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ICs deliver accurate output current and high efficiency for bulb and tube applications

Tue, 11/19/2013 - 1:07pm

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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.

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. High-line LYTSwitch-4 ICs are sampling now in eSIP-7C (E) and eSIP-7F (L) packages, priced from $0.58 (non-dimming) to $0.62 (dimming) in 10,000-piece quantities. Reference designs are downloadable at http://www.powerint.com/en/design-support/reference-designs/design-examples. Product datasheet and product introduction videos are also available on the Power Integrations website at http://www.powerint.com/products/lytswitch-family/lytswitch-4.

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