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參數(shù)資料
| 型號： | L7583A |
| 廠商： | Lineage Power |
| 英文描述： | Line Card Access Switch(線卡存取開關) |
| 中文描述： | 線卡接入交換機（線卡存取開關） |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 404K |
| 代理商： | L7583A |
Lucent Technologies Inc.
13
Data Sheet
November 1999
L7583A/B/C/D Line Card Access Switch
Protection
(continued)
Integrated SLIC Protection
(continued)
External Secondary Protector
With the above integrated protection features, only one
overvoltage secondary protection device on the loop
side of the L7583 is required. The purpose of this
device is to limit fault voltages seen by the L7583 so as
not to exceed the breakdown voltage or input-output
isolation rating of the device. To minimize stress on the
L7583, use of a foldback- or crowbar-type device is rec-
ommended. A detailed explanation and design equa-
tions on the choice of the external secondary protection
device are given in the An Introduction to L758X Series
of Line Card Access Switches Application Note. Basic
design equations governing the choice of external sec-
ondary protector are given below.
I
|
V
BATmax
| +
|
V
breakovermax
|
<
|
V
breakdownmin(break)
|
I
|
V
ringingpeakmax
|
+
|
V
BATmax
|
+
|
V
breakovermax
|
<
|
V
breakdownmin(ring)
|
I
|
V
ringingpeakmax
|
+
|
V
BATmax
|
<
|
V
breakovermin
|
where:
V
BATmax
—Maximum magnitude of battery voltage.
V
breakovermax
—Maximum magnitude breakover volt-
age of external secondary protector.
V
breakovermin
—Minimum magnitude breakover voltage
of external secondary protector.
V
breakdownmin(break)
—Minimum magnitude breakdown
voltage of L7583 break switch.
V
breakdownmin(ring)
—Minimum magnitude breakdown
voltage of L7583 ring access switch.
V
ringingpeakmax
—Maximum magnitude peak voltage of
ringing signal.
Series current-limiting fused resistors or PTCs should
be chosen so as not to exceed the current rating of the
external secondary protector. Refer to the manufac-
turer’s data sheet for requirements.
Table 15. Electrical Specifications, Protection Circuitry
* Previous versions of this data sheet specified a Trigger Current of 50 mA minimum. Trigger Current is defined as the minimum current drawn
from tip and ring to turn on the SCR. The specification in this data sheet is Gate Trigger Current, which is defined as the maximum current that
can flow into the battery before the SCR turns on.
Typical at 25 °C.
Twice ± dynamic current limit of break switches.
§ In some instances, the typical ON-state voltage can range as low as –25 V.
Parameters Related to Diodes (in Diode Bridge)
Test Condition
Apply ±dc current limit
of break switches
Apply ±dynamic cur-
rent limit of break
switches
Parameters Related to Protection SCR
—
—
—
Parameter
Measure
Forward
Voltage
Forward
Voltage
Min
—
Typ
—
Max
3
Unit
V
Voltage Drop @ Continuous Cur-
rent (50 Hz/60 Hz)
Voltage Drop @ Surge
Current
—
5
—
V
Surge Current
Gate Trigger Current*
Gate Trigger Current
Temperature
Coefficient
Hold Current
Gate Trigger Voltage
Reverse Leakage Current
ON-State Voltage
§
—
—
—
—
—
—
—
25
–0.5
A
50
—
mA
%/°C
—
—
—
—
V
ON
—
70
—
—
—
–3
–5
—
mA
V
μA
V
V
Trigger current
V
BAT
0.5 A, t = 0.5 μs
2.0 A, t = 0.5 μs
V
BAT
– 4
—
—
—
V
BAT
– 2
1.0
—
—
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