littelfuse tvs diode ac and dc power line circuit protection application note

littelfuse tvs diode ac and dc power line circuit protection application note
Application Notes:
Wireless Network Base Station
AC and DC Power Line Circuit Protection
Base Station power line protection devices help prevent service
disruptions to customers, improve system reliability and lower
maintenance costs
Wireless network base stations need protection from over voltage and
over currents which can be caused by lightning and power line accidents
and other disturbances. Base stations are often located in remote
and lightning-prone areas, where access to quick and efficient repair is
difficult and expensive. Using appropriate protective circuits and devices
will lower damage risks.
Power Input Line Risks and Protection
The main sources of danger to wireless network base stations are
lightning and power faults. A strike directly to or nearby the tower can
produce high voltages and cause huge currents to flow through the
power input lines. Similar surges can be produced by short circuits to
higher-voltage transmission lines and switching transients. The resulting
damage will incur repair time, service downtime and and disruptions to
customers.
The most appropriate protection for these power input lines are a
combination of fuses and high power TVS Diodes installed in the AC
power distribution box.
Using appropriate protective devices improves reliability and minimizes field service calls.
Littelfuse high power
AK / LTKAK Series TVS
Diodes were specifically
designed for high
energy transient voltage
protection applications.
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© 2015 Littelfuse, Inc.
Application Note:
Wireless Network Base Station
AC and DC Power Line Circuit Protection
Series
Reverse
Standoff
Voltage (VR)
AK1
76
AK3
15
30
58
66
76
150
170
208
380
430
30
58
66
76
170
190
240
380
430
Package Type
Peak Pulse
Current
(IPP 8/20µs)
AK6
AK10
AK15
LTKAK6 LTKAK10
Littelfuse AK/ LTKAK Series high energy TVS
Diodes offer superior clamping performance
over standard Silicon Avalanche Diode (SAD)
Technologies.
15
30
58
66
76
170
190
240
380
430
530
58
66
76
58
66
76
Axial Lead
1000A
3000A
6000A
58
66
76
Surface Mount
10000A
6000A
15000A
TVS Polarity
Bidirectional
Maximum
Clamping
Voltage (VC)
Please refer to electrical characteristics table
within each product series data sheet
HalogenFree
Yes
RoHS
Yes
Pb Free
Yes
Compliant
Littelfuse AK / LTKAK Series
TVS Diodes
10000A
The AK / LTKAK Series offers unique
characteristics which provides a clamping
voltage lower than the avalanche voltage and
above the rated working voltage. Any voltage
rise due to increased current conduction is
contained to a minimum, providing the best
possible protection level.
Littelfuse AK / LTKAK Series TVS Diodes can
also be connected in series and / or parallel to
create very high capacity protection solutions.
Higi Power AK Series TVS Diodes offers a
better and solution than more conventional
overvoltage protection methods, while the
latest surface mounted version LTKAK series
offer a low profile, reflow solderable option for
compact space requirement.
Power Module
(Xfmr, Rectifier, etc.)
Compare to Conventional Technology,
AK/ LTKAK Series Offer Benefits:
Power System
•
•
•
•
•
•
TVS Diode
AK Series
or LTKAK Series
Power Plug
High power TVS Diode protectors in the power supply configuration
offer advantages over conventional methods, including no wear-out
mechanism, faster response and compact design.
Precise clamping voltage
No wear-out mechanism
Lower leakage
Faster response
Compact design
Truly surface mountable package
option for LTKAK series
• Improved lead inductance for
LTKAK series
• Improved heat sink capability
for LTKAK series
• Total power consumption saving and
easy design by using AK/LTKAK
series that eliminate inductor design
Visit www.littelfuse.com/TVS-Diode.html
for technical application articles and reference designs serving a wide range of applications.
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