Led Design Guide Page 8 LED Design Guide

LED Lighting Design Guide 2015 Littelfuse LED Lighting Design Guide www.littelfuse.com Surge Immunity Requirements for Consumer LED Lighting/ Retrofit Lamps Fuses, MOVs and TVS diodes from Littelfuse are critical in helping the lamp manufacturer pass important regulatory and safety standards. The United States is leading the way for establishing uniform performance and safety standards for certain indoor commercial lighting as well as roadway, parking lot and garage illumination. EPA's Energy Star surge specifications apply to the PAR30, PAR38, A-19, MR16, Candelabra, G-globe, and R-reflector types of LED retrofit lamps. Some IEC Requirements. With the exception of the US, which uses other standards, overvoltage transient surge testing per IEC 61000-4-5 is a global requirement for LED lighting assemblies. In addition, part of IEC61547, "Equipment for General Lighting Purposes" requires EMC immunity testing. Figure 4 shows two waveforms that define rise time and duration of the test voltage and current. 0 0.2 0.4 0.6 0.8 1.0 10 20 30 40 50 Duration = 20 s Time ( s) I(t)/Ip Front Time = 8 s Combination Wave short-circuit current Figure 4. IEC 61000-4-5 surge immunity test waveforms: 1.250s open circuit voltage and 820s short circuit current. 0 0.2 0.4 0.6 0.8 1.0 20 40 60 80 100 Front Time = 1.2 s Duration = 50 s Time ( s) V(t)/Vp Combination Wave open-circuit voltage Surge Immunity Requirements for Consumer LED Lighting/Retrofit Lamps 8

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