le75181 Zarlink Semiconductor, le75181 Datasheet - Page 11

• Manufacturer Part Number: le75181
• Description: Ringing Access Switch
• Manufacturer: Zarlink Semiconductor

protection device are given in the An Introduction to Le758X Series of Line Card Access Switches application note. Basic design
equations governing the choice of external secondary protector are given below:
•
•
•
where:
V
V
V
V
V
V
Series current-limiting fused resistors or PTC resistors should be chosen so as not to exceed the current rating of the external
secondary protector. Refer to the manufacturer’s data sheet for specifications.
Voltage Drop at Continuous Current
(50 Hz/60 Hz)
Voltage Drop at Surge Current
Surge Current
Gate Trigger Current (Le75181A)*
Gate Trigger Current (Le75181C)*
Gate Trigger Current
Coefficient
Hold Current (Le75181A)
Hold Current (Le75181C)
Gate Trigger Voltage
Reverse Leakage Current
ON-State Voltage
* 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.
ringingpeakmax
BATmax
breakovermax
breakovermin
breakdownmin(break)
breakdownmin(ring)
|
|
|
V
V
V
BATmax
ringingpeakmax
ringingpeakmax
—Maximum magnitude of battery voltage.
Table 7. Electrical Specifications, Protection Circuitry
—Minimum magnitude breakover voltage of external secondary protector.
—Maximum magnitude breakover voltage of external secondary protector.
| +
Parameter
—Maximum magnitude peak voltage of ringing signal.
§
|
V
—Minimum magnitude breakdown voltage of Le75181 ring access switch.
breakovermax
†
| +
|
—Minimum magnitude breakdown voltage of Le75181 break switch.
Temperature
+
|
|
V
V
BATmax
BATmax
†
†
|
<
|
|
+
<
|
V
|
|
V
breakdownmin(break)
V
breakovermax
breakovermin
Parameters Related to Diodes (in Diode Bridge)
Apply ±dc current limit of
break switches
Apply ±dynamic current
limit of break switches
—
—
—
—
—
—
Trigger current
VBAT
0.5 A, t = 0.5 µs
2.0 A, t = 0.5 µs
Parameters Related to Protection SCR
Test Condition
Zarlink Semiconductor Inc.
|
|
<
|
V
|
breakdownmin(ring)
11
Forward
Voltage
Forward
Voltage
Measure
V
—
—
—
—
—
—
—
—
—
ON
|
VBAT – 4
Min
110
70
—
—
—
—
—
—
—
—
—
–0.5
Typ
—
25
33
—
—
–3
–5
—
—
—
5
VBAT – 2
Max
3.5
1.0
—
50
70
—
—
—
‡
%/°C
Unit
mA
mA
mA
mA
µA
V
V
A
V
V
V