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LED Technology

load. If this occurs then the power supply can either limit the output current, limit the output power or shut itself down completely. This again will limit the damage to the load, and also the power supply itself. Surge Protection: IEC 61000-4-5 establishes a common reference for evaluating the immunity of electrical and electronic equipment when subjected to surges. The test method documented in this part of IEC 61000 describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon. Surge test standards for lightning

protection as below, IEC6100-4-5 ranks:

any given supply. A key focus in the LED driver industry is cost. In being able to source a smaller and lighter power supply your transportation cost will reduce significantly. However, you will need to seek assurance from your vendor that this has been achieved without any impact on the points discussed above. If this can be achieved, then you should expect to see a cost saving proportional to the size reduction as you can now transport more units in the same size packaging and weight. As a direct example the LDB product range has a 40% saving per volume and a 35% saving on weight over other parts available in the market today. In conclusion, while the highlight points on a datasheet are a good starting point, the user needs to be aware of how the driver will perform in respect to their particular power requirements. Important aspects of the design might be Higher Power Density,

Lower weight and profile, water ingress and dust ingress levels and so on. But if the part is not an optimum solution for your application, you may very will struggle to meet your target of luminaires per Watt. It is only with a full understanding of the available performance levels that you will you be able to determine if the power supply is the optimum solution for your needs.

Excelsys Technologies |

Size and weight - One aspect of the design which is often overlooked are the indirect benefits of being able to successfully increase the power density of

Shane Callanan is Director of Applications Engineering, Excelsys Technologies

Components in Electronics

February 2012 11

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