pbl386112sht ETC-unknow, pbl386112sht Datasheet - Page 13

• Manufacturer Part Number: pbl386112sht
• Description: Subscriber Line Interface Circuit
• Manufacturer: ETC-unknow

the VBat terminal minus the Battery Over
Head voltage, V
tion
at open loop conditions.
Resistive Loop Feed Region
The resistive loop feed (reference D in
figure 14) is programmed by connecting a
resistor R
VBAT according to the equation
Constant Current Region
The current limit (reference C in figure 14)
is adjusted by connecting a resistor, R
between terminal PLC and ground accord-
ing to the equation:
Battery Switch (VBAT2)
To reduce short loop power dissipation, a
second lower battery voltage may be con-
nected to the device through an external
diode at terminal VBAT2. The SLIC auto-
matically switches between the two battery
supply voltages without need for external
control. The silent battery switching occurs
when the line voltage passes the value
ond power supply via the diode D
13.
terminal VBAT and the VB2 power supply,
see figure 13, will make sure that the SLIC
continues to work on the second battery
even if the first battery voltage disappears.
V
V
Refer to table 2 for typical V
AOV-PIN NC
AOV-PIN to AGND
Table 2. The battery overhead voltages
R
R
|V
Connect the terminal VBAT2 to the sec-
An optional diode D
TRMax
TRMax
Feed
LC
Bat2
=
| - 40
=
(at I
is defined as the battery voltage on
I
500
LProg
R
400
SG
SG
L
•
, between terminals PSG and
I
= 0 mA) = |V
L
+ 40 + 2R
- 5.3
BOH
14
, according to the equa-
15
BB
connected between
F
Bat
| - V
V
BOH
BOH
BOH
B2
(typ) [V]
values.
in figure
3.7
3.2
LC
,
optional external power management re-
sistor, R
VBAT2-pin and the VBAT-pin to move pow-
er dissipation outside the chip.
agement resistor to locate the maximum
power dissipation outside the SLIC is ac-
cording to:
Metering Applications
It is very easy to use PBL 386 11/2 in
metering applications; simply connect a
suitable resistor (R
pacitor (C
metering source. Capacitor C
all DC-voltages that may be superimposed
on the metering signal. Choose 1/(2 R
bances from the metering puls generator.
The metering signal gain can be calculated
from the equation:
If the V
Calculation of the external power man-
R
G
Figure 12. Silent Polarity Reversal
5kHz to suppress low frequency distur-
Z
Z
PM
4-2Metering
T
M
=
•
PM
|V
B2
, may be connected between the
Bat
M
I
Z
LProg
) between pin RSN and the
=
RSN
T
| - 3
voltage is not available, an
- G
V
V
Z
TR
Meter
LM
2-4S
M
) in series with a ca-
•
=
(Z
LM
+ 2R
M
decouples
F
)
M
C
M
)
where
V
Z
G
line feeding characteristic and very strict
requirements (as mentioned earlier in chap-
ter “AOV in resistive loop feed region“), the
metering signal level should not exceed 1.6
V
will generate a transversal, and sometimes
audible, signal (which is not the case in the
constant current region).
Silent Polarity Reversal
The polarity reversal time can be adjusted
by connecting a capacitor between pin
SPR and AGND.
see figure 12.
ics for further information.
LM
Meter
RMS
2-4S
In metering applications with resistive
For an example in silent polarity reversal,
Please contact Ericsson Microelectron-
16
, since a reduction of the line current
is the voltage of the signal at the
metering generator,
is the line impedance seen by the
12 or 16 kHz metering signal,
is the transmit gain through the SLIC,
i e -0.5.
PBL 386 11/2
13