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| Battery Tracking TransClamp For SLIC Linecard Protection 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 rectifiers 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 TRNWT-001089, FCC Part 68, ITU K17-K20, and IEC 61000-4-5. The integrated design saves board space and increases equipment reliability by replacing multiple discrete components. TC04A-200 PRELIMINARY Features u Transient protection for telecommunications lines to u u u u u u u 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 four 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 multiple discrete components 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 u u u u u u Subscriber Line Interface Circuit (SLIC) Protection Central Office Equipment ISDN Terminal Adaptors Cable Telephony Small Office Home Office (SOHO) Applications Wireless Local Loop (WLL) Fibre In The Loop (FITL) Circuit Diagram (Each Line) Schematic & PIN Configuration 1 16 Line Line 2 15 3 14 4 13 -VBat 5 12 6 11 7 10 8 9 GND SO-16 WB Top View Revision 9/2000 1 www.semtech.com TC04A-200 PROTECTION PRODUCTS Absolute Maximum Rating R ating Peak Pulse Current (tp = 10/1000ms) Peak Pulse Current (tp = 2/10ms) Continuous 60Hz Sinew ave Lead Soldering Temp erature Op erating Temp erature Storage Temp erature Symbo l I PP I PP ITSM TL TJ TSTG Value 100 500 60 260 (10 seconds) -55 to +125 -55 to +150 Units A A A o C C C o o Electrical Characteristics TC04A-200 Par ame te r Reverse Stand -Off Voltage Sw itch ing Voltage Reverse Clamp ing Voltage Symbo l VDRM VS VC Co nd itio ns T=25C I = IS IPP = 1A , tp = 10/1000 s IPP = 30A , tp = 10/1000 s IPP = 100A , tp = 10/1000 s Diod e Forw ard Clamp ing Voltage V CF IPP = 1A , tp = 10/1000 s IPP = 30A , tp = 10/1000 s IPP = 100A , tp = 10/1000 s On-State Voltage Reverse Leakage Current Sw itch ing Current (Gate Triggering Current) Hold ing Current Continuous On-State Current Off-State Cap acitance VT IDRM IS IH IT COFF IT = 1A V DRM = -100V, T=25C T=25C T=25C T=25C Betw een I/O p ins & Gnd V R = 0V, f = 1MHz Betw een I/O p ins &Gnd V R = -50V, f = 1MHz a 2000 Semtech Corp. 2 Minimum Typ ical Maximum -100 Units V V -V BATT-5V 2 3 12 1.2 2.5 4.2 2 3 5.5 3 5 60 -200 -240 1 100 50 V V V V V V V A mA mA A pF pF www.semtech.com TC04A-200 PROTECTION PRODUCTS Typical Characteristics Impulse Derating Curve 110 100 90 % of Rated Power or I PP 80 70 60 50 40 30 20 10 0 0 25 50 75 100 o Normalized Holding Current vs. Temperature 1.4 1.2 Normalised Holding Current 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 Current 1 0.8 0.6 0.4 0.2 0 Reverse Leakage Current - IDRM (uA) 100 VDRM=-100V 10 1 0.1 0 25 50 75 100 125 150 0 20 40 60 80 100 120 140 Temperature (oC) 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 - V F (V) 4 3 Volts -5 -15 -25 -35 -50V Bias -45 -60V Bias -70V Bias -80V Bias -90V Bias 2 1 0 0 20 40 60 80 100 120 140 160 -55 -65 -75 -85 -95 Tim e in uSec Forward Current - IF (A) a 2000 Semtech Corp. 3 www.semtech.com TC04A-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. SLIC Operating Voltages (Unbalanced Ringing) Balanced Ringing 0V Tip Battery Ring Protecting SLIC with Integrated Ring Generator a 2000 Semtech Corp. 4 www.semtech.com 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 telecommunications equipment from transient voltages resulting from lightning strikes and AC power line disturbances. 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 specifically designed to protect subscriber line interface circuits (SLICs). The protection voltage of the device is referenced to the systems 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 TC04A-200 may be referenced 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 connected for best results. A 0.1F capacitor is recommended between the gate & ground to speed up the triggering of the device. a 2000 Semtech Corp. 5 TC04 Connection Diagram 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 TC04 IV Characteristic Curve Symb ol VDRM VS VT VC VF V CF IDRM IS IT IH I PP Parameter Reverse Stand -Off (Off-State) Voltage Sw itch ing Voltage On-State Voltage Reverse Clamp ing Voltage Diod e forw ard Voltage Forw ard Clamp ing Voltage Reverse leakage (Off-State) Current Sw itch ing Current (Gate Triggering Current) On-State Current (Continuous) Hold ing Current Peak Imp ulse Current www.semtech.com TC04A-200 PROTECTION PRODUCTS Typical Applications Protecting Multiple SLIC Lines The TC04A-200 may be used in conjunction with steering diodes to protect up to four SLIC Tip & Ring line pairs. The steering diodes shunt positive surges to ground. The internal diodes of the TC04A-200 may be used as one of the steering diode pairs as shown. In this configuration, each line pair may be suged to 100A (tp=10/100s) independantly, or all four pairs may be surged simultaneously up to 25A (tp=10/100s). This provides the designer with a flexible, cost effective solution and increased reliability over low current protection schemes. The surge immunity of the system may be further enhanced with the addition of line feed resistors (LFR). These devices are used for power cross protection and are designed to withstand lightning impulses per Bellcore GR-1089. Device with resistance values ranging from of 10W - 50W are common. A 0.1F capacitor is recommended between the gate & ground to speed up the triggering the device. Note that the sum of the loop currents must not exceed the holding current of the TC04A-200. In the case of four twisted pairs, the individual loop currents would have to be limited to 50mA. Comp onent T VS Steering Diod es LFR Par t N umb er TC04A -200 ES1D A LFR-2 Source Semtech GSI IR C Descrip tion Battery Tracking TransClamp Ultrafast Sur face Mount Rectifier Telecommunications Line Feed Resistor a 2000 Semtech Corp. 6 www.semtech.com TC04A-200 PROTECTION PRODUCTS Outline Drawing - SO-16 WB 2 2 .415 3 Note 1: Controlling dimension : Inch (unless other wise specified). Note 2: Dimensions A and B do not include mold protrusions. Mold protrusions are .006" max. Note 3: Dimensions apply before solder dip on parts requiring solder dip. 3 Land Pattern - SO-16 WB Note 1 : Controlling dimension is millimeters Note 2 : Grid placement courtyard is 22 x 24 elements (11mm x 12mm) in accordance with the international grid detailed in IEC publication 97. a 2000 Semtech Corp. 7 www.semtech.com TC04A-200 PROTECTION PRODUCTS Ordering Information Par t Numbe r TC04A -200.TD Ho ld ing Cur r e nt 200mA Qty p e r R e e l 1,000 R e e l Size 13 Inch Note: (1) No suffix indicates tube pack. Contact Information Semtech Corporation Protection Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804 a 2000 Semtech Corp. 8 www.semtech.com |
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