TSI220B1 datasheet(5/9 Pages) STMICROELECTRONICS

5 / 9 page

TSIxxB1

5/9

This test simulates the induction phenomena that

can happen between telecom lines and AC mains

lines (fig. 4).

TEST # 2

AC POWER INDUCTION TEST

Fig. 4 : AC power induction test circuit

Part #1

test conditions :

VRMS = 240 V

R = 600

Ω

t = 0.2 s

Part #2

test conditions :

VRMS = 600 V

R = 600

Ω

t = 0.2 s

Fig. 5 : Voltage at the + and - terminations of the

TSI200B1, and current through it

while test part 1 is applied.

The TSIxxB1 withstand the AC power induction

test in both cases.

This test simulates the direct contact between the

telecom lines and the AC mains lines.

The AC power contact test consists in applying

240VRMS through a 10

Ω PTC during 15 minutes

long on the device under test. The CCITT K17

recommendation specifies an internal generator

impedance allowing 10 ARMS when in short circuit.

The behavior of the TSI200B1 with respect to this

surge is given in figure 6.

TEST #3

AC POWER CONTACT TEST

Fig. 6 : Voltage at the TSI200B1+&- terminations

and the current through it.

The figure 6 shows that after 250ms there is no

current anymore flowing through the TSI200B1

device. This is due to the action of the serial PTC

that limits the current through the line. This PTC is

mandatory for this test. It can also be replaced by a

fuse or any other serial protection that “opens” the

line loop under AC contact test.

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