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TBU-CX050-VTC-WH Datasheet(PDF) 2 Page - Bourns Electronic Solutions |
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TBU-CX050-VTC-WH Datasheet(HTML) 2 Page - Bourns Electronic Solutions |
2 / 5 page Specifications are subject to change without notice. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their specific applications. TBU-CX Series - TBU® High-Speed Protectors Reference Application The TBU® devices are general use protectors used in a wide variety of applications. The maximum voltage rating of the TBU device should never be exceeded. Where necessary, an OVP should be employed to limit the maximum voltage. A cost- effective protection solution combines Bourns® TBU® protection devices with a pair of Bourns® MOVs. For bandwidth sensitive ap- plications, a Bourns® GDT may be substituted for the MOV. See “Trigger Current vs External Resistor Value” graph for selecting the optimum trigger current value using a 0 ohm – 50 ohm resistor value. Note: Line Resistance = TBU® Device Resistance + Rexternal Resistance The TBU® device, constructed using MOSFET semiconductor technology, placed in the system circuit will monitor the current with the MOSFET detection circuit triggering to provide an effective barrier behind which sensitive electronics are not exposed to large voltages or currents during surge events. The TBU® device operates in approximately 1 μs - once line current exceeds the TBU® device’s trigger current Itrigger. When operated, the TBU® device restricts line current to less than 1 mA typically. When operated, the TBU® device will block all voltages including the surge up to rated limits. After the surge, the TBU® device resets when the voltage across the TBU® device falls to the Vreset level. The TBU ® device will automatically reset on lines which have no DC bias or have DC bias below Vreset (such as unpowered signal lines). If the line has a normal DC bias above Vreset, the voltage across the TBU® device may not fall below Vreset after the surge. In such cases, special care needs to be taken to ensure that the TBU® device will reset, with software monitoring as one method used to accomplish this. Bourns application engineers can provide further assistance. Basic TBU Operation Performance Graphs Typical Trigger Current vs. Temperature Equip. OVP OVP Line Line TBU ® Device TBU External Resistor ® Device R External Resistor R Typical V-I Characteristics (TBU-CX050-VTC-WH with Rext = 1 Ω) CURRENT (100 mA/div) VOLTAGE (5 V/div) ITRIP VRESET 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 -75 -50 -25 0 25 50 75 100 125 Junction Temperature (°C) Applications ■ Voice / VDSL cards ■ Protection modules and dongles ■ Process control equipment ■ Test and measurement equipment ■ General electronics |
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