LE75181CBSC 参数 Datasheet PDF下载

Le75181

Data Sheet

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:

•

•

•

|

V

BATmax

| +

|

V

breakovermax

|

<

|

V

breakdownmin(break)

|

|

V

ringingpeakmax

| +

|

V

BATmax

|

+

|

V

breakovermax

|

<

|

V

breakdownmin(ring)

|

|

V

ringingpeakmax

|

+

|

V

BATmax

|

<

|

V

breakovermin

|

where:

V

BATmax

—Maximum magnitude of battery voltage.

V

breakovermax

—Maximum magnitude breakover voltage of external secondary protector.

V

breakovermin

—Minimum magnitude breakover voltage of external secondary protector.

V

breakdownmin(break)

—Minimum magnitude breakdown voltage of Le75181 break switch.

V

breakdownmin(ring)

—Minimum magnitude breakdown voltage of Le75181 ring access switch.

V

ringingpeakmax

—Maximum magnitude peak voltage of ringing signal.

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.

Table 7. Electrical Specifications, Protection Circuitry

Parameters Related to Diodes (in Diode Bridge)

Parameter

Voltage Drop at Continuous Current

(50 Hz/60 Hz)

Voltage Drop at Surge Current

Test Condition

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

Measure

Forward

Voltage

Forward

Voltage

—

—

—

—

—

—

—

—

V

ON

—

Min

—

—

Typ

—

5

Max

3.5

—

Unit

V

V

Parameters Related to Protection SCR

Surge Current

Gate Trigger Current (Le75181A)*

†

Gate Trigger Current (Le75181C)*

†

Gate Trigger Current

†

Temperature

Coefficient

Hold Current (Le75181A)

Hold Current (Le75181C)

Gate Trigger Voltage

Reverse Leakage Current

ON-State Voltage

§

—

—

—

—

70

110

VBAT – 4

—

—

—

—

25

33

–0.5

—

—

—

—

–3

–5

VBAT – 2

1.0

—

—

‡

A

mA

mA

%/°C

mA

mA

V

µA

V

V

50

70

—

* 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.

11

Zarlink Semiconductor Inc.