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參數(shù)資料
| 型號： | LUCL8567AP-DT |
| 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)： | 30/42頁 |
| 文件大?。?/td> | 701K |
| 代理商： | LUCL8567AP-DT |
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30
Lucent Technologies Inc.
Data Sheet
August 1999
People’s Republic of China Applications
L8567 SLIC for
Applications
(continued)
Power Control—32-Pin PLCC with Power
Control Resistor
(continued)
The maximum power that may be dissipated in the
SLIC
,
P
SLIC(MAX)
is given by
T
TSD
– T
A
= T
RISE
(6)
(7)
Where:
T
TSD
is the thermal protection shutdown temperature
and is specified in Table 4.
T
A
is the maximum ambient operating temperature.
T
RISE
is the maximum allowed SLIC temperature rise to
avoid driving the SLIC into thermal shutdown.
P
SLIC(MAX)
is the maximum allowed power that is dissi-
pated on the SLIC to avoid driving the SLIC into ther-
mal shutdown.
is the thermal resistance, junction to ambient of
the 32-pin PLCC package; it is specified in Table 4 on
page 12.
The approach to choosing the value and rating of R
PWR
follows. First use equations 6 and 7 to determine the
maximum allowed power that may be dissipated on the
SLIC without driving the SLIC into thermal shutdown.
Next consider equations 1 and 4. In both equation 1
and 4, pick a value of R
PWR
and for this value, or R
PWR
,
vary V
LOOP
from the open-circuit (on-hook) state volt-
age to the voltage seen at the minimum expected dc
loop length (100
). The idea is to use the SLIC power
dissipation value from equation 1, P
SLIC
, to ensure that
the maximum SLIC power dissipation value from equa-
tion 7, P
SLIC(MAX)
, is not exceeded for any value of loop
length. At the same time, using equation 4, try to mini-
mize the power dissipated in R
PWR
so as to choose the
minimum power rating of the resistor to minimize cost
associated with this resistor. This technique is illus-
trated in the following design example.
Power Considerations
R
PWR
Design Example:
Assume I
LOOP
= 45 mA. This assumes that a 40 mA
current limit is programmed by resistor R
PROG
set at
63.4 k
, plus a worst-case 15% tolerance that is speci-
fied in Table 5.
|V
BAT
| = 56 V.
2R
P
= 136
. This assumes use of 50
PTC in both
the tip and ring lead associated with the L7583 ON
resistance.
V
ROH
= 4 V (typical).
P
Q
= 165 mW as nominally specified in Table 4.
T
TSD
= 165
°
C per Table 4.
T
A
= 85
°
C.
= 60
°
C/W per Table 4.
V
LOOP
is varied from the open-circuit voltage of approx-
imately 50 V to the voltage at a 100
loop length,
approximately 5 V.
First, using equations 6 and 7, calculate the maximum
allowed power dissipation in the SLIC.
T
TSD
– T
A
= T
RISE
(6)
165
°
C – 85
°
C = 80
°
C
(7)
P
SLIC(MAX)
=
= 1.33 W
Given the choice of R
PWR
chosen, the value of P
SLIC
in
equation 8 must be less than 1.33 W for all loop lengths
(all values of V
LOOP
in equation 1). At the same time,
R
PWR
should be chosen to minimize P
PRW
from equa-
tion 4.
Inserting values into equation 1:
P
SLIC
≤
P
TOTAL
+ P
Q
– P
PROT
– P
PWR
– P
LOOP
(8)
From equation 2, 3, 4, 5
P
SLIC
≤
I
LOOP
|V
BAT
| + P
Q
– (I
LOOP
)
2
2R
P
–
– V
LOOP
I
LOOP
Inserting values:
1.33 W < (0.045)(56) + 0.165 W – [(0.045)
2
2(50 + 18)] –
–
(V
LOOP
)(0.045 mA)
(9)
P
SLIC MAX
)
T
JA
---------------
=
Θ
JA
Θ
JA
P
SLIC MAX
)
JA
---------------
=
----------------
-------------------------------------------------------------------------
R
PWR
(
)
2
R
PWR
------------------------------------------------------
2
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