Led Design Guide Page 26 LED Design Guide

LED Lighting Design Guide 2015 Littelfuse LED Lighting Design Guide www.littelfuse.com Design Considerations for PLED Protectors Applications for PLED protection devices are found in LED versions of traffic lights, roadway lighting, parking lot lights, airport lighting, billboard illumination, commercial signage, at railroad crossings, and in medical / surgical lighting. All these applications require high reliability, which means high up-time with little to no maintenance. To ensure maximum reliability, high brightness LEDs must be protected against wire bond failures, ESD/EFT events, lightning surges, and reverse power connections. PLED6 Active PLED6 + ~1.3 V - Constant Current Source Open LED Figure 15. PLEDs protect series wired LED strings should one fail as an open circuit, the most common failure mode. Normal Operating Voltage Type, DC or AC Device Type Required: Uni-Directional or Bi-Directional + Normal Operating Voltage, V Maximum Transient Current (Ipp) Maximum Clamping Voltage (Vc) Required Peak Reverse Surge Power Rating, W Product Mounting Type (Package) Operating Temperature Range Table 7. This fill-in form for circuit operating parameters is the first step in selecting a TVS diode. Design Considerations for PLED Protectors 26

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