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Optoelectronics/Displays  

LED drivers optimise power efficiency

Posted: 30 Jun 2011     Print Version  Bookmark and Share

Keywords:LED drivers  multi-string  lighting markets 

Atmel Corp. launches power-efficient multi-string LED drivers for the backlighting and solid state lighting markets. The combination of Atmel LED drivers with Atmel AVR and ARM-based MCUs offers optimal power efficiency, flexibility networking ability and lower BOM.

These features are said to be ideal for rapidly growing LED applications in direct and edge-lit LCD TVs, PC monitors, industrial, military and avionics displays, as well as general illumination in the commercial, residential, industrial and infrastructure market segments.

The LED drivers incorporate Atmel's patent-pending efficiency optimiser technology that minimises power consumption to the lowest practical level. This technology allows designers to use any DC-to-DC or AC-to-DC converter topology with isolated or non-isolated implementation, while dynamically maintaining the highest system power efficiency by minimising excess voltage across LED strings.

The Atmel drivers enable LCD TVs to achieve an ultra-high 10M:1 dynamic contrast and the lowest motion-blur. The new drivers also provide over 10000:1 pulse-width modulation (PWM) dimming range for PC monitors and industrial displays. In solid state lighting applications, the new LED driver ICs and Atmel microcontrollers allow dynamic white-point setting, colour-mixing and networked lighting with Zigbee, DALI and other standards. Other features include comprehensive fault management, LED ageing and thermal control, and programmability with the on-chip EEPROM and scalability to any number of LED strings with minimal DC-to-DC converters.

The multi-string Atmel LED driver ICs are available in three categories including external MOSFET current sinks for high-power LED lighting and edge backlighting applications; internal MOSFET current sinks for direct backlighting and low-power LED lighting; and with integrated power controller for PC monitors and industrial, medical, military displays.

The Atmel multi-string LED drivers are available now ranging from Rs.111.61 ($2.50) to Rs.223.21 ($5) in 1,000-piece quantities.





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