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Employing 300 mA discrete LED driver

Posted: 14 Dec 2010     Print Version  Bookmark and Share

Keywords:NXP Semiconductor  PBSSxxx  MEGA Schottky 

This application note focuses on a 300 mA discrete LED driver, based on a buck-converter principle with an efficiency of 80 to 90 %. It includes a proposal for a BOM and layout leading to a low cost, low component count solution to drive a single LED or a string of LEDs connected in series.

The choice of the discrete parts is discussed with respect to NXP Semiconductor's bipolar low VCEsat (BISS) and ultra low V VCEsat MEGA Schottky technologies, i.e. the PBSSxxx series and the PMEGxxx series.

Key applications for the driver are lighting applications, where constant LED brightness, high efficiency and low cost are important features. For example automotive lighting applications require that general illumination and signage should not consume too much power when the motor is not running. The input voltage of +6 V to +18 V supports automotive requirements, too.

Besides, battery driven handhelds like flash lights or head lamps will benefit from the topology and efficiency the driver delivers.

View the PDF document for more information.

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