Power Integrations is offering a reference design for a 5W offline LED driver that includes flicker-free TRIAC dimming and single-stage power factor correction (PFC).

Based on the firm’s LNK457DG LED driver, the reference design provides a single constant-current output of 350mA at a nominal LED string voltage of 15 V.

The output current can be reduced using a standard AC mains TRIAC dimmer down to 1% (3mA) without instability or flickering of the LED array.

The supply is designed to be compatible with both low-cost, leading-edge dimmers and more sophisticated trailing-edge dimmers.

It operates over the universal AC input range (85Vac to 265Vac, 47Hz to 63Hz) and can withstand an input range of 0Vac to 300Vac, improving field reliability and lifetime during line sags and swells.

Power factor is specified greater than 0.9 and input current total harmonic distortion (THD) is less than 10% at 115Vac and less than 15% at 230Vac.

The board fits inside a pear-shaped A19 LED replacement lamp with an E26/27 base. RDK-251 contains full power supply specifications, schematic, bill of materials, transformer documentation, printed circuit board layout, and performance data.

www.powerint.com/rdk