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Flicker-free TRIAC dimming LED drivers enable PF > 0.9

Posted: 16 Jun 2010     Print Version  Bookmark and Share

Keywords:LED driver  TRIAC  solid-state lighting 

LinkSwitch LED drivers

Power Integrations unveils two families of power-factor-corrected LED driver ICs that deliver flicker-free monotonic TRIAC dimming. The single-stage, power-factor-corrected LED driver ICs target solid-state lighting (SSL) applications. LinkSwitch-PH (optimised for isolated systems) and LinkSwitch-PL (optimised for non-isolated systems) deliver a user experience similar to that provided by incandescent illumination.

The LinkSwitch-PH and LinkSwitch-PL product families feature integrated single-stage power factor correction (PFC), enabling SSL luminaires to achieve PF > 0.9. LinkSwitch-PH devices incorporate primary-side-control technology, which eliminates the optocoupler and supporting components used in traditional isolated flyback designs. Non-isolated LinkSwitch-PL designs further reduce component count, resulting in improved reliability and a reduced BOM. Both IC families are monolithic—incorporating the controller and MOSFET onto a single silicon die—which simplifies PCB layout by minimising component count and eliminating parasitics between the controller and power MOSFET. These new LinkSwitch products are optimised for high efficiency in simple flyback designs and operate at input voltages up to 305Vac, enabling the development of both single-voltage and universal-input products suitable for residential and commercial lighting applications worldwide.

When operated within manufacturers' temperature and drive-current guidelines, LEDs can be expected to operate for more than 50,000 hours. The weakest link in an LED lighting system is the driver circuitry, which is burdened with unreliable optocouplers and electrolytic capacitors. Power Integrations' accurate primary-side-control technology, featured in LinkSwitch products, eliminates the optocoupler, and the new LinkSwitch LED driver IC product families do not require the use of electrolytic bulk capacitors. Designers using the LinkSwitch-PL and LinkSwitch-PH for SSL products can expect the operational life of the driver to match that of its accurately controlled LED array.

"Both new product families are ideal for space-constrained LED drivers used in replacement lamps," said Bill Weiss, lighting business development manager at Power Integrations. "The LinkSwitch-PH family, optimised for isolated designs and rated up to 50 watts output power, is also exceptionally effective for external LED ballasts, often used in downlighting, architectural lighting, signage, and outdoor lighting. Both devices reduce system BOM count and size, thereby increasing system reliability. These ICs enable designers to optimise system efficiency and meet or exceed all regulatory standards, such as ENERGY STAR and EN61000-3-2."

LinkSwitch-PH samples are available now in a halogen-free, ROHS-compliant eSIP-7C package, priced between Rs.54.49 and Rs.78.96 ($1.18 and $1.71) each for 10,000-piece quantities. LinkSwitch-PL ICs will sample in August 2010 in compact SO-8 and eDIP-12 packages.

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