Constant current LED demo board

6 August 2008 Opto-Electronics

VI Chip, a subsidiary of Vicor, has announced a constant current PRM regulator demonstration board for light emitting diode (LED) applications such as street and stadium lighting, high-end projectors, active outdoor advertising and architectural installations.

The board provides a precisely regulated current as required for direct-drive multiLED applications where the intensity and brightness are controlled by regulating the current through the LEDs. The board can be used to provide adjustable current up to 240 W (5 A at 48 V) when employed as a standalone non-isolated source or can be combined with the range of VTMTM transformers to provide an adjustable isolated current up to 100 A.

A PRM+VTM pair uses less than 1 W for every 1000 Lumens generated by the LEDs for high performance applications. This solution is an ideal complement to using BCMTM bus converters with low voltage driver ICs for lower power applications such as LED TV backlighting.

The constant current board demonstrates the high power density of the PRM with current accuracy of 99,7% across the load range. The board has Kelvin connections for measuring the efficiency of the VI Chip components independent of load connect losses. Oscilloscope probe jacks are available for measuring output voltage, including output voltage ripple. The board has fused PRM inputs, provision for mounting an optional pushpin heatsink, and system enable and disable.

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