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AnalogicTech forays into LED backlit LCD TV market

Posted: 25 Nov 2009     Print Version  Bookmark and Share

Keywords:LED driver  backlight  LCD TV 

For backlighting, the AAT2405 (6-channel), edge lighting driver can be paired with the AAT2404 high voltage boost controller to deliver a configurable solution for Edge LCD backlighting. With simple adjustable phase delay, the AAT2405 can be configured as a 2-, 3-, 4- or 6-channeldriver, dependant on the number of LED strings per light bar. Utilising internal current sensing, the AAT2405 eliminates high tolerance, high cost external sensing resistors. Each output can regulate up to 150mA/channels with ±2.5 per cent accuracy and matching. These devices can be cascaded for multiple LED strings, with communication between the ICs maintaining the correct PWM and Phase information.

Also released for edge applications are the AHK2417E (eight-channel) and AHK2418E (16-channel).This solution is for systems with up to 100mA/channel LED output current with ±2.5 per cent accuracy and matching. The chipset features integrated fault protection for shorted & open circuit LEDs, over-current, over-voltage and over-temperature protection with fault reporting via the SPI bus.

AnalogicTech's boost controller, the AAT2404, is a DC/DC boost controller IC which can operate from a 12V or 24V input supply and boosts the voltage dependent upon the number of LEDs in the string. Integrating a high speed, low impedance gate driver IC, the AAT2404 uses externally connected MOSFETs to provide up to 3.2A of output current. The AAT2404 directly connects to the current sink feedback pin of the LED backlight drivers to provide the correct string voltage.

In addition to the new LED backlight drivers, AnalogicTech outlined plans to deliver a total power management solution for TVs including, for example, enhancements to AnalogicTech's existing Class D audio power amplifier products. Product development is underway and products will be rolled out over the next several months.

"Adoption of these new technologies will be driven by three key factors: Environmental mandates to eliminate the mercury CCFLs used in today's backlighting, the continued price reduction of white LEDs bringing the cost of LED backlighting to parity with CCFLs, and the consumers' desire for a better viewing experience," stated Phil Dewsbury, product line director, display and lighting products. "With the products announced today and the pipeline of enhancements, we have the best system solution for the TV market to deliver on the promise of power conservation and enhanced user-experience."

The AAT2400/01 and AAT2402M/S direct/matrix driver chipsets, the AAT2403 dedicated direct/matrix driver and AAT2405 and AHK2417/18 edge drivers as well as the AAT2404 DC/DC boost controller are all available for design-in.

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