Multi-chip white LED modules
17 April 2008
Multi-chip white LED modules from Solid State Supplies combine eight LEDs in two channels.
High-powered InGaN blue LEDs produce brilliant white light for general lighting applications, amusement and gaming equipment, and for backlighting TFT displays.
The modular design allows the SEPW devices to be assembled into string arrays, by connecting the modules in series. A high density of LEDs can be achieved for what is described as excellent colour balance throughout.
Arrays also minimise the distance which power and control lines would have to run between LEDs and from the LEDs to the control electronics.
Despite their high light emissions, 50lm, output with all LEDs illuminated, the SEPW devices use just 100lm/W (@ 20mA, with all LEDs illuminated, or the equivalent of fluorescent lamps.
The white thermoplastic case has a heatsink which is moulded to the bottom of the package for thermal management. The heatsink can be fitted directly to an external radiator through the PCB allowing denser module population.
The white resin compound is formulated for high levels of light reflection and transmission. The leadframe is plated with silver, providing a reflective surface for the bottom and sides of the emitting area. The terminals and heatsink are also silver-plated.
The SEPW devices can be mounted in tight arrays on a single PCB substrate for ease of manufacture and to provide a dense, uniform appearance when illuminated.
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