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® 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 µs without a primary protector. Solution 1 TBU® High-Speed Protector: TBU-PL085-200-WH 2 MOV Devices: MOV-10D391K MOV-10D391K Alternate Recommendations Other PortNote® 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® High-Speed Protector for normal operation. All other SLICs may use 100 mA Itrigger TBU® HSP devices. Americas: Tel +1-951 781-5500 Fax +1-951 781-5700 Europe: Tel +41-(0)41 768 55 55 Asia-Pacific: Tel +886-2 256 241 17 Fax +41-(0)41 768 55 10 Fax +886-2 256 241 16 COPYRIGHT© 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. REV 10/12 Bourns® PortNote® solutions provide protection recommendations for typical port threats. For more information, go to: www.bourns.com or email: [email protected]