This circuit drives as many as four white LEDs in parallel from a 3.3V source, and adjusts the total LED current from 1mA to 106mA, in 64 steps of 1dB each.
A loss of AC power during darkness (sensed by a photoresistor) turns on an array of battery-powered white LEDs. To conserve power, a timer turns off the LEDs after a particular period of time (for example, 10 minutes).
Applications Manager, Portable Power Products Many of today’s portable electronics require backlight LED-driver solutions with the following features: direct control of current, high efficiency, PWM
A simple, traditional method of powering white light-emitting-diodes (LEDs) with fixed bias voltage and ballast resistors result in poor brightness matching between LEDs. This is due to wide LED forwa
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