R3612 Datasheet, PDF (1/16 Pages) Power Innovations Ltd – PROGRAMMABLE OVERVOLTAGE PROTECTOR FOR ERICSSON COMPONENTS 3357/3 DCLIC

Copyright © 1997, Power Innovations Limited, UK
R3612
PROGRAMMABLE OVERVOLTAGE PROTECTOR
FOR ERICSSON COMPONENTS 3357/3 DCLIC
DECEMBER 1995 - REVISED SEPTEMBER 1997
OVERVOLTAGE PROTECTION FOR ERICSSON COMPONENTS LINE INTERFACE CIRCUITS
q PBA 3357/3 DCLIC Overvoltage Protector
q Dual Voltage-Programmable Protector
- Wide 0 to -70 V Programming Range
- Low Voltage Overshoot Crowbar and Diode
- Low 5 mA max. Triggering Current
- Does not Charge Gate Supply
- Specified for 0°C to 70°C Operation
- Plastic Dual-in-line Package
q Rated for International Surge Wave Shapes
WAVE SHAPE
STANDARD
I_TSP
A
2/10 µs
TR-NWT-001089
80
0.5/700 µs RLM88
38
10/700 µs K17, K20, K21
38
10/1000 µs TR-NWT-001089
30
P PACKAGE
(TOP VIEW)
(Tip) K1 1
(Gate) G 2
8 K1 (Tip)
7 A (Ground)
NC 3
6 A (Ground)
(Ring) K2 4
5 K2 (Ring)
MD6XAV
NC - No internal connection
Terminal typical application names shown in
parenthesis
device symbol
K1
G
K2
description
The R3612 is a dual forward-conducting buffered
p-gate over voltage protector in a plastic DIP
package. It is designed to protect the Ericsson
Components PBA 3357/3 DCLIC (Dual Channel
Complete Line Interface Circuit) against over
voltages on the telephone line caused by
lightning, a.c. power contact and induction. The
R3612 limits voltages that exceed the DCLIC
supply rail voltage.
The DCLIC line driver section is powered from
0 V (ground) and a negative voltage in the region
of -44 V to -56 V. The protector gate is connected
to this negative supply. This references the
protection (clipping) voltage to the negative
supply voltage. As the protection voltage will
track the negative supply voltage the over
voltage stress on the DCLIC is minimised.
Positive over voltages are clipped to ground by a
low voltage overshoot diode. Negative over
voltages are initially clipped close to the DCLIC
negative supply rail value. If sufficient current is
available from the over voltage, then the
protector will crowbar into a low voltage on-state
condition. As the over voltage subsides the high
holding current of the crowbar prevents d.c.
latchup.
The buffered gate design reduces the loading on
the DCLIC supply during over voltages caused
A
SD6XAE
Terminals K1, K2 and A correspond to the alternative
line designators of T, R and G or A, B and C. The
negative protection voltage is controlled by the voltage,
V_GG, applied to the G terminal.
by power cross and induction. The gate
characteristic is designed to produce a net
current drain on the interface circuit voltage
supply during low level power cross or induction.
This removes the need for a separate clamping
diode across the voltage supply.
These monolithic protection devices are
fabricated in ion-implanted planar vertical power
structures for high reliability and in normal
system operation they are virtually transparent.
Characteristic values for the R3612 are
measured either at the extremes of the DCLIC
recommended operating voltage range (-44 V to
-56 V) or at the DCLIC maximum rated supply
voltage (-70 V).
PRODUCT INFORMATION
Information is current as of publication date. Products conform to specifications in accordance
with the terms of Power Innovations standard warranty. Production processing does not
necessarily include testing of all parameters.
1