White LED Driver Guarantees Matching LED Brightness


Posted on Jul 2, 2012

White LEDs are widely used in small LCD backlight applications for simplicity, high reliability and low cost. However, due to variations in the forward voltage drop of white LEDs, matching the brightness becomes a major design consideration for multiple LED applications. Since LED brightness is proportional to current rather than voltage, a constant-current source driving LEDs in series should be used to ensure the same illumination of each LED. The LT®1932 uses a constant-current step-up architecture that directly regulates the LED current and guarantees a constant light intensity in each LED, regardless of differences in their forward voltage drops.






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