Power Integrations Adds High-Line Parts to LYTSwitch-4 LED-Driver IC Family

Power Integrations added devices optimized for high-line applications, completing the roll-out of its LYTSwitch™-4 LED-driver IC family. LYTSwitch-4 ICs deliver accurate output current and high efficiency for bulb and tube applications and high-bay lighting. The devices simplify design and reduce cost while ensuring that lamps deliver uniform light output and provide exceptional performance in TRIAC-dimmable applications.


LYTSwitch-4 ICs feature a combined PFC and CC single-stage converter topology resulting in a power factor greater than 0.95 and efficiencies of over 90% in typical applications. Designs based on the new drivers easily meet EN61000-3-2C regulations for total harmonic distortion (THD); optimized designs deliver less than 10% THD. Regulation is better than +/- 5% across load and production spread, reducing the need for over-design to meet minimum luminance targets, cutting system cost. The devices’ high switching frequency (132 kHz) enables smaller, lower-cost magnetics to be used, and frequency jittering reduces EMI filtering requirements. These factors enable LED-driver designs to fit easily into space-restricted bulb styles.


Comments Andrew Smith, senior product marketing manager for Power Integrations: “LYTSwitch-4 LED-driver ICs have proven very popular since the initial launch of the low-line parts, due to a combination of efficiency and excellent dimming performance. Even when used with leading-edge and trailing-edge TRIAC dimmers, and at low conduction angles, designs comply with NEMA SSL-7. Start-up is very fast, typically less than 500 ms, even when dimmed to less than 10% light output, and pop-on is virtually eliminated.”


Designers can evaluate the new LYTSwitch-4 LED-driver IC family using a new high-line LED lighting reference design that has been co-developed with Cree. DER-396 describes a PAR38 spotlight LED driver design. These documents and all other similar reference designs with Cree are hosted at http://www.powerint.com/ledrivers/cree.


LYTSwitch ICs enable small, longer-lasting lamps in a wide range of applications including consumer bulbs, commercial lighting and T8 tubes, industrial, high-bay and exterior lighting. LYTSwitch devices also offer all the usual safety features common to Power Integrations products, including over-voltage, over-current and over-temperature protection. In addition LYTSwitch devices do not need an optocoupler or electrolytic bulk capacitors, reducing component count and increasing reliability.
 

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