Opto-Electronics


PAR38 LED spotlight reference design

13 November 2013 Opto-Electronics

Power Integrations has collaborated with Cree to develop a reference design for a dimmable PAR38 spotlight. The new reference design, described in DER-350, uses PI’s new LYT4317E, a member of the company’s LYTSwitchTM-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 550 mA at 36 V (nominal) from an input voltage range of 90 V a.c. to 132 V a.c. The combined PFC and CC single-stage, isolated topology of the LYTSwitchTM-4 IC delivers high efficiency, power factor of 0,98, and low component count. Over-voltage, over-current and over-temperature protection features are built-in.

The reference design also showcases the IC’s TRIAC dimming with very fast sub-200 ms startup, reduced pop-on and no dead-travel, easily satisfying NEMA dimming curve requirements, for both leading-edge and trailing-edge dimmers.



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