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High-Brightness LED Driver Manages Device’s Temperature

The LM3424 is a LED driver with temperature management control and the addition of an online design environment to support it. The device features temperature-management control based on thermal foldback to enable lighting designers to quickly and easily design a reliable thermal system using the LM3424. With it, lighting designers can program temperature and slope breakpoints within which the LEDs operate safely. When an over-temperature condition occurs, the LM3424’s thermal foldback circuitry reduces the regulated current through the LEDs. The reduced current dims the LED to a range programmed by the designer and the LED remains within the range until it returns to a safe operating temperature. The firm’s Webench LED Designer software helps lighting designers identify the ideal temperature threshold or foldback breakpoint of the LEDs, eliminating hand calculation of resistor values. Offered in a 20-pin thermally-enhanced TSSOP package, the LM3424 drives up to 18 high-brightness LEDs in series with output current above 2 A in a typical application. It contains all of the features to regulate currents based on buck, boost, SEPIC, flyback and buck-boost topologies. Available now, the LM3424 LED driver costs $1.75 each in lots of 1000. NATIONAL SEMICONDUCTOR, Santa Clara, CA. (408) 721-5000.


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TAGS: Components
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