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SMTHDTXX Datasheet(PDF) 3 Page - STMicroelectronics

Part No. SMTHDTXX
Description  TRISILTM DISCRETE SOLUTION FOR ISDN PROTECTION
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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SMTHDTXX Datasheet(HTML) 3 Page - STMicroelectronics

   
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REFERENCE TEST CIRCUIT FOR IH,IBO and VBO parameters :
static
relay.
R1
R2
240
140
D.U.T
VBO
measure
I, I
BO
H
measure
Tp = 20ms
K
Transformer
220V/ 800V
5A
Auto
Transformer
220V/2A
Vout
TEST PROCEDURE :
Pulse Test duration (Tp = 20ms):
- For Bidirectional devices = Switch K is closed
- For Unidirectional devices = Switch K is open.
VOUT Selection
- Device with VBR
≤ 150 Volt
-VOUT = 250 VRMS,R1 = 140
Ω.
- Device with VBR
≥ 150 Volt
-VOUT = 480 VRMS,R2 = 240
Ω.
FUNCTIONAL HOLDING CURRENT (IH) TEST CIRCUIT = GO - NOGO TEST.
D.U.T
Switch
Vp =
1KV
20
Surge Generator
10/700
sec
Vp =1KV / Ipp = 25A
F
A
K
50
25
15
220nF
Vbat = 48V
This is a GO-NOGO Test which allows to confirm the holding current (IH) level in a functional test
circuit. This test can be performed if the reference test circuit can’t be implemented.
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 = 25A , 10/700
µs.
3) The D.U.T will come back to the OFF-State within a duration of 50 ms max.
SMTHDTxx
3/6


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