TP120N データシートの表示（PDF） - STMicroelectronics

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TP120N

Tripolar protection for ISDN interfaces

STMicroelectronics 

Characteristics

Figure 5.

Reference test circuit 1

Auto

Transformer

220 V / 2 A

tp = 20 ms

Static

relay

VOUT

K

IBO, IH

measure

R1

140 Ω

R2

240 Ω

D.U.T.

VBO

measure

Transformer

220 V / 800 V

2A

TEST PROCEDURE

Pulse test duration (tp = 20 ms):

● for Bidirectional devices = Switch K is closed

● for Unidirectional devices = Switch K is open

VOUT selection:

● Device with VBO < 200 V ➔ VOUT = 250 VRMS, R1 = 140 Ω

● Device with VBO > 200 V ➔ VOUT = 480 VRMS, R2 = 240 Ω

Figure 6. Functional holding current (IH) test circuit 2

R

VBAT = - 48 V

D.U.T.

- VP

Surge generator

TPI

This is a GO-NOGO test which allows to confirm the holding current (IH) level in a

functional test circuit.

TEST PROCEDURE

1/ Adjust the current level at the IH value by short circuiting the AK of the D.U.T.

2/ Fire the D.U.T. with a surge current ➔ IPP 10 A, 10/1000 µs.

3/ The D.U.T. will come back off-state within 50 ms maximum.

4/9

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