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| TM Battery Tracking TransClampTM For SLIC Linecard Protection PROTECTION PRODUCTS Description The battery tracking TransClamp series of transient voltage suppressors (TVS) are designed to protect subscriber line interface circuits (SLIC) from transient voltages resulting from lightning strikes and AC power line disturbances. The TC03A-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. External diodes are used to shunt positive transients to ground. These devices are designed to meet industry standard transient immunity requirements such as Bellcore TRNWT-001089, FCC Part 68, ITU K17-K20, and IEC 61000-4-5. The high surge capability is advantageous in harsh environments, and offers better reliability than "low surge" rated devices. The integrated design saves board space and increases equipment reliability by replacing multiple discrete components. The device may be used to protect any SLIC and is particularly suited for those with integrated ring generators. TC03A-200 PRELIMINARY Features ! Transient protection for telecommunications lines to ! ! ! ! ! ! ! Bellcore 1089 (long haul), VDE 0433, ITU K20 IEC 61000-4-5 (Lightning), and FCC Part 68 High surge current rating (100A, tp = 10/1000s) Protects up to two Tip & Ring line pairs Gate firing voltage is referenced to the system battery voltage Wide firing voltage range: -5V to -100V High holding current: 200mA Replaces discrete components Solid-state TVS process technology Mechanical Characteristics ! JEDEC SOT-89 package ! Molding compound flammability rating: UL 94V-0 ! Marking : Part number, date code, logo ! Packaging : Tape and Reel per EIA 481 Applications ! ! ! ! ! ! Subscriber Line Interface Circuit (SLIC) Protection Central Office Equipment ISDN Terminal Adaptors Cable Telephony Small Office Home Office (SOHO) Applications Wireless Local Loop (WLL) Circuit Diagram Schematic & PIN Configuration Line -VBat 1 3 2 GND 1 LINE 2 GND 3 GATE SOT-89 (Top View) Revision 9/2000 1 www.semtech.com TCO3A-200 PROTECTION PRODUCTS Absolute Maximum Rating Rating Peak Pulse Current (tp = 10/1000s) Peak Pulse Current (tp = 2/10s) Continuous 60Hz Sinewave Lead Soldering Temperature Operating Temperature Storage Temperature Symbol IP P IP P ITSM TL TJ TSTG Value 100 500 60 260 (10 seconds) -55 to +125 -55 to +150 PRELIMINARY PRELIMINARY U n i ts A A A o C C C o o Electrical Characteristics TC03A-200 Parameter Reverse Stand-Off Voltage Switching Voltage Reverse Clamping Voltage Symbol VDRM VS VC Conditions T=25C I = IS IPP = 1A, tp = 10/1000s IPP = 30A, tp = 10/1000s IPP = 100A, tp = 10/1000s On-State Voltage Reverse Leakage Current Switching Current (Gate Triggering Current) Holding Current Continuous On-State Current Off-State Capacitance VT IDRM IS IH IT COFF IT = 1A VDRM = -100V, T=25C T=25C T=25C T=25C Between I/O pins & Gnd VR = 0V, f = 1MHz Between I/O pins &Gnd VR = -50V, f = 1MHz 100 50 -200 60 -220 1 -VBATT-5V 2 3 12 3 5 Minimum Typical Maximum -100 Units V V V V V V A mA mA A pF pF 2000 Semtech Corp. 2 www.semtech.com TCO3A-200 PROTECTION PRODUCTS Typical Characteristics Impulse Derating Curve 110 100 90 % of Rated Power or IPP 80 70 60 50 40 30 20 10 0 0 25 50 75 100 o PRELIMINARY PRELIMINARY Normalized Holding Current vs. Temperature 1.4 Normalised Holding Current 1.2 IH (TJ)/IH (25 C) 1 0.8 0.6 0.4 0.2 0 o 125 150 0 25 50 75 100 125 150 Ambient Temperature - TA ( C) Junction temperature - TJ (oC) Reverse Leakage Current vs. temperature 1000 Normalized Gate Trigger Current vs. temperature 1.2 Normalised Gate Trigger Curren 1 0.8 0.6 0.4 0.2 0 Reverse Leakage Current - DRM (uA) I 100 VDRM=-100V 10 1 0.1 0 25 50 75 100 125 150 0 20 40 60 80 100 120 140 Temperature (o C) Temperature (oC) Diode Forward Voltage vs. Forward Current 6 2.5 3.5 Impulse Response Characteristic 1.2x50uSec 920V@50A w ith 0.1uFd 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5 5 Forward Voltage - VF (V) 4 3 Volts -5 -15 -25 -35 -50V B ias -45 -60V B ias -70V B ias -80V B ias -55 -90V B ias 2 1 0 0 20 40 60 80 100 120 140 160 -65 -75 -85 -95 Time in uS ec Forward Current - IF (A) 2000 Semtech Corp. 3 www.semtech.com TCO3A-200 PROTECTION PRODUCTS Applications Information SLIC protection Concepts Transient immunity standards require telecommunications equipment be surged in all of its operating states. This refers to the "on-hook" state (ring generator or ring detection monitoring) and the "off-hook" state (operational state). The On-Hook state must allow for operation of the normal battery voltage and ring voltage without interference. The Off-Hook state only allows for operation of the battery voltage plus operation signals. Several SLIC types exist. The first type of SLIC requires an external ring relay to disconnect the SLIC and connect the ringing and trip bias power supply generating the ringing signal. Protection must be provided for the subsystem which includes the ringing relay and ringing source. This type of ringing is sometimes called unbalanced ringing. The ringing voltage is typically inserted on the Ring (B-lead), while the Tip (A-lead) is grounded. The SLIC may or may not be protected by the ringing subsystem protection. Separate subsystem protection may be needed and must have a minimum operating voltage that exceeds the battery voltage and the ring signal voltage. The SLIC IC is disconnected from the line and the ring generator and does not see the ringing voltages. Therefore, the protection element for the SLIC must only have a minimum operating voltage greater than the battery supply voltage. This device must suppress all transients above ground and below the battery voltage. The second SLIC type has an integrated ring generation capability. The protection device described in this application information is particularly suited for use with this SLIC type. Unlike the unbalanced system described above, these SLIC devices generate a balanced ring signal between Tip & Ring. The voltage on either line falls between the battery voltage and ground. Therefore, the SLIC protection device can have an operating voltage that is very close to the battery voltage. Since battery voltages may vary between talk and ringing states, it is desirable to utilize a programmable protection device so that the voltage across the SLIC does not exceed the process limits and the stress on the device is minimized. PRELIMINARY PRELIMINARY SLIC Operating Voltages (Unbalanced Ringing) Balanced Ringing 0V Tip Battery Ring 2000 Semtech Corp. 4 www.semtech.com TCO3A-200 PROTECTION PRODUCTS Applications Information (continued) Protecting One SLIC Line Pair The TC03A-200 battery tracking TransClamp is specifically designed to protect subscriber line interface circuits (SLICs). The protection voltage of the device is referenced to the system's DC battery voltage. Therefore, the protection voltage will be essentially the same as the SLIC supply voltage, minimizing the stress on the protected device. The TC03A-200 may be referenced to battery voltages ranging from -5V to -100V. Pin 1 is connected to the line (A-lead or B-lead). The battery feed voltage source is connected to the gate of the internal SCR at pin 3. Pin 2 is connected to ground. A 0.1F capacitor is recommended between the gate & ground to speed up the triggering of the device. Protecting Multiple SLIC Lines The TC03A-200 may be used in conjunction with steering diodes to protect up to two SLIC Tip & Ring line pairs. The steering diodes shunt positive surges to ground. In this configuration, each line pair may be surged to 100A (tp=10/100s) independantly, or all four pairs may be surged simultaneously up to 50A (tp=10/100s). This provides the designer with a flexible, cost effective solution and increased reliability over low current protection schemes. PRELIMINARY PRELIMINARY TC03 Connection Diagram 1 LINE 2 GND 3 GATE Typical Applications TC03A-200 TC03A-200 Protecting SLIC with Integrated Ring Generator 2000 Semtech Corp. 5 www.semtech.com TCO3A-200 PROTECTION PRODUCTS Typical Applications (continued) PRELIMINARY PRELIMINARY Protecting SLIC with External Ring Generator Protecting Multiple SLIC's with External Ring Generators 2000 Semtech Corp. 6 www.semtech.com TCO3A-200 PROTECTION PRODUCTS Outline Drawing - SOT-89 PRELIMINARY PRELIMINARY Land Pattern - SOT-89 2000 Semtech Corp. 7 www.semtech.com TCO3A-200 PROTECTION PRODUCTS Ordering Information Part Number TC03A-200.TC Holding Current 200mA Qty per R eel 3000 R eel Size 7 Inch PRELIMINARY PRELIMINARY Contact Information Semtech Corporation Protection Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804 www.semtech.com 2000 Semtech Corp. 8 |
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