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LED driver ICs for solid-state lighting tasks

By Power Integrations on

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Power Integrations has launched two families of Triac-dimmable, single-stage, power-factor-corrected LED driver ICs aimed at commercial and residential solid-state lighting (SSL) applications.

Linkswitch-PH (optimised for isolated systems) and Linkswitch-PL (optimised for non-isolated systems) deliver flicker-free monotonic Triac dimming and a user experience similar to that provided by incandescent illumination.

The 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 bill of materials.

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 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.

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 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.

Bill Weiss, lighting business development manager at Power Integrations, said: ‘Both new product families are ideal for space-constrained LED drivers used in replacement lamps.

‘The Linkswitch-PH family, optimised for isolated designs and rated up to 50W output power, is also effective for external LED ballasts often used in downlighting, architectural lighting, signage and outdoor lighting.’

Power Integrations

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Power Integrations is the leading supplier of high-voltage integrated circuits used in energy-efficient power conversion. The company’s innovative technology enables compact, energy-efficient power supplies in a wide range of electronic products, in AC-DC, DC-DC and LED lighting applications. Since its introduction in 1998, Power Integrations’ EcoSmartä energy-efficiency technology has saved an estimated $4.5 billion of standby energy waste and prevented millions of tons of CO2 emissions. The company’s Green Room web site provides a wealth of information about “energy vampires” and the issue of standby energy waste, along with a comprehensive guide to energy-efficiency standards around the world. Reflecting the environmental benefits of EcoSmart technology, Power Integrations is included in clean-technology stock indices sponsored by the Cleantech Group (Amex: CTIUS) and Clean Edge (Nasdaq: CELS).

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