參數(shù)資料
型號： L9310
英文描述： Line Interface and Line Access Circuit Full-Feature SLIC,Ringing Relay,and Test Access Device
中文描述： 線路接口和線路接入電路全功能用戶接口，振鈴繼電器，測試接入設(shè)備
文件頁數(shù)： 33/60頁
文件大?。?/td> 1053K
代理商： L9310
Data Sheet
July 2001
Full-Feature SLIC, Ringing Relay, and Test Access Device
L9310 Line Interface and Line Access Circuit
Agere Systems Inc.
33
Applications
(continued)
dc Characteristics
(continued)
Automatic Battery Switch
Use of the automatic battery switch controls power dis-
sipation by automatically switching to the lower-voltage
auxiliary battery under short dc loop conditions, thus
reducing the short-loop power that is generated. This
has the advantage of not only controlling device tem-
perature rise, but reducing overall power dissipation.
The switch will automatically apply the appropriate bat-
tery to support the dc loop. No logic control is needed
to control the switch. Switching is quiet, and the dc loop
current will not be interrupted when switching between
batteries. The lower-voltage auxiliary battery is con-
nected to the V
BAT2
/PRW package pin.
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 12.
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 12. L9310 Loop/Battery Current (with
Battery Switch) vs. Loop Resistance
-----------------------------------
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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