Introduction to SIDACtor® Overvoltage Protection Devices Outline Overvoltage Protection – The race is on – Clamp vs Crowbar Key Parameters – – – – – Vdrm Vbo Vs Holding Current Surge Current Withstand Double Exponential Waveforms Power Cross Considerations Protected Circuit Issues – Let-through voltage – Turn-on time – Capacitance Vbo Dependence Applied voltage dependence Surge Capability dependence Configurations – – – – Single Devices SLIC Devices 2-Chip Devices 3-chip “Y” Devices Package Options Selection Process 2 Version01_100407 The Race is On! Overvoltage Protector Protected Circuit Overvoltage Event 3 Version01_100407 Clamping Devices vs Crowbar Devices Transient Event Vline Clamping Devices Vline Clamp Voltage Crowbar Devices Trigger Voltage Vline Delatch 4 Version01_100407 Outline Overvoltage Protection – The race is on – Clamp vs Crowbar Key Parameters – – – – – Vdrm Vbo Vs Holding Current Surge Current Withstand Double Exponential Waveforms Power Cross Considerations Protected Circuit Issues – Let-through voltage – Turn-on time – Capacitance Vbo Dependence Applied voltage dependence Surge Capability dependence Configurations – – – – Single Devices SLIC Devices 2-Chip Devices 3-chip “Y” Devices Package Options Selection Process 5 Version01_100407 Key Parameters Voltage – Current (V-I) Curve • Voltage is displayed left to right • Current is displayed up and down +I IT IS IH IDRM -V +V VT -I VDRM VBO VS 6 Version01_100407 Key Parameters: VDRM +I IT IS IH IDRM -V +V VT VDRM VBO VS -I 7 Version01_100407 Key Parameters: VBO +I IT IS IH IDRM -V +V VT VDRM VBO VS -I 8 Version01_100407 Key Parameters: VS +I IT IS IH IDRM -V +V VT VDRM VBO VS -I 9 Version01_100407 Key Parameters: Holding Current (Ih) +I IT IS IH IDRM -V +V VT VDRM VBO VS -I 10 Version01_100407 Key Parameters: Surge Current Withstand Double Exponential Waveforms – Simulate induced lightning events – Rise time & decay time in microseconds Transients Transients Underground Line 10 x 1000 10 x 700 8 x 20 10 x 560 2 x 10 5 x 320 11 Version01_100407 Key Parameters: Power Cross Events Accidental contact with power lines • Construction Accidents • Traffic Accidents • Weather-related Accidents Inductive coupling • Co-locating telephone cables with power cables • Improper grounding 12 Version01_100407 Outline Overvoltage Protection – The race is on – Clamp vs Crowbar Key Parameters – – – – – Vdrm Vbo Vs Holding Current Surge Current Withstand Double Exponential Waveforms Power Cross Considerations Protected Circuit Issues – Let-through voltage – Turn-on time – Capacitance Vbo Dependence Applied voltage dependence Surge Capability dependence Configurations – – – – Single Devices SLIC Devices 2-Chip Devices 3-chip “Y” Devices Package Options Selection Process 13 Version01_100407 Protected Circuit Issues: Let-Through Voltage Let-through voltage: The peak voltage that the protected circuit will see in the real application. Similar to the datasheet Vs value: – Vs is defined as the peak voltage measured directly across the SIDACtor at a particular voltage rate of rise. Dependent on: – Actual incident voltage rate of rise – Board layout: SIDACtor should be as near the entrance to the board as possible. SIDACtor should be “in-line” so that the surge must pass under the SIDACtor on the way to the protected circuit.. 14 Version01_100407 Protected Circuit Issues: Turn-On Time Turn-On Time – Time to clamp – Time to crowbar – Clamp to crowbar transition time 15 Version01_100407 Protected Circuit Issues: Capacitance Vbo Dependence 80 pF 70 60 50 Capacitance vs Vbo (C-rated "MC" SIDACtor, 2V Bias) 40 30 20 10 0 0 100 200 Vbo 300 400 16 Version01_100407 Protected Circuit Issues: Capacitance Applied Voltage Dependence 60 Capacitance vs Applied Voltage (P2600SCMC) 50 pF 40 30 20 10 0 0 10 20 30 40 50 60 Applied Voltage 17 Version01_100407 Protected Circuit Issues: Capacitance Surge Capability Dependence P2300xx A B C D RE ME Surge Rating (8x20) 150 250 400 1000 3000 5000 Capacitance (pF @ 2V) 30 38 55 65 220 475 18 Version01_100407 Outline Overvoltage Protection – The race is on – Clamp vs Crowbar Key Parameters – – – – – Vdrm Vbo Vs Holding Current Surge Current Withstand Double Exponential Waveforms Power Cross Considerations Protected Circuit Issues – Let-through voltage – Turn-on time – Capacitance Vbo Dependence Applied voltage dependence Surge Capability dependence Configurations – – – – Single Devices SLIC Devices 2-Chip Devices 3-chip “Y” Devices Package Options Selection Process 19 Version01_100407 SIDACtor Device Configurations: Standard Single Devices The Original Flexible Board Layout 20 Version01_100407 SIDACtor Device Configurations: SLIC Single Devices SIDACtor Device for Negative Voltages Diode Device for Positive Voltages Subscriber Line Interface Circuit 21 Version01_100407 SIDACtor Device Configurations: 2-Chip Devices TwinChip 2-in-1 Packaging Matched Chips TwinSLIC 2-in-1 Packaging 1 pkg per port Broadband Optimized Half the capacitance Better linearity 22 Version01_100407 SIDACtor Device Configurations: 3-Chip “Y” Devices Lower Capacitance Better Capacitance Balance Better Voltage Balance Better Surge Balance 3-for-1 Placement Advantage 23 Version01_100407 SIDACtor Device Configurations: Tracking Devices BATTRAX Trademark Sophisticated SLIC protection Retains diodes for positive surges Negative breakdown voltage determined by reference Positive voltage tracking also available 24 Version01_100407 SIDACtor Device Configurations: Bridge Devices For Broadband Applications – And more! Patented Bridge Design Low Capacitance Great Capacitance Balance Perfect Voltage Balance Perfect Surge Balance Biasing provides flat lower and flatter capacitance 25 Version01_100407 Outline Overvoltage Protection – The race is on – Clamp vs Crowbar Key Parameters – – – – – Vdrm Vbo Vs Holding Current Surge Current Withstand Double Exponential Waveforms Power Cross Considerations Protected Circuit Issues – Let-through voltage – Turn-on time – Capacitance Vbo Dependence Applied voltage dependence Surge Capability dependence Configurations – – – – Single Devices SLIC Devices 2-Chip Devices 3-chip “Y” Devices Package Options Selection Process 26 Version01_100407 SIDACtor Part Numbering A: ITU K.20 & K.21 B: TIA-968-A C: GR-1089 27 Version01_100407 Package Options: Thru-Hole G E TO-218 M R A 28 Version01_100407 Package Options: Surface Mount 3x3 QFN C S Q12 3.3x3.3 QFN Q22 U Q38 5x6 QFN N 29 Version01_100407 Outline Overvoltage Protection – The race is on – Clamp vs Crowbar Key Parameters – – – – – Vdrm Vbo Vs Holding Current Surge Current Withstand Double Exponential Waveforms Power Cross Considerations Protected Circuit Issues – Let-through voltage – Turn-on time – Capacitance Vbo Dependence Applied voltage dependence Surge Capability dependence Configurations – – – – Single Devices SLIC Devices 2-Chip Devices 3-chip “Y” Devices Package Options Selection Process 30 Version01_100407 Selection Methods Datasheet Parameters – – – – Vdrm, Vbo, Vs Ih Surge Current Withstand Capacitance & Linearity Configuration Selection Package Selection Normal System Voltages SIDACtor Protection Range +I System Damage Voltages IT IS IH IDRM -V +V VT -I VDRM V S 31 Version01_100407 Thank You! 32 Version01_100407