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参数资料
| 型号： | W671552P |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 模拟传输电路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 3/42页 |
| 文件大小： | 1230K |
| 代理商： | W671552P |
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W671500 SERIES
The curve of Figure 4 determines the actual loop current for a given set of loop conditions. The loop
conditions are determined by the low battery voltage and the DC loop impedance. The DC loop
impedance is the sum of the protection resistance, copper loop resistance (ohms/foot) and the
telephone off hook DC resistance.
R
LOOP
()
R
KNEE
I
LIM
I
LO
OP
(m
A)
I
SC
I
A
I
B
2R
P
FIGURE 3: ILOOP -VS- RLOOP LOAD CHARACTERISTIC
The slope of the feed characteristic and the battery voltage define the maximum loop current on the
shortest possible loop as the short circuit current ISC.
ISC
ILIM
V
T R OC
(
)
2R
PILIM
1.1e4
-------------------------------------------------------
+
=
(EQ. 7)
The term ILIM is the programmed current limit, 1760/RIL. The line segment IA represents the constant
current region of the loop current limit function.
IA ILIM
VTR OC
(
)
RLOOPILIM
1.1e4
----------------------------------------------------------------
+
=
(EQ. 8)
The maximum loop impedance for a programmed loop current is defined as RKNEE.
RKNEE
VTR OC
(
)
ILIM
------------------------
=
(EQ. 9)
When RKNEE is exceeded, the device will transition from constant current feed to constant voltage,
resistive feed. The line segment IB represents the resistive feed portion of the load characteristic.
IB
VTR OC
(
)
RLOOP
------------------------
=
(EQ. 10)
7.1.7. Impedance Matching
The impedance of the device is programmed with the external component RS. RS is the gain setting
resistor for the feedback amplifier that provides impedance matching. If complex impedance matching
is required, then a complex network can be substituted for RS.
Publication Release Date: April 2004
- 11 -
Revision 1.0
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