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Power factor corrected AC-DC drivers for LED lighting apps

Posted: 05 Jan 2015     Print Version  Bookmark and Share

Keywords:ON Semiconductor  AC-DC driver  LED  flyback controller  lighting 

ON Semiconductor has unleashed two line-ups of power factor corrected (PFC) offline AC-DC drivers aimed at high performance LED lighting applications. The NCL30085, NCL30086 and NCL30088 extend the NCL3008x family and address single stage design implementations up to 60W that require high power factor. The NCL30030 devices support higher power (up to 150W) two stage topologies that require low optical ripple and wide LED forward voltage variation, detailed the company.

The NCL30085, NCL30086 and NCL30088 use a PFC current control algorithm that makes them suitable for flyback buck-boost and SEPIC topologies. By operating in quasi-resonant mode, these devices are able to deliver optimum efficiency across wide line and load levels, ON Semi noted. The innovative control methodology they employ allows strict current regulation to be achieved (within two per cent typically) solely from the primary side.


The non-dimmable NCL30088 is complemented by the NCL30086, which is smart-dimmable, supporting analogue and/or pulse-width modulation (PWM) dimming with a single input that controls the average LED current. Completing the series is the NCL30085 which supports three levels of log step dimming (70 per cent, 25 per cent and five per cent). As a consequence, it permits light output reduction by toggling the AC switch on/off to signal the controller to lower the LED current point. All three devices feature user configurable current thermal fold-back mechanisms that help prevent overheating and enable manufacturers to support longer lifetime warranties.

The NCL30085 and NCL30088 are offered in SOIC-8 packages, while the NCL30086 is offered in SOIC-10 package with pricing of the series starting at $0.35 per unit in 10,000 unit quantities.

The NCL30030 is a two stage PFC controller plus quasi-resonant flyback controller optimised for medium and high power LED lighting applications up to 150W. This device is best suited for commercial lighting such as lowbay, highbay and streetlighting. The NCL30030 makes use of a proprietary multiplier architecture to achieve low harmonic distortion and near-unity power factor while operating in critical conduction mode.

The NCL30030 is in an SOIC?16 package with one pin removed for high voltage spacing and pricing starts at $0.65 per unit in 10,000 unit quantities.

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