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參數(shù)資料
| 型號(hào)： | L7591 |
| 英文描述： | Subscriber Line Interface Circuit Protector |
| 中文描述： | 用戶線接口電路保護(hù) |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大小： | 208K |
| 代理商： | L7591 |
Data Sheet
October 1997
L7591 Subscriber Line Interface Circuit Protector
Features
I
Shunts lightning pulses to ground
— Positive or negative 30 A, 10 x 1000
— Positive or negative 40 A, 5 x 320
— Positive or negative 80 A, 2 x 10
μ
s
μ
s
s
μ
I
Power-cross protection
— 3.5 A
PEAK
— 5.0 A
PEAK
, 50 Hz to 60 Hz, 1 s
, 50 Hz to 60 Hz, 10 ms
I
Gate trigger current, 15 mA max
I
Up to –80 V capability
I
Holding current, 150 mA min
Pin Information
Table 1. Pin Description
(Applies to DIP and SONB packages)
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).
Description
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 V
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).
S
, current is conducted
12-1590 (C)
Figure 1. Functional and Pin Diagram
Pin
1
2
Symbol
TIP
V
Name/Function
Tip signal from customer.
Supply voltage to gate
(–20 V to –80 V).
Test Point, do not use.
Ring signal from customer.
Protected ring signal to line-feed-
circuitry.
Device ground/fault current
return.
Device ground/fault current
return.
Protected tip signal to line-feed
circuitry.
S
3
4
5
—
RING
PR
6
GND
7
GND
8
PT
1
2
3
4
8
7
6
5
TIP
V
S
TEST
RING
PT
GND
GND
PR
PNPN1
PNPN2
D1
D2
CTRIP
CTRIP
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