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Intersil unveiled single-ended LED driver controllers

Posted: 04 Feb 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Intersil? LED driver controller? ISL1903? ISL1904? CrCM?

Intersil Corp. has announced a couple of single-ended buck and flyback LED driver controllers that operate in critical conduction mode (CrCM) and claims to deliver the industry's highest efficiency and dimming performance in industrial and commercial lighting systems. The ISL1903 and ISL1904 support single-stage conversion of the AC mains to a constant current source with power factor correction (PFC), added the company.

Geared for isolated and non-isolated power applications, the ISL1903 supports buck converter topologies including isolated forward converters and non-isolated source return buck converters. The ISL1904 supports isolated flyback as well as non-isolated SEPIC and Boost topologies. They operate in CrCM to allow near zero-voltage switching, maximising both efficiency and magnetic core utilisation. Both the ISL1903 and ISL1904 may also be used with DC input sources.

Both devices claim to deliver near-universal dimmer compatibility, and are designed for industrial and commercial lighting installations and retrofits. Additionally, they can be used in DC or AC input LED ballasts and in universal AC mains input LED retrofit lamps.

According to the company, the device feature configurable for either PWM or DC current dimming control of LEDs and are compatible with leading and trailing edge dimmers. In addition, the controllers promise zero to 100 per cent dimming capability and its corrected power factor of 0.995 enables Energy Star rating. The device delivers less than 20 per cent harmonic content and its closed loop soft-start assures no overshoot. Likewise, the controllers' primary side current sensing eliminates the need for opto-couplers, lowering BOM cost.

Operating from -40C to 125C, the ISL1903 and ISL1904 are available in compact 16-lead QSOP packages, with prices starting at $0.84 each in 1,000-unit quantities.

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