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EETE SEPTEMBER 2012

Multi-voltage LED panel indicators for applications in harsh environments The multi-voltage LED panel indicators from Marl International provide universal options for applications in harsh and demanding environments. The standard and customised LED panel lamps include components that have an operating voltage input range from 12V- 48V AC/DC (a true bi-polar product) and 110-240V AC.This wide voltage op- tion is available across a wide range of Marl panel indicators, in all the popular colours including red, green, blue, yellow and clear. Lens options include smoked, diffused or water clear. Most LEDs are specified with a service life of 100,000 hours and can be supplied with full environmental protection including sealing to IP67. They are assembled in robust anodised aluminium housing, and are offered with a range of mounting options to suit the customer’s enclosure. Electrically, Marl LEDs can be supplied with reverse polarity protection, or as fully bipolar components. Terminations available include flying leads, solder tags, screw terminals or solder pins. Marl International www.leds.co.uk Backlight LED drivers run from single cell to improve battery life in tablets and mobile devices Intersil has launched a family of backlight LED drivers that can operate from the low input voltage of a single cell Li-ion battery. The ISL9769x series are 90% ef- ficient with a 3.7V input driving 6-parallel, 5-series LED configuration at 20mA/LED while the 0.8mA supply current and phase shifted PWM dimming improve energy efficiency. With a minimum input voltage of just 2.4V, and quiescent current of only 0.8mA, the new ISL97692/3/4A series of LED drivers makes the most of the limited capacity of Li-Ion batteries in portable devices. The ISL97692 incorporates four channels with up to 40mA each, while the ISL97693 and ISL97694A provide six channels with up to 30mA each. All the drivers feature output current phase shift- ing which maximizes efficiency during PWM dimming and increases the effective output current frequency to eliminate audible noise. Additionally, when operating from a single cell Li-Ion battery, the drivers do not require any input voltage other than the battery, reducing board size and component count. Intersil www.intersil.com Touchless control sensor modules add multifunctional capabilities to LED lighting Touchless sensor modules now available from Rapid Electronics, add multifunctional capabilities to LED lighting, allowing users to switch and dim lighting in response to hand gestures and proximity, without the need for physical contact. Designed by Ger- man green technology specialist Fara, the 1-channel and 2-channel sensors operate by using IR technology up to a distance of 15cm. Passing a hand in front of the module switches lighting on and off; gesturing upwards with the hand performs the dimming function. On the 2 channel sensors, which provide 2PWM, the proximity function allows for differing colours to be mixed and reset according to hand gesture. Colour tem- peratures can be mixed and bespoke shades created. When used in conjunction with LED lighting, the Fara touchless modulesare well suited for health and medical environments, where a sterile atmosphere is a key requirement. They can also operate in bright sunlight and behind glass. No switches are required, and all components can be used independently of each other. The 2xPWM module is supported by a programming adaptor that enables the utilisation of seven different firmware functions such as dimming and colour mixing. Rapid www.rapidonline.com www.electronics-eetimes.com Electronic Engineering Times Europe September 2012 33


EETE SEPTEMBER 2012
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