LED Driver News

Power-over-Internet is good for lighting...?

Maxim has released a white paper explaining the basics of Power over Ethernet (PoE) to feed and control LED lighting. It suggests 13, 25.5, or 51W is available to power LEDs depending on the category of cable installed and the number of pairs in the cable allocated to power…

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Data over mains for led lighting

‘ready2mains’ is an over-mains dimming scheme from driver maker Tridonic. So – sophisticated dimming can be added despite no modifications to existing wiring. Its TalexxConverter Premium driver have it built in – the 100W one, for example, can dim from 1-100% using ready2mains This unit consumes 150mW standby power – not…

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For very fat leds, a 20A (40A peak) driver chip - and it's agile

  Linear Tech’s LT3744 synchronous buck converter is designed to deliver 20A constantly from 12V, or 40A pulsed – this is 80 or 160W according to the company, so it is assuming 4V Vf. As it is intended for use in projectors, the design allows quick transitions between output current levels…

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RGB lighting shield for Arduino prototyping

For prototyping, Infineon has a RGB LED lighting control shield for Arduino, based around its ARM Cortex-M0 XMC1202 microcontroller. On board is something called a ‘brightness colour control unit’ which “ensures smooth, eye-friendly diming and colour mixing for different topologies in an expandable design, with DALI/DMX or…

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Two pin crowbar protects from open circuit strings

For protecting drivers when an LED goes open circuit, NUD4700 from On Semi is a 2x4mm electronic shunt, claming to clamp to 1V in what looks like less than 100ns, according to the data sheet. As well as protecting the driver, it will keep the rest of a string of…

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NXP dimmable controller for 12Vac LED bulbs

NXP Semiconductors has announced a phase-cut dimmable single-stage controller for LED bulbs using 12Vac power: MR16 AR111, for example. Called SSL3401, it is claimed to work “with over 80% of the most common dimmers-transformers combinations”, and to dim “below 5% of maximum light output in most common…

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More on iWatt's chip for low-cost dimmable LED light bulbs

See this article for more general information. iWatt has put an awful lot of work into dimmer compatibility into its latest ac-dc converter for LED replacement light bulbs. The chip is almost entirely digital, and has no microcontroller. Instead, control is implemented in state-machines, which the firm’s…

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How to design a power efficient LED driver

Choice of LED driver topology can improve the power efficiency of LED backlight systems in mobiles and other battery-powered systems, writes Jan Enenkel of austriamicrosystems  In the latest generation of smartphones, which feature large displays suitable for showing web pages and video, the LED backlight system is one of…

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