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TBU-DT085-200-WH Datasheet(PDF) 2 Page - Bourns Electronic Solutions |
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TBU-DT085-200-WH Datasheet(HTML) 2 Page - Bourns Electronic Solutions |
2 / 5 page Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. TBU-DT Series - TBU® High Speed Protectors Reference Application The TBU® device can be used to protect against excessive voltage surges in transformer coupled equipment, as shown in the figure below. The TBU® protector prevents any surges from causing damage. An overvoltage protection device, such as an MOV or GDT, may be used to provide additional overvoltage protection if the surge voltage is likely to be above the maximum rating of the TBU® device. The TBU® device is a silicon-based, solid-state, resettable device which is placed in series with a signal path. The TBU® device operates in approximately 1 µs - once line current exceeds the TBU® device’s trigger current Itrigger. When oper- ated, the TBU® device restricts line current to less than 1 mA typically. When operated, the TBU® device will block all system voltages and any other 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 ® de- vice 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, otherwise an automatic or manual power down will be required. Bourns application engineers can provide further assistance. Basic TBU Operation Performance Graphs V-I Characteristic - TBU-DT085-300-WH (Pin 2-1 & Pin 3-4) Typical Trigger Current vs. Temperature Load OVP OVP TBU® Device Line Side 12 43 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -75 -50 -25 0 25 50 75 100 125 150 Junction Temperature (°C) CURRENT (100 mA/div.) VOLTAGE (5 v/div.) VRESET ITRIP |
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