Automatic phase shifting white LED driver for LCDs

Automatic phase shifting white LED driver for LCDs

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Advanced Analogic Technologies introduced the AAT1451, a high-efficiency white LED driver for liquid crystal display backlighting applications in portable electronics. The AAT1451 drives up to four LED strings at up to 93 percent efficiency, and extends this efficiency to low LED brightness levels by automatic phase shifting, which further increases battery life.
By eeNews Europe

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The chip uses a 32kHz pulse width modulation operating frequency to ensure silent operation and it has a high switching frequency ranging from 600kHz to 1MHz to allow OEMs to select small passive components resulting in lighter and smaller end products.

The driver operates from a wide 2.7 to 26V input voltage range. It incorporates comprehensive safety features to alert the system controller and take corrective action by disabling shorted and open LED strings to prevent thermal fault conditions. The AAT1451’s proprietary PWM dimming reduces peak currents by as much as 75% and the 256 LED brightness levels support the Android operating system platform and Content Adaptive Brightness Control (CABC) to further increase battery life.

To ensure accurate backlight color temperature and uniform brightness across the entire display, the AAT1451 has four precision current sinks that are programmable up to 30mA per string at +/- 2 percent accuracy with +/- 1.5 percent matching between strings to drive up to 48 white LEDs at 120mA total output current. The chip comes in a TDFN34-16 package rated for operation in the -40 to + 85ºC temperature range.

Get the datasheet at https://analogictech.com/products/product_part.php?PID=361

Visit Advanced Analogic Technologies at www.analogictech.com

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