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LED ref design aimed at candelabra bulb substitute

Posted: 08 Mar 2011     Print Version  Bookmark and Share

Keywords:drivers  LED  lighting  design 

Power Integrations reveals the RD-268 design, a reference design for candelabra-style replacement bulbs that features TRIAC dimming support, low total harmonic distortion (THD), and high power factor.

The RD-268 design is based on the LNK454DG LinkSwitch-PL family of LED driver ICs and meets the compact requirements of standard candelabra-shaped bulbs.

RD-268 provides a single constant-current output of 366mA with an LED nominal voltage of 3V, for a total of 1.1W. This yields approximately 100lumens of light output, which is similar to a 15W conventional incandescent candelabra lamp. The reference design is optimised to operate from 85-300VAC, which allows manufacturers to make bulbs suitable for use in all regions and increases field reliability and lifetime during line sags and swells. Importantly, the >0.9 power factor and THD of less than 15 per cent at 115VAC enable a single design to be used worldwide and in multi-lamp fixtures, where overall power use exceeds various regional power quality regulatory thresholds at 5W and 25W.

Introduced last year, the LinkSwitch-PL IC family enables small, low-cost, TRIAC-dimmable, constant-current drivers for solid-state lighting. LinkSwitch-PL devices are optimised for direct LED current sensing, operate over a wide input voltage range, and deliver output power up to 16W. An innovative control algorithm provides flicker-free TRIAC dimming with minimal external components. Each device incorporates a 725V power MOSFET, single-stage power factor correction, a novel discontinuous-mode variable-frequency / variable-on-time controller, frequency jittering, cycle-by-cycle current limit, and hysteretic thermal shutdown—all in a monolithic IC.

LinkSwitch-PL devices are available now in SO-8, eSOP, and eDIP packages, and are priced as low as Rs.39.11 ($0.86) each for 10,000-piece quantities.

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