EDN

Balancing LED Current in Parallel String

Another important concern is the balance of currents that flow in multiple strings. We know that two or three strings of LEDs will have different combined forward voltages. The LED driver will deliver ...
Electronic Design

LED-String Driver Operates from Single Cell

This file type includes high-resolution graphics and schematics when applicable. This design describes how to light a string of LEDs of any color from a 1.5-V cell using just a few inexpensive ...
Electronic Design

Driver Powers Up to Six Strings of LEDs

TDK-Lambda has launched its second generation ALD6 series of multi-output dc-dc backlight LED drivers. TDK-Lambda has launched its second generation ALD6 series of multi-output dc-dc backlight LED ...
EDN

Diagnose LEDs by Monitoring the Switch-Mode Duty Cycle

A change in the forward voltage (VF) for a string of series-connected, high-brightness LEDs (HB LEDs) can indicate deterioration or complete failure of one or more of the LEDs. Accordingly, this ...