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參數資料
| 型號： | L9312 |
| 英文描述： | Line Interface and Line Access Circuit Forward Battery SLIC and Ringing Relay for TR-57 Applications |
| 中文描述： | 線路接口和線路接入電路轉發電池SLIC和振鈴繼電器的訓練班- 57應用 |
| 文件頁數： | 24/40頁 |
| 文件大小： | 709K |
| 代理商： | L9312 |
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Data Sheet
July 2001
Forward Battery SLIC and Ringing Relay for TR-57 Applications
L9312 Line Interface and Line Access Circuit
24
Agere Systems Inc.
Applications
(continued)
dc Characteristics
(continued)
Automatic Battery Switch
(continued)
The equation governing the switch point is as follows:
R
LOOP
=
–
2R
P
–
R
dc
A graph showing loop and battery current versus loop
resistance with use of the battery switch is shown in
Figure 11.
The V
BAT2
voltage must be chosen properly so that the
power dissipation is minimized. When the voltage at
pin PR equals V
BAT2
+ 1 V + (50
x I
LOOP
), at least
98% of the loop current minus 2.5 mA flows into V
BAT2
and 2.5 mA + 2% of the loop current plus quiescent
current flows into V
BAT1
.
To choose V
BAT2
, add:
1. Maximum tip overhead voltage (2 V for V
OVH
= 0).
2. Maximum loop voltage (maximum loop resistance,
protection resistance, and dc feed resistance
[100
] times the maximum loop current limit).
3. 1 V for the soft switch.
Thus, for a 40 mA current limit, 640
loop, 30
pro-
tection resistors, and 3.17 dBm signal (V
OVH
= 0):
V
BAT2
=
–
(2 + 0.042 x (100 + 60 + 640) + 1) =
–
36.6 V
Then, for any loop resistance from 0
to 640
, the
worst-case V
BAT1
and V
BAT2
currents will be:
I
BAT1
= 1.39 mA + 2.5 mA + 0.02 x (42 mA
–
2.5 mA) =
4.68 mA
I
BAT2
= (0.98) x 42 mA = 38.71 mA
Total max power = 1.641 W (V
BAT
=
–
48 V)
Note that to minimize power statistically, this may not
be the best choice for V
BAT2
. Over a large number of
lines, power is minimized according to the statistical
distribution of loop resistance.
12-3470a (F)
Figure 11. L9312 Loop/Battery Current (with Battery
Switch) vs. Loop Resistance
Power Control Resistor
Device temperature rise may be controlled with use of
a single battery voltage by use of a power control resis-
tor. This technique will reduce power dissipation on the
chip, by sharing the total power not dissipated in the
loop between the L9312 and the power control resistor.
It does not, however, reduce the total power con-
sumed, as does use of the auxiliary battery. The power
control resistor is connected from the primary battery to
the V
BAT2
/PWR node of the device.
The magnitude of the power control resistor must be
low enough to ensure that sufficient power is dissipated
on the resistor to ensure the L9312 does not exceed its
thermal shutdown temperature. At the same time, the
more power that is dissipated by the power control
resistor, the higher the resistor’s power rating must be,
and thus, the more costly the resistor. The following
equations are used to optimize the choice (magnitude
and power rating) of the power control resistor.
-----------------------------------
I
LIM
0
200
0.000
0.004
0.010
R
LOOP
(
)
400
B
600
1000
800
0.016
I
LOOPdc
I
BAT1
I
BAT2
0.002
0.006
0.012
0.018
0.008
0.014
0.020
0.022
0.024
0.026
0.028
0.030
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