AN2064 データシートの表示（PDF） - STMicroelectronics
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AN2064 Datasheet PDF : 14 Pages
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AN2064 - APPLICATION NOTE
Table 2: Telcordia GR1089 AC power fault test
First Level AC Power Fault Test
Test
Applied Voltage, 60Hz
Short Circuit Current
Duration
1
50VRMS
0.33A
15 minutes
2
100VRMS
0.17A
15 minutes
3 200VRMS, 400VRMS, 600VRMS
1A at 600V
60 Applications, 1 second each
4 (*)
1000VRMS
1A
60 Applications, 1 second each
5
NA
NA
60 Applications, 5 second each
6
600VRMS
0.5A
30 seconds each
7
440VRMS
2.2A
5 x 2 seconds each
8
600VRMS
3A
5 x 1.1 second each
9 (*)
1000VRMS
5A
0.5 second each
Second Level AC Power Fault Test
1
120VRMS, 277VRMS
25A
15 minutes
2
600VRMS
60A
5 seconds
3
600VRMS
7A
5 seconds
4
100VRMS-600VRMS
2.2A at 600V
15 minutes
(*) Primary protector in place (MDF)
Using series overcurrent protection, two technologies are available, PTCs and fuses.
PTCs are resistive elements that dissipate power when subjected to current, increasing their temperature
and making their resistance quickly increase (10Ω @ 25°C and 100kΩ @ 150°C for example). The nice
feature of the PTCs is that they are resettable but they have two main drawbacks. The first drawback is
its resistance and, as already mentioned, some applications like digital networks do not allow resistive el-
ements. The second drawback is linked to its tolerance, which makes it difficult to achieve line equilibrium
(longitudinal balancing).
Fuses do not have these resistive drawbacks, making them well suited for digital applications.
From the previous discussion we can conclude that the fuse must withstand first level surges for US (or A
criterion for Europe) but may operate for second level surge (or B criterion). As far as the US market is
concerned the fuse has to remain operational for the 10/1000µs 1kV 100A and the 2/10µs 2.5kV 500A
lightning surges. It must also withstand first level AC power faults while it must operate for 277VRMS 25A
and 600VRMS 60A second level AC power faults.
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