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LCP3121 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. LCP3121
Description  OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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LCP3121 Datasheet(HTML) 4 Page - STMicroelectronics

   
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FUNCTIONAL HOLDING CURRENT (IH) TEST CIRCUIT : GO-NO GO TEST
0.01
0.10
1
10
100
1000
0
2
4
6
8
10
12
14
16
18
20
ITSM (A)
t(s)
F=50Hz
Tj initial = 25°c
Fig.
1:
Maximum
non
repetitive
surge
peak-on-state current versus overload duration.
-40
-20
0
20
40
60
80
100
120
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Tj(°C)
IH [Tj] / IH [Tj=25°C]
Fig. 2: Relative variation of holding current versus
junction temperature (typical values).
This is a GO-NO GO test which allows to confirm the holding current (IH) level in a functional test circuit.
TEST PROCEDURE :
- Adjust the current level at the IH value by short circuiting the D.U.T.
- Fire the D.U.T. with a surge current : IPP = 10A, 10/1000
µs.
- The D.U.T. will come back to the off-state within a duration of 50ms max.
R
Surge
generator
V
= -48 V
BAT
-VP
-VP
D.U.T


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