LED driver delivers accurate output current, high efficiency
1 min read
The latest addition to Power Integrations' family of led driver ics is the LYTSwitch-4, aimed at delivering accurate output current and high efficiency for bulb and tube applications and high bay lighting.
The 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 can meet EN61000-3-2C regulations for total harmonic distortion; optimised 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.
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.
Andrew Smith, senior product marketing manager for Power Integrations, commented: "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."
