參數(shù)資料
型號(hào)： PBL38773/1ML
廠商： INFINEON TECHNOLOGIES AG
元件分類： 模擬傳輸電路
英文描述： TELECOM-SLIC, PQCC32
封裝： PLASTIC, VQFN-32
文件頁數(shù)： 35/64頁
文件大?。?/td> 1052K
代理商： PBL38773/1ML
Ringing FlexiSLIC
PBL 38773/1
Battery Feed and Automatic Battery Switching
Data Sheet
40
DS1, 2003-06-18
6.2
Resistive Feed Region
See Figure 12, curve segment C-D-E.
For
V
TR > |VTB| - 5.7 V the PBL 38773/1 emulates resistive loop feed with feed resistance
equal to 2
× 25 . The slope of the resistive feed region is made steep to extend the
constant current region as close to the talk battery voltage (
V
TBAT) as possible.
6.3
On-Hook Region
See Figure 12, curve segment E-G-H-J.
For loop currents
I
L < 5.5 mA the PBL 38773/1 automatically switches to feed loop
current from the ring battery,
V
BAT. The switch from talk battery, VTBAT, to ring battery,
V
BAT, occurs without hysteresis at point E in Figure 12. For loop currents IL within the
on-hook range 0 mA <
I
L < 5.0 mA (curve segment G-H-J) the line voltage remains nearly
constant. This feature maintains a high on-hook voltage in the presence of DC line
leakage currents or when a subscriber device consumes some current from the battery
feed, e.g. to power displays. The On-hook voltage tracks the
V
BAT voltage up to |54.5| V,
V
TROpen = |VBAT| - 4.5 V. For VBAT higher than |54.5| V the On-hook voltage is limited to
|50| V typical.
In the presence of leakage currents
I
LLk < 5 mA during on-hook: (Figure 12, curve
segment G-H-J).
V
TROn-hook = VTROpen - ILLk × RFeed where RFeed = 2 × 25
6.4
Optimizing
V
TB
To optimize
V
TB with actual load on the line:
V
TB = (RLMax + RFEED + 2RF) × ILProg + VF + 3.7, where:
Example:
R
Lmax = 600 , RF = 40 , ILProg = 26.8 mA. This will give a VTB of 24 V.
R
Lmax
Is the maximum loop length including Off-hook phone load
R
Feed
2
× 25
R
F
Is the resistance of one fuse resistor.
I
LProg
Is the programmed line current.
V
F
Is the forward voltage of D
TB. Normal value is 0.7 V.
相關(guān)PDF資料
PDF描述
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