Automotive LED generates virtually constant light output even at high temperatures

September 20, 2012 // By Christoph Hammerschmidt
Osram Opto Semiconductors has introduced a new LED for automotive frontlighting systems. Equipped with state-of-the-art packaging technology and a ceramic converter, this LED offers high light output even at high currents, uniform distribution of light and thermal stability. Oslon Black Flat had its premier as a prototype at ISAL 2011 and is available now.

Light sources for frontlighting have to be multitalented. Not only do they have to illuminate the road ahead reliably in rain and fog and at night, they have to perform various functions as low beam, cornering lights and fog lights for example. At the same time, they have to withstand high temperatures in the headlights. For these reasons more and more automobile manufacturers are opting for the flexible, efficient and powerful LED technology. Oslon Black Flat is the latest addition by Osram Opto Semiconductors to its Oslon Black series and has been designed to meet all these requirements.

The new LED contains a UX:3 chip that delivers high light output even at high currents. With a power draw of 2.3 W and an operating current of 700 mA, the Oslon Black Flat achieves a typical luminous flux of 200 lm (at 25°C). If operated at 1.2 A it can achieve up to 270 lumens – despite an operating temperature of 100°C in the chip.

Properties such as higher thermal stability of the luminous flux eeven under “hot” application conditions and to a new temperature-optimized packaging process facilitate thermal management. The typical thermal resistance has been reduced to 4 K/W. The thermal coefficient of expansion of the black QFN package (Quad Flat No Leads) of the Oslon Black Flat LED is matched to the coefficient of expansion of the metal core board. All these properties make the Oslon Black Flat particularly stable and extremely durable (more than 100,000 hours at 700 mA and a chip temperature of 60°C).

The Oslon Black has been designed to function without a lens; its light can therefore be injected very close to light guides or lenses for innovative lighting designs. This feature also enables car designers to separate the LED and the associated electronics from the headlight assembly and put them to places tat better suit the needs for heat management and servicing.

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