حفاظت مدار محدودکننده‌های ولتاژ گذرا (تی وی اس) تریستور محافظ اضافه‌ولتاژ (تی اس اس)

Product Attributes

Introduction

These devices are designed to limit overvoltages on the telephone and data lines. Overvoltages are normally caused by a.c. power system or lightning flash disturbances which are induced or conducted on to the telephone line. A single device provides 2-point protection and is typically used for the protection of ISDN power supply feeds. Two devices, one for the Ring output and the other for the Tip output, will provide protection for single supply analogue SLiCs. A combination of three devices will give a low capacitance protector network for the 3-point protection of ISDN lines. The protector consists of a voltage-triggered unidirectional thyristor with an anti-parallel diode. Negative overvoltages are initially clipped by breakdown clamping until the voltage rises to the breakover level, which causes the device to crowbar into a low-voltage onstate. This low-voltage on state causes the current resulting from the overvoltage to be safely diverted through the device. The high crowbar holding current helps prevent d.c. latchup as the diverted current subsides. Positive overvoltages are limited by the conduction of the antiparallel diode.

Applications

• Overvoltage protection for telephone and data lines
• Protection for ISDN power feed lines
• Protection for single-supply analog SLICs
• Low-capacitance protector network providing 3-point protection for ISDN lines
• Voltage limiting between two points
• Voltage limiting at multiple points in a circuit
• Maximum voltage protection for negative power supplies
• Maximum voltage protection for SLIC outputs
• Ringing and test protection
• Low-capacitance U-interface protection for ISDN lines