Combined PFC/CC converter chip raises efficiency of LED street lamp drivers to more than 92 percent

August 16, 2012 // By Paul Buckley
Power Integrations has made two new additions to the company’s LinkSwitch-PH IC family. The devices allow commercial lighting applications up to 75 W to benefit from single-stage design, dramatically reducing BOM cost and enabling a smaller driver with high efficiency.

LNK410EG (dimming) and LNK420EG (non-dimming) provide a constant-current output with a PF- corrected  and  low THD input. The capabilities of the new devices are showcased in RDR-290, a reference design describing a single-output driver for high-bay lighting.

RDR-290 is 92.2% efficient at 230 VAC for a 75 W output design while easily meeting EN61000-3-2 class C limits. Power factor is above 0.95. No primary high-voltage electrolytic bulk capacitor is required, making lifetimes of 50,000 hours practical, even in challenging outdoor environments and at high ambient temperatures.

RDR-290 is freely downloadable from the Power Integrations website at www.powerint.com/sites/default/files/PDFFiles/rdr290.pdf