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參數(shù)資料
| 型號： | L8560 |
| 英文描述： | Low-Power SLIC with Ringing |
| 中文描述： | 低功耗振鈴用戶接口 |
| 文件頁數(shù)： | 30/46頁 |
| 文件大?。?/td> | 842K |
| 代理商： | L8560 |
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Data Sheet
April 2000
L8560 Low-Power SLIC with Ringing
30
Lucent Technologies Inc.
Applications
(continued)
Power Ringing
(continued)
At the trip point, the internal current repeater will force I
RTSP
to be equal to I
RTSN
and V
RTSP
will be equal to V
RTSN
,
which is –8.2 V. Thus, at the trip point:
Thus:
Solving for V
DCOUT
, the voltage at DCOUT at the ring trip point is given by:
The loop current at ring trip is given by:
I
LOOP(TRIP)
= (V
DCOUT
)/(
β
DCOUT
)
For the L8560, the gain (
β
) at pin DCOUT is 41.67 V/A.
Capacitors C
2
and C
4
, along with resistors R
2
and R
4
, respectively, form low-pass filters to filter the ac voltage seen
at DCOUT before it is applied to the ring trip comparator input. The lower the pole of the filter, the less the ripple,
but also the slower the state transition at NSTAT. Poles in the neighborhood of 2.5 Hz—3 Hz are suggested, as
given by:
f
LP
=
f
LP
=
In the reference designs discussed in the next section, the ring trip threshold is set for 50 mA with:
R
1
= 210 k
R
2
= 124 k
C
2
= 0.1
μ
F
R
3
= 562 k
R
4
= 351 k
C
4
= 0.1
μ
F
Except for L8560CAU, the internal voltage for L8560CAU is –5.7 V. 133 k
should be used for R
1
.
I
RTSN
---------------------------------------------------------------------
R
--------+
V
DCOUT
8.2 V
–
(
)
–
R
1
+
R
3
------------------
R
2
15 k
+
+
=
I
RTSN
I
RTSP
0
8.2
–
(
R
4
)
–
=
=
3
+
1
R
3
R
1
+
3
---R
R
1
-------R
V
DCOUT
8.2 V
+
R
3
---R
R
2
15 k
+
+
R
4
8.2 V
=
V
DCOUT
8.2 R
3
R
1
+
)
1
+
R
1
R
4
R
3
R
4
-------------R
2
R
3
R
4
----R
R
3
R
4
15 k
R
3
--1
–
+
+
=
(
TRIP
)
2
π
R
2
C
2
2
π
R
4
C
4
-----------------------
-----------------------
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