Power Integrations Completes Rollout of LYTSwitch-4 LED-Driver IC Family

Power Integrations, Inc. today 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. 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. 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.