Specifications are subject to change without notice.

Customers should verify actual device performance in their specific applications.

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

OVP device should be employed to limit the maximum voltage.

device may require capacitors to be fitted between the Tip and

Ring connections and ground.

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

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

blocking state, regardless of output current in the device.

device will automatically reset on lines which have no DC bias

surge. In such cases, special care needs to be taken to ensure

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

Device

GND

-VBAT

Line 1

SLIC

Vdd

Vss

Line 2

SLIC

Line 1

Line 2

C1

C2