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SSRP130B1RL 데이터시트(PDF) 2 Page - STMicroelectronics |
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SSRP130B1RL 데이터시트(HTML) 2 Page - STMicroelectronics |
2 / 7 page Fig 1 : Topologyof the classical line card protection. APPLICATION INFORMATION Fig 2 : Classical use of the SSRP130B1. The classical line card requires protection before the ring relay and a second one for the SLIC (fig.1). The use of new SLICs with integrated ring generator or board based on solid state ring relay suppresses this second protection (Fig. 2). Then the only remaining stage, located between the line and the ring relay, has to optimize the protection. The classical symmetrical first stage protector becomes not sufficient to avoid any circuit destruction during surges. The SSRP130B1 device takes into account this fact and is based on asymmetrical voltage characteristics (Fig.3a). The ring signal being shifted back by the battery voltage, the SSRP130B1 negative breakover value Vbo- is greater than the positive one Vbo+. This point guarantees a protection operationvery close to the peak of the normal operating voltage without any disturbance of the ring signal. Fig 3 : SSRP130B1 electrical characteristics. I V Vbo- Vbo+ a : Line to ground characteristics. VBR - VBR -- b : Line to line characteristics. In addition with the 2 crowbar functions which perform the protection of both TIP and RING lines versus ground, a third cell assumes the differential mode protection of the SLIC. The breakdown voltage values of this third cell are the same for both positive and negative parts of the characteristics and are equivalent to the negative breakdown voltage value of the TIP and RING lines versus GND cells (Fig.3 b). PTC PTC R R SLIC SSRP130B1 Tip Ring (*) (*) SLIC with integrated ring generator or solid state relay. LINE 1st stage 2nd stage PTC PTC R R SLIC Ring generator Line Tip Ring SSRP130B1 2/7 |
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