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Optoelectronics/Displays??

Full bridge flourescent backlight controllers suit LCD TVs

Posted: 03 Dec 2007 ?? ?Print Version ?Bookmark and Share

Keywords:fluorescent backlight controllers? LCD TV? full bridge inverter?

NXP has announced its high-voltage, full bridge fluorescent backlight controller IC, the UBA2074, and its low-voltage twin, the UBA2072. The two chips form a new family of full bridge fluorescent backlight controller ICs designed specifically to address the trend toward growing display sizes, and the increased use of high-supply voltage backlight inverter solutions in LCD TV applications.

In response to customer requests, the company will manufacture DC/AC inverter controller ICs to drive CCFL or external electrode fluorescent lamps in LCD backlighting applications to support displays of all sizes.

'Industry's first'
NXP claims the UBA2074 is the industry's first, true high-voltage full bridge inverter controller IC, able to directly drive up to 550V supplied full bridges without the need of external level shifters or gate drive transformer constructions. The ability to drive high voltage full bridge inverter structures meets the current and near future requirements of higher power, high and medium supply voltage full bridge backlight inverter solutions. The IC enables the creation of highly efficient high-power fluorescent backlight inverter designs on LCD TV integrated power boards.

Meanwhile, the UBA2072 is designed to operate over a wide low voltage inverter supply, ranging from 9V to 30V, matching the requirements of larger LCD monitors LIPS structures and classical 24V supplied LCD TV backlight inverters.

The end application of the UBA2074 is full bridge high-voltage and medium-voltage LCD TV fluorescent lamp, CCFL/EEFL, backlight inverters. The UBA2074A, without hard switching protection, is targeted at 60V full bridge, medium-voltage backlight applications. On the other hand, the UBA2074, with hard switching protection, focuses on 155V to 400V full bridge, high-voltage backlight applications. The UBA2072 is very similar to the UBA2074, with the main difference that it has been designed specifically for a low-voltage full bridge application limited to 30V.




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