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參數(shù)資料
| 型號： | L9311 |
| 英文描述： | Line Interface and Line Access Circuit Full-Feature SLIC with High Longitudinal Balance, Ringing Relay,and GR-909 Test Access |
| 中文描述： | 線路接口和線路接入電路全功能用戶接口高縱向平衡，振鈴繼電器，和GR - 909測試訪問 |
| 文件頁數(shù)： | 29/50頁 |
| 文件大?。?/td> | 852K |
| 代理商： | L9311 |
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Data Sheet
July 2001
Ringing Relay, and GR-909 Test Access
L9311 Full-Feature SLIC with High Longitudinal Balance,
Agere Systems Inc.
29
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. L9311 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 L9311 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.
-----------------------------------
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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