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TBU-PK Series - TBU ? High-Speed Protectors
Functional Block Diagram
HIGH
Line 1 SLIC
Vss
Line 2 SLIC
CURRENT
SENSE
Vdd
VOLTAGE
COMPARATOR
Vss
Vdd
VOLTAGE
COMPARATOR
Vss
CURRENT
SENSE
VOLTAGE
SWITCH
+
+
HIGH
VOLTAGE
SWITCH
Line 1
Vdd
Line 2
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 ?tted between the Tip and Ring
connections and ground.
Basic TBU Operation
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 I trigger . 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 in each
case up to rated limits.
GND
Vdd
Line 1
4
2
1
Line 1
When the voltage on the SLIC output is driven below
(V bat – V to ) the TBU-PK series device switches to the
blocking state, regardless of output current in the device.
SLIC
MOV
C1
After the surge, the TBU ? device resets when the voltage
Line 2
SLIC
Vss
5
TBU ?
Device
6
8
MOV
C2
Line 2
across the TBU ? device falls to the V reset level. The TBU ?
device will automatically reset on lines which have no DC bias
or have DC bias below V reset (such as unpowered signal lines).
If the line has a normal DC bias above V reset , the voltage
across the TBU ? device may not fall below V reset after the
surge. In such cases, special care needs to be taken to ensure
-VBAT
that the TBU ? device will reset, with software monitoring as one
method used to accomplish this. Bourns application
engineers can provide further assistance.
Speci?cations are subject to change without notice.
Customers should verify actual device performance in their speci?c applications.
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TBU-PL060-100-WH 功能描述:浪涌抑制器 Dual 50ohm TBU Devce Bi-directional RoHS:否 制造商:Bourns 电压额定值:40 V 电流额定值:750 mA 工作温度范围:- 40 C to + 125 C 端接类型:SMD/SMT 封装 / 箱体: