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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. Advantages are: One cable to each luminaire Click-in RJ-45 connections Two ...

Data over mains for led lighting

Tridonic ready2mains

‘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 bad, but could do better Tridonic. Data is passed ...

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

LT3744 neg buck boost

  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 (see below) – and includes the facility to store ...

RGB lighting shield for Arduino prototyping

Infineon Arduino RGB led lighting shield

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 Radar, for example”, said Infineon. 1 dimming engine and 6 channels are used ...

Two pin crowbar protects from open circuit strings

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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 LEDs functioning. “It provides a current bypass in the case ...

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 practical situations”. “While maximum lamp power depends on the thermal design of the ...

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

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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 engineers refer to as ‘code’ – prototyped on FPGAs during development. “During start-up, ...