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EETE NOV 2015

LED shows twice the brightness from same chip surface area Osram Opto Semiconductors has expanded the portfolio of the Osram Ostar Stage family with the addition of four chips of the high-power LED in red, green, blue and white which can be operated at up to 2.5 A (DC) thanks to improved chip technologies. The improvements lead to twice the output of 30 W (electric) from the same chip and package area compared to the existing version, adding another output class to the product family. The LEDs were developed primarily for use in stage spotlights. Four high-power chips with the latest thinfilm and UX:3 technology in red, green, blue and white are the basis of the improved brightness of the new Osram Ostar Stage. The 1 mm² chips can be operated for the first time at up to 2.5 A providing an output of 30 W, which is twice as high as the existing version. Osram Opto Semiconductors www.osram.com SiO3 silicone lenses solve COB optical issues Khatod Optoelectronic has set itself a goal to solve the optical issues when using COB LEDs, especially for outdoor lighting, leveraging the high flux output of COB LEDs while maintaining beam control with shatterproof protection. The company has come up with a complete portfolio of free form SiO3 silicones lenses optimized for the most popular HB and COB LEDs. The optical lenses are engineering through an exclusive cold injection-moulding process customized by Khatod. Designed for wide area lighting, outdoor and indoor, the lenses can be supplied with different beam angles depending on the application: 3 rotosymmetric, 4 asymmetric, 2 axially symmetric in x, y, measuring 111x110x32mm. Khatod Optoelectronic LED drivers drive two strings of 10 LEDs at 50-mA Linear Technology has introduced a high efficiency, constant current LED driver that can drive two strings of up to 10 LEDs at 50 mA. To ensure constant brightness, each LED string contains an accurate high side current source with ±1.8% current matching. The LT3909’s input voltage range of 2.9 V to 40 V makes it ideal for applications ranging from single/multiple Li-Ion inputs to automotive and industrial applications. The LT3909 offers PWM dimming ratios up to 40,000:1, providing an LED backlighting solution in applications such as automotive and avionic displays subject to a wide range of ambient lighting conditions. The LT3909 delivers up to 36 V of LEDs per string, and its output voltage adapts to any variation in LED VF for optimum efficiency. Linear Technology www.linear.com www.electronics-eetimes.com Electronic Engineering Times Europe November 2015 39


EETE NOV 2015
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