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參數(shù)資料
| 型號： | W671340P |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 5/48頁 |
| 文件大?。?/td> | 1344K |
| 代理商： | W671340P |
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W671300 SERIES
The point on the y-axis labeled VTR(OC) is the open circuit Tip to Ring voltage and is defined by the feed
battery voltage.
VTR OC
(
)
VBL
9
=
(EQ. 6)
The curve of Figure 3 illustrates 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 LOOP
(m
A
)
I
SC
I
A
I
B
2R
P
LONG LOOP
SHORT LOOP
m=11.11k
m=Vtr(oc)/Rloop
CONSTANT CURRENT
CONSTANT VOLTAGE
OR
RESISTIVE FEED
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
11.11k
-------------------------------------------------------
+
=
(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
11.11k
----------------------------------------------------------------
+
=
(EQ. 8)
Process variations in the W671300 Family effect the ILIM and 11.11k slope in the above equation. All
units are tested with: a 300 load across tip and ring, VBAT=-24V and ILIM set to 25mA. The equation
can be used to predict the ideal current at this setting (25.76mA). All units are tested to be within
±8.5% of this ideal value (23.57mA to 27.95mA).
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,
Publication Release Date: March 2004
- 13 -
Revision 0.5
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