Reference Design Report for a 5 W Dimmable Power Factor Corrected LED Driver (NonIsolated) Using LinkSwitchTM-PL LNK457DG

The RD-251 provides a single constant current output of 350 mA over an LED string voltage of 12 V and 18 V. The output current can be reduced using a standard AC mains TRIAC dimmer down to 1% (3 mA) without instability and flickering of the LED load. The board is compatible with both low cost leading edge and more sophisticated trailing edge dimmers.

The board was optimized to operate over the universal AC input voltage range (85 VAC to 265 VAC, 47 Hz to 63 Hz) but suffers no damage over an input range of 0 VAC to 300 VAC. This increases field reliability and lifetime during line sags and swells. LinkSwitchPL based designs provide a high power factor (>0.9) meeting current international requirements and enabling a single design to be used worldwide.


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