參數(shù)資料
型號： L8567
英文描述： SLIC for Peoples Republic of China Applications
中文描述： 為人民共和國的中國用戶接口的應(yīng)用
文件頁數(shù)： 32/42頁
文件大小： 701K
代理商： L8567
32
Lucent Technologies Inc.
Data Sheet
August 1999
People’s Republic of China Applications
L8567 SLIC for
Applications
(continued)
Power Considerations
(continued)
Table 21. R
PWR
= 4400
Table 22. R
PWR
= 2310
(R
PWR
= 2200
+ 5%)
Table 23. R
PWR
= 2090
(R
PWR
= 2200
– 5%)
Power Control—44-Pin PLCC Package
With the 44-pin PLCC, the thermal impedance of the
package is probably enough to ensure the SLIC ther-
mal shutdown temperature is not exceeded. Power cal-
culations, as illustrated below, should be made to
ensure design margin.
The still-air thermal resistance of the 44-pin PLCC is
47 °C/W; however, this number implies zero airflow as if
the L8567 were totally enclosed in a box. A more realis-
tic number would be 43 °C/W. This is an experimental
number that represents a thermal impedance with no
forced airflow (i.e., from a muffin fan), but from the nat-
ural airflow as seen in a typical switch cabinet.
The SLIC will enter the thermal shutdown state at typi-
cally 165 °C. The thermal shutdown design should
ensure that the SLIC temperature does not reach
165 °C under normal operating conditions.
Assume a maximum ambient operating temperature of
85 °C, a maximum current limit of 45 mA, and a maxi-
mum battery of –52 V. Further, assume a (worst case)
minimum dc loop of 100
and that 100
protection
resistors are used at both tip and ring.
1. T
TSD
– T
A(max)
= allowed thermal rise.
165 °C – 85 °C = 80 °C
2. Allowed thermal rise = package thermal
impedance
SLIC power dissipation.
80 °C = 43 °C/W
SLIC power dissipation
SLIC power dissipation (P
D
) = 1.9 W
Thus, if the total power dissipated in the SLIC is less
than 1.9 W, it will not enter the thermal shutdown state.
Total SLIC power is calculated as:
Total P
D
= Maximum battery
Maximum
current limit + SLIC quiescent power.
For the L8567, SLIC quiescent power (P
Q
) is approxi-
mated at 0.167 W. Thus,
Total P
D
= (–52 V
45 mA) + 0.167 W
Total P
D
= 2.34 W + 0.167 W
Total P
D
= 2.507 W
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
dcLOOP
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.
P
SLIC
(W)
1.682555
1.558691
1.423464
1.276873
1.118918
0.9496
0.768918
0.576873
0.373464
0.158691
V
LOOP
(V)
5
10
15
20
25
30
35
40
45
50
R
PWR
(
)
4400
4400
4400
4400
4400
4400
4400
4400
4400
4400
P
PWR
(W)
0.502045
0.400909
0.311136
0.232727
0.165682
0.11
0.065682
0.032727
0.011136
0.000909
P
SLIC
(W)
1.228323
1.195964
1.141959
1.06631
0.969016
0.850076
0.709492
0.547262
0.363388
0.157868
V
LOOP
(V)
5
10
15
20
25
30
35
40
45
50
R
PWR
(
)
2310
2310
2310
2310
2310
2310
2310
2310
2310
2310
P
PWR
(W)
0.956277
0.763636
0.592641
0.44329
0.315584
0.209524
0.125108
0.062338
0.021212
0.001732
P
SLIC
(W)
1.127662
1.115581
1.079576
1.019648
0.935796
0.828021
0.696322
0.5407
0.361155
0.157686
V
LOOP
(V)
5
10
15
20
25
30
35
40
45
50
R
PWR
(
)
2090
2090
2090
2090
2090
2090
2090
2090
2090
2090
P
PWR
(W)
1.056938
0.844019
0.655024
0.489952
0.348804
0.231579
0.138278
0.0689
0.023445
0.001914
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