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Driving multiple LEDS at 350mA using bipolar junction transistors, high side current sensing and an NCP3063 controller

Posted: 11 Sep 2008     Print Version  Bookmark and Share

Keywords:multiple LEDs  350mA  constant current  forward voltage drops 

This application note and associated demo board will focus on driving multiple LEDs at a regulated 350mA, from low voltage DC or AC sources commonly used in lighting applications.

Unlike traditional lighting, LEDs require driver solutions that address the challenges of providing a constant current to a load whose output voltage can vary by ±30 per cent because of process and temperature effects.

Due to the steep V/I curve of the LED and to achieve optimum performance, it is critical to drive LEDs with a constant current to achieve the specified brightness and colour. For high brightness power LEDs, the specified current may be in the range 150- to 1500mA, 350mA being a common value.

By combining LED manufacturer's data, taken from several product families, it is possible to come up with minimum and maximum forward voltage drops for a "generic" LED, operating at a specified current.

View the PDF document for more information.

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