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Offline TRIAC Dimmer LED Reference
National Semiconductor
Description
Reference design converts 90 VAC to 135 VAC input and drives 7 or 8 series-connected LEDs from 300 to 600 mA average current. The LM3445 switching frequency is set at 225 kHz. This 4-layer board uses the bottom and top layers for component placement. It can be modified to adjust LED forward current, number of series-connected LEDs and switching frequency.
Company Overview
National Semiconductor creates energy-efficient analog and mixed-signal semiconductors as well as SolarMagicT power optimizers. Its PowerWise® products enable systems that consume less power, extend battery life, and generate less heat. National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, communication interface products and data conversion solutions. Headquartered in Santa Clara, Calif., National reported sales of $1.46 billion for fiscal 2009 which ended May 31, 2009
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