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L7591

更新时间: 2024-09-28 22:31:39
品牌 Logo 应用领域
杰尔 - AGERE 电路保护
页数 文件大小 规格书
8页 205K
描述
Subscriber Line Interface Circuit Protector

L7591 数据手册

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Data Sheet  
October 1997  
L7591 Subscriber Line Interface Circuit Protector  
Features  
Description  
Shunts lightning pulses to ground  
— Positive or negative 30 A, 10 x 1000 µs  
— Positive or negative 40 A, 5 x 320 µs  
— Positive or negative 80 A, 2 x 10 µs  
The L7591 Subscriber Line Interface Circuit (SLIC)  
Protector is designed to protect line-feed circuitry  
from fault-induced lightning and power-cross surge  
pulses. If a fault current forces TIP and/or RING to a  
more negative voltage than VS, current is conducted  
through the trip circuit. When the specified trip cur-  
rent level is reached, transistors PNPN1 and/or  
PNPN2 will turn on and "crowbar" the majority of the  
current to ground. If similar pulses force TIP and/or  
RING to a more positive state than ground, diodes  
D1 and/or D2 will conduct the pulse to ground. The  
L7591 SLIC Protector is available in an 8-pin, plastic  
DIP (L7591AB) and in an 8-pin, plastic SONB pack-  
age (L7591AS).  
Power-cross protection  
— 3.5 APEAK, 50 Hz to 60 Hz, 1 s  
— 5.0 APEAK, 50 Hz to 60 Hz, 10 ms  
Gate trigger current, 15 mA max  
Up to –80 V capability  
Holding current, 150 mA min  
Pin Information  
Table 1. Pin Description  
8
7
6
5
PT  
TIP  
1
2
3
4
(Applies to DIP and SONB packages)  
TRIP  
D1  
Pin Symbol  
Name/Function  
CIRCUIT  
PNPN1  
PNPN2  
1
2
TIP  
VS  
Tip signal from customer.  
VS  
GND  
GND  
PR  
Supply voltage to gate  
(–20 V to –80 V).  
3
4
5
RING  
PR  
Test Point, do not use.  
TEST  
POINT  
Ring signal from customer.  
TRIP  
CIRCUIT  
D2  
Protected ring signal to line-feed-  
circuitry.  
RING  
6
7
8
GND  
GND  
PT  
Device ground/fault current  
return.  
12-1590 (C)  
Device ground/fault current  
return.  
Figure 1. Functional and Pin Diagram  
Protected tip signal to line-feed  
circuitry.  
Note: Pins 1 and 4 must always be connected to the protection  
resistors shown in Figures 4 and 5 (Line Feed Circuitry).The  
SLIC can be connected either to the protected outputs (pins  
5 and 8) or to the inputs (pins 1 and 4).  

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