TBU-DF datasheet(2/7 Pages) BOURNS

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TBU-DF Series - TBU® High-Speed Protectors

Reference Application

The TBU® devices are general use protectors used in a wide

variety of applications, including telecommunications, industrial

communications and automotive battery management systems.

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® TISP® Overvoltage Protectors or MOVs. For band-

width sensitive applications, a Bourns® GDT may be substituted

for the MOV.

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 transient events.

When operated, the TBU® device will limit the current to less

than the Itrigger value within the tblock duration. If voltage

above Vreset is continuously 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.

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).

Basic TBU Operation

TBU® Device

Load

Line

Side

OVP

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