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參數資料
| 型號： | L8567-44PLCC |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數： | 31/42頁 |
| 文件大小： | 701K |
| 代理商： | L8567-44PLCC |
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Lucent Technologies Inc.
31
Data Sheet
August 1999
People’s Republic of China Applications
L8567 SLIC for
Applications
(continued)
Power Considerations
(continued)
Inserting values into equation 4:
P
PWR
=
P
PWR
=
(10)
At this point, the idea is to choose a value of R
PWR
, and
vary V
LOOP
from the on-hook value of approximately
50 V to the very short loop (~100
) value of 5 V in
both equations 9 and 10. For the choice of R
PWR
, the
relationship in equation 9 must be met to ensure that
sufficient power is dissipated in R
PWR
to ensure that
L8567 SLIC is not driven into thermal shutdown.
At the same time, for the choice of R
PWR
, equation 10
will tell what the power rating of R
PWR
needs to be.
Obviously, it is desirable to minimize P
PRW
in equation
10 to minimize the cost associated with component
R
PWR
.
An easy way to vary V
LOOP
for various values of R
PWR
is
to use a computer-based spreadsheet program.
Table 18 shows a spreadsheet for the choice of R
PWR
=
2600
. As shown, for this choice of resistor under
short loop conditions, the power dissipated in the SLIC
exceeds 1.33 W; thus, the SLIC may be driven into
thermal shutdown. Therefore, 2600
is not an appro-
priate choice of R
PWR
.
In Table 19, R
PWR
was reduced to 2200
. As shown in
this spreadsheet, under no loop conditions does the
SLIC power dissipation exceed 1.33 W. Thus, in terms
of SLIC power dissipation, 2200
is an appropriate
choice. Looking at the power dissipated in resistor
R
PWR
, the maximum power dissipation is 0.96 W, which
says a rating of 2 W (with margin) is appropriate for
2200
.
In Table 20, R
PWR
was further reduced to 1800
.
Again, with this choice, the SLIC power does not
exceed 1.33 W, so in terms of SLIC power dissipation,
1800
is also an appropriate choice. However, with
1800
, the power dissipated in R
PWR
under short loop
conditions exceeds 1 W, which suggests that for
1800
, the power rating of R
PWR
should be greater
than 2 W. Thus, while 1800
ensures the SLIC will not
be driven into thermal shutdown, because of the higher
power rating required compared to 2200
, 2200
is a
better choice.
In Table 21, R
PWR
was increased to 4400
. This is the
minimum value to get the power rating of R
PWR
to a
0.5 W resistor. However, with this choice of resistor, the
SLIC power will exceed 1.33 W; thus, 4400
is not
appropriate. This result suggests that the minimum
power rating of R
PWR
under the assumed conditions is
1 W.
Table 22 and Table 23 show results for 2200
with a
+
5% and –5% variation, respectively. These tables sug-
gest that a 5% tolerance is adequate for R
PWR
.
Table 18. R
PWR
= 2600
Table 19. R
PWR
= 2200
Table 20. R
PWR
= 1800
-------------------------------------------------------------------------
R
PWR
(
)
2
R
PWR
------------------------------------------------------
2
P
SLIC
(W)
1.334985
1.281138
1.208062
1.115754
1.004215
0.873446
0.723446
0.554215
0.365754
0.158062
V
LOOP
(V)
5
10
15
20
25
30
35
40
45
50
R
PWR
(
)
2600
2600
2600
2600
2600
2600
2600
2600
2600
2600
P
PWR
(W)
0.849615
0.678462
0.526538
0.393846
0.280385
0.186154
0.111154
0.055385
0.018846
0.001538
P
SLIC
(W)
1.180509
1.157782
1.112327
1.044145
0.953236
0.8396
0.703236
0.544145
0.362327
0.157782
V
LOOP
(V)
5
10
15
20
25
30
35
40
45
50
R
PWR
(
)
2200
2200
2200
2200
2200
2200
2200
2200
2200
2200
P
PWR
(W)
1.004091
0.801818
0.622273
0.465455
0.331364
0.22
0.131364
0.065455
0.022273
0.001818
P
SLIC
(W)
0.957378
0.9796
0.974044
0.940711
0.8796
0.790711
0.674044
0.5296
0.357378
0.157378
V
LOOP
(V)
5
10
15
20
25
30
35
40
45
50
R
PWR
(
)
1800
1800
1800
1800
1800
1800
1800
1800
1800
1800
P
PWR
(W)
1.227222
0.98
0.760556
0.568889
0.405
0.268889
0.160556
0.08
0.027222
0.002222
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