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PDF TC04A-200 Data sheet ( Hoja de datos )
| Número de pieza | TC04A-200 | |
| Descripción | Battery Tracking TransClamp For SLIC Linecard Protection | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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PROTECTION PRODUCTS
Description
The battery tracking TransClamp series of transient
voltage suppressors (TVS) are designed to protect
subscriber line interface circuit (SLIC) from transient
voltages resulting from lightning strikes and AC power
line disturbances. The TC04A-200 integrates all the
components necessary to protect SLIC ICs from line to
ground for positive and negative transients.
For negative transient events, the TVS thyristor will
crowbar or fire when the line voltage exceeds the
gate reference voltage. The gate voltage is referenced
to the battery voltage ( -VBAT ) plus the VF of the series
rectifier. The device firing voltage range is -5V to
-100V. For positive transients, the surge-rated rectifi-
ers will be forward biased, shunting the current to
ground. An external capacitor is used to aid in gate
triggering during fast rise time transients.
The device may be used to protect any SLIC including
those with integrated ring generators.
These devices are designed to meet industry standard
transient immunity requirements such as Bellcore TR-
NWT-001089, FCC Part 68, ITU K17-K20, and IEC
61000-4-5. The integrated design saves board space
and increases equipment reliability by replacing mul-
tiple discrete components.
TC04A-200
Battery Tracking TransClamp
For SLIC Linecard Protection
PRELIMINARY
Features
u Transient protection for telecommunications lines to
Bellcore 1089 (long haul), VDE 0433, ITU K20
IEC 61000-4-5 (Lightning), and FCC Part 68
u High surge current rating (100A, tp = 10/1000µs)
u Protects up to four Tip & Ring line pairs
u Gate firing voltage is referenced to the system
battery voltage
u Wide firing voltage range: -5V to -100V
u High holding current: 200mA
u Replaces multiple discrete components
u Solid-state TVS process technology
Mechanical Characteristics
u JEDEC SO-16 WB package
u Molding compound flammability rating:
UL 94V-0
u Marking : Part number, date code, logo
u Packaging : Tube or Tape and Reel per EIA 481
Applications
u Subscriber Line Interface Circuit (SLIC) Protection
u Central Office Equipment
u ISDN Terminal Adaptors
u Cable Telephony
u Small Office Home Office (SOHO) Applications
u Wireless Local Loop (WLL)
u Fibre In The Loop (FITL)
Circuit Diagram (Each Line)
Schematic & PIN Configuration
Line
Line
-VBat
Revision 9/2000
GND
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
SO-16 WB Top View
1 www.semtech.com
1 page  
TC04A-200
PROTECTION PRODUCTS
Applications Information (continued)
Operation of Battery Tracking TransClamp
Telecommunications lines are vulnerable to transient
disturbances from a variety of sources. Disturbances
strike the line or near it and are then propagated to
the extremities of the lines where sensitive electronics
are located. The TransClamp series of thyristor surge
suppressors are designed to protect sensitive telecom-
munications equipment from transient voltages result-
ing from lightning strikes and AC power line distur-
bances.
The TC04A-200 utilizes internal diodes connected from
each line to ground provide protection from positive
overvoltages. During a positive duration transient,
these internal diodes are forward biased shunting the
transient current to ground. The voltage seen by the
protected IC will be the forward clamping voltage (VCF)
of the diode. A gated TVS thyristor provides protection
against negative surges. When the voltage on the Tip
or Ring line falls below the reference voltage at the
gate, the triggering diode begins to conduct forcing the
TVS thyristor to crowbar (turn-on) to a low on-state
voltage. The current required to trigger the thyristor is
defined as the switching current (IS). The maximum
voltage seen by the protected IC will be the switching
voltage (VS). Once the transient subsides, the device
will return to a high impedance (off-state) when the line
current falls below the holding current (IH). The high
holding current of the TC04 prevents d.c. latch-up
because the holding current is higher than the SLIC
can source.
Protecting One SLIC Line Pair
The TC04A-200 battery tracking TransClamp is specifi-
cally designed to protect subscriber line interface
circuits (SLICs). The protection voltage of the device is
referenced to the systems DC battery voltage. There-
fore, the protection voltage will be essentially the same
as the SLIC supply voltage, minimizing the stress on
the protected device. The TC04A-200 may be refer-
enced to battery voltages ranging from -5V to -100V.
Pins 1-4 are connected to Tip line or A-lead and pins
13-16 are connected to the Ring line or B-lead. The
battery feed voltage source is connected to the gate of
the internal SCRs at pins 6 & 11. Pins 7-10 are
connected to ground. All ground pins should be con-
nected for best results. A 0.1µF capacitor is recom-
mended between the gate & ground to speed up the
triggering of the device.
ã 2000 Semtech Corp.
5
TC04 Connection Diagram
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
TC04 IV Characteristic Curve
Symbol
VDRM
VS
VT
VC
VF
VCF
IDRM
IS
IT
IH
IPP
Parameter
Reverse Stand-Off (Off-State) Voltage
Switching Voltage
On-State Voltage
Reverse Clamping Voltage
Diode forward Voltage
Forward Clamping Voltage
Reverse leakage (Off-State) Current
Switching Current (Gate Triggering Current)
On-State Current (Continuous)
Holding Current
Peak Impulse Current
www.semtech.com
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TC04A-200.PDF ] | |
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