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AB20-3 Datasheet(PDF) 7 Page - Lumileds Lighting Company |
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AB20-3 Datasheet(HTML) 7 Page - Lumileds Lighting Company |
7 / 37 page 7 limiting resistor may be chosen to overly restrict the forward current through the array. Another possibility is that if the circuit is designed to accommodate every LED emitter in a given array being at their worst case minimum or maximum limits, then design might eliminate several potential circuit topologies because of excessive light output variations. In practice, the likelihood of these conditions actually occurring is so small, that the design process might have eliminated more cost effective circuit topologies. For this reason, Lumileds Lighting recommends that worst case design be used as a development tool in conjunction with characterization and validation of the signal lamp assembly. Following this paper design, a working prototype LED signal light can be constructed. This prototype serves several purposes. First, it allows verification of the electrical design. The forward current can be measured at different input voltages and compared with the paper electrical design. Second, it allows verification of the optical design. In AB20 1 section, “Estimating the Number of LED Emitters Needed,” assumptions were made for the optical transmission losses. The prototype allows these assumptions to be measured. Third, the working prototype allows the thermal properties of the LED signal light to be evaluated. The thermal resistance, R θPIN A, can be measured by attaching thermocouples to the cathode pins of several LED emitters in the array. Based on the electrical, optical, and thermal measurements of the working prototype, additional iterations of the design may be required. These design iterations will further refine the estimates for the electrical component values, the number of LED emitters needed for the signal lamp, and the thermal resistance of the signal lamp. Also, it may be necessary to evaluate improved optical designs and methods for improving the thermal properties of the LED signal lamp assembly. For more information on thermal design, the reader is encouraged to review AB20 4 “Thermal Management Considerations for SuperFlux LEDs.” For more information on optics design, the reader is encouraged to review AB20 5 “Secondary Optic Design Considerations for SuperFlux LEDs.” |
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