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TBU-PK085-100-WH Datasheet(PDF) 2 Page - Bourns Electronic Solutions |
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TBU-PK085-100-WH Datasheet(HTML) 2 Page - Bourns Electronic Solutions |
2 / 7 page Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. TBU-PK Series - TBU® High-Speed Protectors Functional Block Diagram Reference Application The TBU-PK Series are high-speed protectors used in voice/ VolP 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. The TBU® device, constructed using MOSFET semiconduc- tor 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 system voltages and any other voltages including the surge in each case up to rated limits. When the voltage on the SLIC output is driven below (Vbat – Vto) the TBU-PK 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 MOV 1 4 2 8 5 6 MOV TBU® Device GND -VBAT Line 1 SLIC Vdd Vss Line 2 SLIC Line 1 Line 2 C1 C2 |
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