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Optoelectronics/Displays??

White LED driver shines in notebook LCD displays

Posted: 23 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:white LED? notebook? LCD?

Texas Instruments Inc. introduces a six-channel, 40V white LED driver with a built-in, high-efficiency boost regulator and 1.5A FET. The smallest LED driver to manage up to 60 white LEDs at once, the TPS61181 provides high power efficiency and accurate current regulation for medium-sized displays used in notebooks, portable GPS, industrial and medical applications.

The TPS61181 offers enhanced pulse-width modulation (PWM) brightness dimming control for a 100:1 brightness range. Featuring two patented technologies, the device is designed to minimize any potential audible noise or output AC ripple across a wide dimming duty cycle and frequency range, according to TI. Key features include: 5-24V input voltage; 1MHz switching frequency (a TPS61182 version provides 1.3MHz); boost output auto-adaptive to white LED voltages; six-current sink of 25mA; less than 2.5 percent current matching and three percent accuracy; over-voltage protection; white LED open/short protection; and input and output isolation during short-circuit and shutdown conditions.

The integrated device, which comes in a 0.8mm x 3mm x 3mm QFN package is available now. The suggested resale price is $1.75 for 1,000-unit quantities. A TPS61181EVM-259 evaluation module is also available and suggested resale price is $49.





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