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Introduction to SDP / SEP SIDACtor Overvoltage Protection Devices Outline SDP / SEP Protectors – – – – – High Surge Capability Breakthrough Package Size Low Capacitance Capacitance Independent of Line Voltage Perfect Balance Bridge Transformer Coupled Apps – – – – SDP vs GDT Notes on Biasing Notes on the QFN Package Demo PCBs Available 2 2 Version01_100407 High Surge Capability Surge Regulatory Requirement (without external resistance) Voice, ISDN, T1/E1, T3, ADSL, VDSL Ethernet Power Over Ethernet SDPxxx0Q38CB (8V-350V) SEPxxx0Q38CB (8V -90V) SDPxxx0Q38B (64V-350V) All SDP / SEP Devices are RoHS Compliant and UL recognized. GR-1089 Interbuilding ITU K.20/K.21 Enhanced (500A 2x10) ITU K.20/K.21 Basic (100A 10x560) (File# E133083) SDP: Semiconductor DSL Protector SEP: Semiconductor Ethernet Protector 3 3 Version01_100407 Breakthrough Package Size Tip & Ring Protection in one package 5 x 6 x 1.5mm Surface Mount Package Standard SO-8 Footprint Feed-thru PCB Layout Package Size Comparison SDP / SEP 4 4 Version01_100407 Broadband Overview • Broadband encompasses many technologies and protocols. • For this module we will be focusing on the xDSL technololgies. • xDSL uses complex coding schemes to pack more data into less bandwidth. POTS POTS ADSL T1 T1 E1 E1 ADSL2+ ADSL2+ ADSL2++ ADSL2++ 10BaseT 10BaseT VDSL VDSL VDSL2 VDSL2 T3 T3 100BaseT 100BaseT 0 20 40 60 Mhz 80 Data Rates ADSL Spectra 100 120 140 0 50 100 150 200 Mbps/Pair 5 5 Version01_100407 Low Capacitance High Capacitance will rob power from the signal. Capacitance gains in importance as the data rate of the signal increases. – Non-Issue for Voice, T1/E1 – Minor Issue for T3, ADSL – Major Issue for VDSL, Ethernet SDP & SEP devices have capacitance values that are low enough to preserve signal power. Typical Capacitance Values (Zero Line Voltage) SDPxxx0Q38CB VBIAS = 50V SDPxxx0Q38B SEPxxx0Q38CB VBIAS = 5V 11 pF 23 pF 20 pF SP03-3.3 9 pF P0080SCMC 73 pF P0640SCMC 93 pF P1800SCMC 57 pF P3100SCMC 50 pF GDT <1 pF 6 6 Version01_100407 Constant Capacitance / Changing Voltage Error-Free Broadband Requires Unchanging Capacitance As Line Voltage Varies Changing Capacitance Causes Data Errors Constant Capacitance Becomes More Critical as Data Rates Increase Only the Patented Circuit of the SDP / SEP Can Offer Constant Capacitance in a Semiconductor Protector. (US Patent #7515391) SIDACtor Capacitance vs Line Voltage 100 90 P0080SAMC P0300SAMC 70 P0300SCMC P0640SCMC pF 60 P2600SCMC P3100SCMC 50 P3100D 40 P3500SCMC 30 20 10 Increasing Bias Voltage P0080SCMC 80 0 0.1 1 Line Voltage 10 100 Ideal Constant Capacitance 7 7 Version01_100407 A Perfectly Balanced Bridge One Robust SIDACtor Device – One VS (T-R, T-G, R-G) Optimal Capacitance Balance to Ground Minimal Longitudinal Conversion Loss No Conversion of Common-Mode Events to Differential Mode 8 8 Version01_100407 Transformer Coupled Applications No Conversion of Common-Mode Events to Differential Mode 300V R DSL Chipset 2-Element Solution 310V R 150V OVP Switches Close when VBO is present. R 3-Element Solution DSL Chipset 150V 160V R SDP/ SEP Solution While shown for DSL here, this perfectly balance bridge advantage is useful in any transformer coupled application. R DSL Chipset 300V R 9 9 Version01_100407 SDP vs GDT Before Comparison SDP / SEP GDT Acceptable Capacitance Yes Yes Constant Capacitance Yes Yes AC Power Cross Dissipation Very Low Very High After Low (< 75V) Breakover Voltages Available Yes No Voltage Overshoot Very Low Very High Board Space Req’d Minimal Substantial Backside PCB Mount Yes Not Likely 10 10 Version01_100407 Seven SDP / SEP Biasing Rules 1. 2. 3. 4. 5. 6. The bias voltage MUST be less than the SDP / SEP standoff voltage. (Vbias < Vdrm) The bias supply may be ground referenced. The bias supply may “float” with respect to ground. The higher the bias supply voltage, the better the performance of the SDP / SEP. Just watch out for Rule #1… We recommend 1 MΩ resistors for most applications. The bias supply isolation resistors must be voltage rated to VS to avoid flash-over during a surge event. (Usually 1206 for SDP or 0805 for SEP) 7. Several devices can share bias resistors. Bias supply current will be < 5µA if these rules are followed. 11 11 Version01_100407 FAQ: Will My CM Have Trouble Mounting Your QFN Package?? Not Likely! While some CM’s have had issues with other QFN packages, those concerns are usually associated with a central ground pad in the center of the package. Our QFN package does not utilize such a pad. Littelfuse QFN Non-Littelfuse QFN w/ pad 12 12 Version01_100407 SDP / SEP Demo PCB SDP Demo PCB – – – – – – Four RJ11 Channels Variety of SDP’s Can be Specified One Reference Channel On-board 3 – 35V Bias Supply External Bias Option Enhanced TeleLink Fuses SEP Demo PCB – – – – – – One 4-Pair Ethernet Channel Variety of SEP’s Can be Specified One Reference Channel On-board 3-35V Bias Supply External Bias Option Enhanced TeleLink Fuses 13 13 Version01_100407 SDP / SEP SIDACtor Overvoltage Protection Devices Thank You! 14 14 Version01_100407