TSI220B1 datasheet(3/9 Pages) STMICROELECTRONICS

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TSIxxB1

3/9

The VRM value corresponds to the maximum

voltage of the application in normal operation. For

instance, if the maximum line voltage is ranging

between

100VRMS of ringing plus 48V of battery

voltage, then the protection chosen for this applica-

tion shall have a VRM close to 200V.

The VBO is the triggering voltage. This indicates

the voltage limit for which the component

short-circuits. Passing this VBO makes the device

turn on.

The IBO is the current that makes the device turn

on. Indeed, if we want a Trisil to be turned on not

only the voltage across it shall pass the VBO value

but the current through it shall also pass the IBO

value.

In other words, if a voltage surge occurring on the

line is higher than the VBO value of a Trisil,

whereas the line surge current is limited to a value

that does not exceed the Trisil’s IBO value, then the

Trisil will never turn into short circuit. At this time

the surge will be clamped by the Trisil.

Anyhow the electronic circuitry located after the

Trisil will always be protected whatever the Trisil

state is (crowbar or clamping mode).

The IH stands for the holding current. When the

Trisil is turned on, as soon as the crossing current

surge gets lower than this IH value, the Trisil

protection device turns back in its idle state.

Remark : for this reason the Trisil ‘s IH value shall

be chosen higher than what the maximum telecom

line current can be.

TSIxxB1

BEHAVIOUR

WITH

REGARD

SURGE STANDARD :

The TSIxxB1 is able to replace both diode bridge

and

usual

discrete

protection

telecom

terminals. Furthermore it complies with the CCITT

K17 recommendations :

10/700

µs waveform surge test,  1.5kV

AC power induction test

AC power contact test

ELECTRICAL PARAMETERS

Ω

Fig. 2 : Test circuit for the CCITT K17 recommendations

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