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参数资料
| 型号： | W671340P |
| 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： | 3/48页 |
| 文件大小： | 1344K |
| 代理商： | W671340P |
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W671300 SERIES
limit function is provided by sensing line current and reducing the voltage drive to the load when the
externally set threshold is exceeded, hence forcing a constant source or sink current.
7.1.5.1. Transient Source Current Programming
The source current is externally programmed as shown below.
RTL
1780
ISRC
-------------
=
(EQ. 4)
For example a source current limit setting of 95mA is programmed with a 18.7k
resistor connected
between pin TL and ground. This setting determines the maximum amount of current which flows from
Tip to Ring during an off-hook event until the DC loop current limit responds. In addition this setting
also determines the amount of current which will flow from Tip or Ring when external battery faults
occur.
7.1.5.2. Transcient Sink Current Programming
The sink current limit is internally offset 20% higher than the externally programmed source current
limit setting.
ISNK
1.20 ISRC
×
=
(EQ. 5)
If the source current limit is set to 95mA, the sink current limit will be 114mA. This setting will
determine the maximum current that flows into Tip or Ring when external ground faults occur.
7.1.5.3. Understanding Transient Current Limit
Each tip and ring amplifier is designed to limit source current and sink current. The diagram below
shows the functionality of the circuit for the case of limiting the source current. A similar diagram
applies to the sink current limit with current polarity changed accordingly.
TIP or RING
+
-
I
REF
= 1.21/TL
I
O
I
O /K
I
ERR
I
SIG
20
200K
VB/2
FIGURE 1: CURRENT LIMIT FUNCTIONAL DIAGRAM
Publication Release Date: March 2004
- 11 -
Revision 0.5
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