SGS Thomson Microelectronics TSI62B1, TSI265B1, TSI200B1, TSI220B1, TSI180B1 Datasheet
TSIxxB1
®
Telecom equipment requiring combin ed
protection against transient overvoltages and
rectification by diode bridge :
Telephone set
Base station for cordless s et
Fax machine
Modem
Caller Id equipment
Set top box
MAIN APPLICATION
SO8
The TSIxxB1 provides the diode bridge and the
crowbar protection function that can be found in
most of telecom terminal equipment.
Integrated monolithically within a SO8 package,
this ASD device allows space saving on the
board and greater reliability.
DESCRIPTION
CCITT K17 - K20
10/700µs 1.5 kV
5/310µs 38A
VDE 0433
10/700µs2 kV
5/310µs 40A(*)
CNET
0.5/700µs 1.5 kV
0.2/310µs 38A
Bellcore
TR-NWT-000974
: 10/1000µs1 kV
10/1000µs 30A(*)
FCC Part 68
2/10µs 2.5 kV
2/10µs 75A (*)
MIL STD883C Method 3015-6
(*) with series resistor or PTC.
IN ACCORDANCE WITH THE FOLLOWING
STANDARDS :
SCHEMATIC DIAGRAM
TERMINAL SET INTERFACE
PROTECTION AND DIODE BRIDGE
January 1998 - Ed: 3
Diode bridge for polarity guard and crowbar
protection within one device.
Single chip for greater reliability
Reduces component count versus discrete
solution
Saves space on the board
BENEFITS
STAND-OFF VOLTAGE FROM 62V TO 265V
PEAK PULSE CURRENT : 30 A (10/1000 µs)
MAXIMUM DC CURRENT : IF = 0.2 A
HOLDING CURRENT :150 mA
FEATURES
Application Specific Discretes
A.S.D.
TM: ASD is trademarks of SGS-THOMSON Microelectronics.
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PTC
TYPICAL APPLICATION
Telecom terminals have a diode bridge for polarity
guard, located at the line interface stage. They also
have above this diode bridge one crowbar
protection device that is mandatory to prevent
atmospheric effects and AC mains disturbances
from damaging the electronic circuitry that follows
the diode bridge.
SGS-THOMSON proposes a one chip device that
includes both protection and diode bridge. This is
the concept of the T SIxxB1 dev ices.
Fig. 1 : The various uses of the TSIxxB1 in a conventional telecom network
TSIxxB1
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The VRM value corresponds to the maximum
voltage of the application in normal operation. For
instance, if the maximum line voltage is ranging
between ±100V
RMS
of ringing plus 48V of battery
voltage, then the protection chosen for this application shall have a V
RM
close to 200V.
The V
BO
is the triggering voltage. This indicates the
voltage limit for which the component
short-circuits. Passing this V
BO
makes the device
turn on.
The I
BO
is the current that makes the device t urn
on. Indeed, if we want a Trisil to be turned on not
only the voltage across it shall pass the V
BO
value
but the current through it shall also pass the I
BO
value.
In other words, if a voltage surge occurring on the
line is higher than the V
BO
value of a Trisil, whereas
the line surge current is limited to a value that does
not exceed the Trisil’s I
BO
value, then the Trisil will
never turn into short circuit. At this time the surge
will be
clamped by the Trisil.
Anyhow the electronic circuitry located after the
Trisil will always be protected whatever the Trisil
state is (crowbar or clamping mode).
The I
H
stands for the holding current. When the
Trisil is turned on, as soon as the crossing current
surge gets lower than this I
H
value, the Trisil
protection device turns back in its idle state.
Remark : for this r eason the Trisil ’s IH value shall
be chosen higher than what the maximum t elecom
line current can be.
TSIxxB1 BEHAVIOUR WITH REGARD TO
SURGE STANDARD :
The TSIxxB1 is able to replac e both diode bridge
and usual discrete protection on telecom
terminals. Furthermore it complies with the CCITT
K17 recommendations :
10/700 µs waveform surge test, ± 1.5kV
AC power induction test
AC power contact test
ELECTR ICAL PAR AME TERS
Ω
Fig. 2 : Test circuit for the CCITT K17 recommendations
TSIxxB1
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