High-brightness LED driver

  • 13-Oct-2009 09:19 EDT

National Semiconductor features an LED driver with temperature management control and the addition of an online design environment to support it. Part of the company’s PowerWise product family, the LM3424 drives high-brightness LEDs in a variety of automotive applications. Supported in National’s WEBENCH LED Designer, its temperature management control—thermal foldback—enables lighting designers to quickly and easily design a reliable thermal system using the LM3424. Thermal foldback combats the high temperatures that LEDs can reach as a result of environmental conditions. When LED temperatures rise above an usafe threshold, the lifetime and efficacy of the LED decreases. With the LM3424, 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 LM3424 operates over a wide input range of 4.5 to 75 V.

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