參數(shù)資料
型號(hào)： LUCL8567AAU-DT
元件分類： 圓形連接器
英文描述： Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GT; No. of Contacts:4; Connector Shell Size:36; Connecting Termination:Solder; Circular Shell Style:Square Flange Receptacle; Body Style:Straight
中文描述： 為人民共和國(guó)的中國(guó)用戶接口的應(yīng)用
文件頁(yè)數(shù)： 29/42頁(yè)
文件大?。?/td> 701K
代理商： LUCL8567AAU-DT
Lucent Technologies Inc.
29
Data Sheet
August 1999
People’s Republic of China Applications
L8567 SLIC for
Applications
(continued)
Power Control—Auxiliary Battery
With the auxiliary battery technique under long loops,
the entire L8567 draws power from the higher-voltage
battery. As the loop length decreases and the loop
current increases or limits, the final output drive stage
of the L8567 SLIC will draw power from the lower-
voltage auxiliary battery. Thus, for a given loop, with a
given loop current requirement, the minimum battery
voltage is used by the L8567 SLIC, which minimizes
the total power consumed. During on-hook or open-
circuit conditions, the high battery is seen at tip and
ring.
All circuits on the L8567, other than the final output
drive stage, are powered by the higher-voltage battery
regardless of dc loop length. Thus, SLIC quiescent
power will be determined solely by the high-voltage
battery and will not be reduced under short dc loops.
Tip/ring voltage varies as a function of loop length,
decreasing with decreasing loop length. The battery
transition will occur when the tip/ring voltage is less
than V
BAT2
by a diode drop and a V
CE(SAT)
, or about 1 V.
Thus, the transition point from V
BAT1
to V
BAT2
may be
controlled by the choice of V
BAT2
. The relationship is
given below:
V
BAT2
= T
OH
+ R
DC(TIP)
* I
LOOP
+ 2 * R
PROT
* I
LOOP
+
R
LOOP
* I
LIM
+ R
DC(RING)
* I
LIM
+ (V
DIODE +
V
CE(SAT)
)
where:
V
BAT2
= magnitude of auxiliary battery.
T
OH
= overhead voltage tip to ground, typically 2.5 V.
R
DC(TIP)
= dc feed resistance on tip, typically 55
.
I
LOOP
= loop current. V
BAT2
will switch under short-loop
conditions where it is likely that the SLIC will be current
limiting; thus, I
LOOP
= I
LIM
.
R
PROT
= series protection resistance plus L758X resis-
tance, nominal 68
.
R
LOOP
= loop resistance for transition from V
BAT1
to
V
BAT2
.
I
LIM
= SLIC current limit set per resistor R
LIM
.
R
DC(RING)
= dc feed resistance on ring, typically 55
.
(V
DIODE +
V
CE(SAT)
) = internal voltage drop associated
with battery switch circuit, typically 1 V.
Thus, the equation may be rewritten:
V
BAT2
= 2.5 V + 55 I
LIM
+ 132 I
LIM
+ R
LOOP
I
LIM
+ 55 I
LIM
+
1 V
I
LIM
R
LOOP
=
– 242
Thus, for example, for a nominal loop transition at
700
, with a 25 mA current limit, V
BAT2
should be nom-
inal 27 V.
Power Control—32-Pin PLCC with Power
Control Resistor
This section is applicable if the user chooses to use a
single high-voltage battery with an external power con-
trol resistor. The power resistor is used in conjunction
with the 32-pin PLCC package.
Resistor R
PWR
is connected from pin PWR to the bat-
tery supply. This resistor limits the power that is dissi-
pated on the SLIC. dc loop current is shared between
the SLIC and R
PWR
, thus controlling the actual power
that is dissipated on the SLIC. The value and power rat-
ing of R
PWR
is determined by the thermal capabilities of
the L8567’s 32-pin PLCC package. The value and
power rating of R
PWR
is calculated as shown below.
The relationship for the power dissipated in the SLIC is
given by:
P
SLIC
= P
TOTAL
+ P
Q
– P
PROT
– P
PWR
– P
LOOP
(1)
Where:
P
SLIC
= the power dissipated in the SLIC.
P
TOTAL
= the total off-hook power dissipation.
P
Q
= the SLIC quiescent or on-hook power dissipation.
P
PROT
= the power dissipated in the protection resistors
(and L758X switch).
P
PWR
= the power dissipated in R
PWR
.
P
LOOP
= the power dissipated in the subscriber loop.
The relationships for the individual power dissipation
components are:
P
TOTAL
= I
LOOP
|V
BAT
|
(2)
P
Q
is the active state open loop power dissipation of
the L8567 SLIC and is specified in Table 4 on page 12.
P
PROT
= (I
LOOP
)
2
2R
P
(3)
P
PWR
=
(4)
P
LOOP
= V
LOOP
I
LOOP
(5)
Where:
I
LOOP
is the maximum dc loop current which is the dc
loop current limit that is set by resistor R
PROG
.
R
P
is the value of the protection resistor plus the resis-
tance of the L758X switch.
|V
BAT
| is the magnitude of the maximum battery volt-
age.
V
ROH
is the overhead voltage associated with the ring
lead.
V
LOOP
is the ring/tip loop voltage. This voltage is a func-
tion of the dc loop length or resistance. It will decrease
with decreasing loop resistance.
R
PWR
is the resistance of the external resistor R
PWR
.
--------------------------------
-------------------------------------------------------------------------
R
PWR
(
)
(
2
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