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 ...
EDN

Low-duty-cycle LED flasher keeps power draw at 4 mW

Battery-operated equipment oftenwill benefit from a power-on indicator.The indicator, however, can wastesignificant power. In situations where alow-duty-cycle blinking indicator providesan adequate ...