TISP4219H3BJR 查看數據表（PDF） - Bourns, Inc

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TISP4219H3BJR

LCAS RING AND TIP PROTECTION PAIRS BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS

Bourns, Inc 

TISP4xxxH3/M3BJ Series for LCAS Protection

APPLICATIONS INFORMATION

Introduction

These protector pairs have been designed to limit the peak voltages on the line terminals of ‘7581/7582/7583 LCAS (Line Card Access Switch)

parts. An LCAS may also be referred to as a Solid-State Relay, SSR, i.e. a replacement of the conventional electro-mechanical relay.

The ‘7581 LCAS has two solid-state switches which connect the telephone line to the line card SLIC (Subscriber Line Interface Circuit), Figure

12, SW1 and SW2. A further two solid-state switches connect the telephone ringing generator to the line, Figure 12, SW3 and SW4. Applied

5-volt logic signals control the condition of the switches to perform the functions of line disconnect, connection to the SLIC and application of

ringing. If excessive long-term overdissipation occurs, a thermal sensor activates thermal shutdown and opens the switches. The SLIC side of

switches SW1 and SW2 is limited in voltage by internal protectors Th3 and Th4. The line-side of the LCAS is voltage limited by the two TISP®

parts.

TISP4125M3

OR

TISP4125H3

TIP

RING

RELAY

SLIC

RELAY

SLIC

Th1

SW3

SW1

Th3

Th2

RING

TISP4219M3

OR

TISP4219H3

SW4

LCAS

Th4

SW2

Vbat

AI4XAQ

R2

R1

V RING

VBAT

SW5a SW5b

RING

GENERATOR

Figure 12. Basic LCAS Arrangement

Additional functions are provided by the ‘7582 (line test access) and the ‘7583 (test-in and test-out access). Up to three conventional electro-

mechanical relays may be replaced by the LCAS. The resulting size reduction can double the line density of a line card.

This document covers the types of overvoltage protection required by the ’7581 LCAS and how the TISP® part voltages are selected to

provide these requirements. The LCAS ’7582 and ’7583 are also covered as the additional switches used in these parts are similar to the

’7581.

JUNE 2001 – REVISED FEBRUARY 2005

Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

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