AN2266 STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 16
Technical content
Datasheet sections
- 1 Telecom disturbances
- 2 LCP concept
- 3 LCP topology based protection family
- 4 Long line protection
- 5 Short line protection
- 6 Conclusion
- 7 Revision history
1 Telecom disturbances
subjected to over voltages. These transients are mainly due to three kinds of disturbances. 50/60 Hz mains network, while the third one is produced by electrostatic discharge (ESD). Figure 3. Line disturbance location of a duration of between 0.2 s to 15 min. case the surge is defined as a 10/700 µs voltage waveform.
2 LCP concept
Figure 6. LCP152xx concept behavior Table 1. IEC61000-4-2 ESD surge standard
- “X” is a level to be defined
3 LCP topology based protection family
the gate pin. This voltage can be within the range from 0 to -150 V for the LCP152xx. Figure 8. LCP152xx circuit and electrical characteristic knee of the negative part is controlled by the Gn gate bias. Figure 9. LCP02-150xx circuit and electrical characteristic
4 Long line protection
core of the system is a huge central office from where many lines connect the subscribers. on SLIC with integrated ring generator. Figure 10. SLIC with external ring signal management other is located between the ring relay and the SLIC. than the maximum ring voltage trip. for a voltage higher than the supply voltage of the SLIC. very sensitive to the latch-up phenomena. The recommended value is then 20 or 30 Ω.
5 Short line protection
generation of high voltage SLIC circuit which can be either single or double voltage. Figure 20. Short line application using high voltage SLIC Figure 21. Short line application using SLIC with positive and negative voltages
6 Conclusion
network. For both long and short line applications, the protection is one of the major issues.
7 Revision history
Table 2. Document revision history 25-Mar-2014 2 Updated trademark statement.