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LED Driver

Photonics Spectra
Jul 2010
National SemiconductorRequest Info
 
National Semiconductor Corp. has announced the LM3464 LED driver with dynamic headroom control and multiple outputs for high-power applications such as industrial, street and automotive lighting. It accurately and efficiently drives up to four strings of LEDs. The PowerWise controller maximizes system efficiency, simplifies design and reduces system cost. The driver includes four channels and drives up to 20 LEDs per channel, and its dynamic headroom control feature adjusts the supply voltages of the LED strings through the power supply feedback to the lowest level required to provide optimal system efficiency. By directly controlling the output of the offline regulator, the driver can eliminate the second stage switching regulator commonly required for offline LED power supplies.


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GLOSSARY
feedback
The transfer of a part of a device's or circuit's output back to its input.
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