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TBU-PL060-200-WH Datasheet(PDF) 2 Page - Bourns Electronic Solutions |
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TBU-PL060-200-WH Datasheet(HTML) 2 Page - Bourns Electronic Solutions |
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2 / 7 page  Specificationsaresubjecttochangewithoutnotice. Thedevicecharacteristicsandparametersinthisdatasheetcananddovaryindifferentapplicationsandactualdeviceperformancemayvaryovertime. Usersshouldverifyactualdeviceperformanceintheirspecificapplications. TBU-PL Series - TBU® High-Speed Protectors Functional Block Diagram Reference Application The TBU-PL Series are high-speed protectors used in voice/ VoIP SLIC applications.The maximum voltage rating of the TBU® device should never be exceeded. Where necessary, an OVP device 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 applications, a Bourns® GDT may be substituted for the MOV. If EN55024 EMC compliance is required, the TBU® device may require capacitors to be fitted between the Tip and Ring connections and ground. MOV MOV TBU® Device GND -VBAT Line 1 SLIC Vdd Vss Line 2 SLIC Line 1 Line 2 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 operat- ed, the TBU® device will limit the current to less than the Itrigger value within the tblock duration. If voltage above Vreset is contin- uously sustained, the TBU® device will subsequently reduce the current to a quiescent current level within a period of time that is dependent upon the applied voltage. When the voltage on the SLIC output is driven below (Vbat – Vto) the TBU-PL series device switches to the blocking state, regardless of output current in the device. 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 Line 1 HIGH VOLTAGE SWITCH Line 1 SLIC Vss Line 2 Line 2 SLIC CURRENT SENSE + VOLTAGE COMPARATOR HIGH VOLTAGE SWITCH CURRENT SENSE + VOLTAGE COMPARATOR Vss Vdd Vss Vdd Vdd |
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