loop Voltage
12-3051.a(F)
Notes:
V
BAT1
= –48 V.
V
BAT2
= –28 V.
I
LIM
= 22 mA.
R
dc1
= 115
.
Figure 20. Loop Current vs. Loop Resistance
0
5
20
25
0
10
20
30
60
LOOP CLOSURE THRESHOLD RESISTOR, R
LCTH
(k
)
50
15
10
40
O
(
RING GROUND CURRENT
DETECTION RESISTOR, R
ICM
(k
)
T
(
35
30
25
20
15
10
5
0
0
50
100
150
200
250
0
10
20
50
0
20
30
40
50
LOOP VOLTAGE (V)
30
40
10
L
1
10 k
I
LIM
–1
Rdc
1
L7556
BS = 0
BS = 1,
L7557 BS = 0
LOOP RESISTANCE, R
LOOP
(W)
0
500
1000
2000
0
20
30
40
50
1500
10
L
L7556
BS = 0
BS = 1,
L7557 BS = 0
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