Reference design for dimmable LED spotlight

Power Integrations has released a reference design for a dimmable PAR38 spotlight, developed in collaboration with Cree Inc. The reference design, described in DER-350, uses Power Integrations' LYT4317E, a member of the company's LYTSwitch-4 family of single-stage drivers, along with Cree's MT-G2 EasyWhite LEDs.

DER-350 includes an isolated, high-power-factor, TRIAC-dimmable LED driver optimised to deliver an LED current of 550mA at 36V (nominal) from an input voltage range of 90-132VAC. The combined PFC and CC single-stage, isolated topology of the LYTSwitch-4 IC claims to deliver excellent efficiency, power factor of 0.98 and low component count. Over-voltage, over-current and over-temperature protection features are built-in.

DER-350 also showcases the LYTSwitch-4 IC's TRIAC dimming with sub-200ms start-up, reduced pop-on and no dead-travel, easily satisfying NEMA dimming curve requirements, for both leading-edge and trailing-edge dimmers.