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参数资料
| 型号： | W671310P |
| 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： | 4/48页 |
| 文件大小： | 1344K |
| 代理商： | W671310P |
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W671300 SERIES
During normal operation, the error current (IERR) is zero and the output voltage is determined by the
signal current (ISIG) multiplied by the 200 K feedback resistor. With the current polarity as shown for
ISIG, the output voltage moves positive with respect to half battery. Assuming the amplifier output is
driving a load at a more negative potential, the amplifier output will source current.
During excessive output source current flow, the scaled output current (IO/K) exceeds the reference
current (IREF) forcing an error current (IERR). With the polarity as shown the error current subtracts from
the signal current, which reduces the amplifier output voltage. By reducing the output voltage the
source current to the load is decreased and the output current is limited.
7.1.5.4. Setting the Propoer Transient Current Limit
Since this feature programs the maximum output current of the device, the setting must be high
enough to allow for detection of Ring Trip or programmed off-hook loop current, whichever is greater.
To allow for proper Ring Trip operation, the transient current limit setting should be set at least 25%
higher than the peak Ring Trip current setting. Setting the transient current 25% higher should
account for programming tolerances of both the Ring Trip threshold and the transient current limit.
If loop current is larger than Ring Trip current (Low REN applications) then the transient current limit
should be set at least 35% higher than the loop current setting. The slightly higher offset accounts for
the slope of the loop current limit function.
Attention to detail should be exercised when programming the transient current limit setting. If Ring
Trip detect does not occur while ringing, re-examine the transient current limit and Ring Trip threshold
settings.
7.1.6. DC Loop Feed
The feedback mechanism for monitoring the DC portion of the loop current is the loop detector. A low
pass filter is used in the feedback to block voice band signals from interfering with the loop current
limit function. The pole of the low pass filter is set by the external capacitor CDC and its value should
be 4.7F, 6.3V rated polarized or non-polarized capacitor.
Most applications will operate the device from low battery while off-hook. The DC feed characteristic of
the device will drive Tip and Ring towards half battery to regulate the DC loop current. For light loads
or long loops, Tip will be near -4V and Ring will be near VVBL + 5V. The following diagram illustrates
the DC feed characteristic.
m = (V
TR /IL ) = 11.1k
I
LOOP
(mA)
I
LIM
V
TR(OC)
V
TR
,
D
C
(V)
LONG LOOP
SHORT LOOP
FIGURE 2: DC FEED CHARACTERISTIC
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