Negative Battery Voltage SLIC Protection ITU-T Solution Solution Products TBU-PL085-200-WH Objective Compliance The SLIC (Subscriber Line Interface Circuit) provides all the BORSCHT functions such as battery, ringing and supervision between the codec and telephone hand set. This PortNote(R) solution discusses negative battery voltage solutions against surge and power contact threats. ITU-T Basic K.20, K.21, K.45. * 230 Vrms, 23 A, 900 seconds withstand. * 600 Vrms, 1 A, 0.2 seconds withstand. * Increased surge withstand to 4 kV 10/700 s without a primary protector. Solution 1 TBU(R) High-Speed Protector: TBU-PL085-200-WH 2 MOV Devices: MOV-10D391K MOV-10D391K Alternate Recommendations Other PortNote(R) Solutions: * Dual Supply Voltage SLIC Protection - ITU-T Solution * Negative Battery Voltage SLIC Protection - GR-1089-CORE Intra-building Solution * SLIC Protection - GR-1089-CORE Intra-building Solution Benefit This solution provides a high level of protection in a small PCB area. GND VDD SLICTip Tip MOV-10D391K SLIC RJ11 TBU-PL085-200-WH* MOV-10D391K Design Kit SLICRing Ring VSS -VBAT The schematic above illustrates the application protection and does not constitute the complete circuit design. Customers should verify actual device performance in their specific applications. PN-DESIGNKIT-42 *Note: The VE950 series (e.g. Le9500, Le9520, Le9530, Le9540) require a 200 mA Itrigger TBU(R) High-Speed Protector for normal operation. All other SLICs may use 100 mA Itrigger TBU(R) HSP devices. Americas: Europe: Tel +41-(0)41 768 55 55 Fax +41-(0)41 768 55 10 Asia-Pacific: REV 10/12 Tel +1-951 781-5500 Fax +1-951 781-5700 Bourns(R) PortNote(R) solutions provide protection recommendations for typical port threats. Tel +886-2 256 241 17 Fax +886-2 256 241 16 For more information, go to: COPYRIGHT(c) 2012 * BOURNS, INC. * 10/12 * e/CPK1235 * "PortNote" is a registered service mark of Bourns, Inc. "Bourns" and "TBU" are registered trademarks of Bourns, Inc. in the U.S. and other countries. www.bourns.com or email: protection@bourns.com Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Bourns: PN-DESIGNKIT-38 PN-DESIGNKIT-42