LED controller offers more than 86% efficiency

Linear Technology Corp. announces the LT3799, an isolated LED controller with active power factor correction (PFC), specifically designed for driving LEDs from a universal input range of 90 to 265 Vac. The LT3799 is optimized for LED applications requiring 4 to more than 100 W of LED power and is also compatible with standard TRIAC in-wall dimmers.

The LT3799's current sensing scheme delivers a well regulated current to the secondary side without using an opto-coupler. This not only reduces cost, but also improves reliability. Its single stage PFC regulator design requires minimal external components. Additionally, its thermally enhanced MSOP-16E package ensures a simple and compact solution footprint for off-line LED applications.

The LT3799 offers more than 86% efficiency, eliminating the need for external heat sinking of the LED driver IC in most applications. Special internal circuitry provides active PFC of up to 0.977, easily meeting industrial Department of Energy (DOE) requirements while also complying with the IEC 61000-3-2 Class C Lighting Equipment Harmonics requirement. The LT3799 can be used with a standard in-wall TRIAC dimmer without any visible flicker. Open and shorted LED protection ensures long-term reliability for a wide range of LED applications.

The LT3799EMSE is available in a thermally enhanced 
16-pin MSOP package. An extended temperature version, or "I" grade, the LT3799IMSE is also available from stock.

For more information, contact Linear Technology Corp., 1630 McCarthy Blvd., Milpitas, CA 95035. Phone: (408) 432-1900.

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