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參數(shù)資料
| 型號： | LUCL8560DAU-DT |
| 英文描述： | Low-Power SLIC with Ringing |
| 中文描述： | 低功耗振鈴用戶接口 |
| 文件頁數(shù)： | 26/46頁 |
| 文件大?。?/td> | 842K |
| 代理商： | LUCL8560DAU-DT |
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26
Lucent Technologies Inc.
Data Sheet
April 2000
L8560 Low-Power SLIC with Ringing
Applications
(continued)
Power Derating
(continued)
The power dissipated in the SLIC is the total power dis-
sipation less the power that is dissipated in the loop.
SLIC P
D
= Total power – Loop power
Loop power = (I
LIM
)
2
(R
LOOP(dc)
min + 2R
P
)
Loop power = (45 mA)
2
(100
+ 200
)
Loop power = 0.61 W
SLIC power = 2.507 W – 0.61 W
SLIC power = 1.897 W < 1.9 W
Thus, in this example, the thermal design ensures that
the SLIC will not enter the thermal shutdown state.
The next example uses the 32-pin PLCC package and
demonstrates the technique used to determine the
maximum allowed current.
In this example, assume a 0 °C to 70 °C operating
range. Thus,
T
TSD
– T
AMBIENT (max)
= allowed thermal rise
165 °C – 70 °C = 95 °C
To estimate the open-air thermal impedance, use the
43 °C/W parameter from the 44-pin PLCC and ratio the
lead count.
Thermal impedance (32-pin PLCC) = 48 °C/W
= 59 °C/W
Again:
Allowed thermal rise = thermal impedance
SLIC
power dissipation
95 °C = 59 °C/W
SLIC power dissipation
SLIC P
D
= 1.6 W
In this example, again assume the dc loop + 2
protec-
tion resistors = 300
, then:
(I
LIM
)(V
BAT
max) + P
Q
– (I
LIM
)
2
(R
dc
+ 2 R
P
) = 1.6 W
I
52 + 0.167 – I
2
300 = 1.6 W
300 I
2
– 52 I + 1.433 = 0
This is a quadratic equation whose solution is in the
form:
X =
I
LIM
=
I
LIM
=
Ignore the “+” term:
600
I
LIM
=
Thus, 34 mA is the maximum allowable current limit in
the 32-pin PLCC package under the conditions given in
this example.
This type of analysis should be performed under the
conditions of the user’s particular application to ensure
adequate thermal design.
Battery Switch
The L8560 SLIC provides an input for an auxiliary bat-
tery. Called V
BAT2
, this power supply should be lower in
magnitude than the primary battery V
BAT1
. Under an
acceptable loop condition, V
BAT2
can be switched to
provide the loop power through the amplifiers of the
SLIC. The dc template, described in previous sections,
is determined by the battery that is active—either V
BAT1
or V
BAT2
.
There are several important applications where use of
a lower-voltage battery in the off-hook state is desired
to provide dc current to the loop, yet a higher-voltage
battery is desired in on-hook or ringing modes. These
applications are typically short-loop applications, such
as an ISDN terminal adapter, fiber-in-the-loop applica-
tions, or a cable telephony interface.
Typically, in these applications, the maximum dc loop
resistance (which includes the off-hook telephone
handset plus twisted-cable pair) is relatively low. For
example, Bellcore TA-909,
Generic Requirements and
Objectives for Fiber in the Loop Systems
, specifies that
in the off-hook state, 20 mA must be provided into a
430
dc loop. To meet these requirements, a lower
battery in the off-hook condition is important to mini-
mize off-hook power consumption. Power conservation
is important from a cost of energy point of view and is
vital in remotely powered POTS interface applications.
While use of a low-voltage battery in off-hook short dc
loops is important, certain on-hook applications, such
as providing a balanced power ring signal or maintain-
ing compatibility with certain CPE such as answering
machines, may require a higher magnitude battery.
With the logic-controlled battery switch, the L8560 is
able to provide a higher-voltage battery to meet on-
hook battery voltage requirements. At the same time,
the L8560 can accept a lower-voltage auxiliary battery
during short-loop, off-hook applications. If a dc/dc con-
verter with two fixed voltage outputs is used, tie the
battery voltage that is higher in magnitude to V
BAT1
and
the voltage that is lower in magnitude to V
BAT2
. If it is
32
------
b
2
±
–b
4ac
–
2a
2
--------------------------------------------------------------------------------
2(300)
600
52 31.4
52 – 31.4
34 mA
=
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