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. Littelfuse.com 1 © 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. Littelfuse.com 2 © 2015 Littelfuse, Inc.
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