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WLED driver offers flicker-free dimming feature

Posted: 14 Apr 2010 ?? ?Print Version ?Bookmark and Share

Keywords:WLED driver? LED? backlight? LCD?

Micrel Inc. has released the MIC3263 six-channel WLED driver equipped with a highly-versatile dimming control scheme for LED brightness in small LCD panels. The flicker-free dimming control scheme eliminates the need for an external PLL for noise filtering of the PWM signal required to dim the LED current.

The MIC3263 is capable of driving up to 10 WLEDs in series per channel with 3 percent current accuracy from input voltages of 6V to 40V. With its boost current mode control architecture and integrated power switch delivering 90 percent and above efficiency, the MIC3263 can provide constant current with changes in input voltage and output load. The solution's operating frequency is programmable from 400kHz to 1.8MHz which allows flexibility in the design. The LED channel current is programmable from 15mA to 30mA and includes a dedicated PWM dimming pin to adjust the brightness of the LEDs.

In addition, the device features multiple LED dimming options and its 16-logarithmic dimming levels allow the dimming ratio down to 1 percent. The MIC3263 also features an enable pin for micro power shutdown, over temperature protection and an under voltage lockout. The IC also has a wide range of protection features including open and short LED protection, programmable over voltage protection and an over temperature protection.

"Micrel's MIC3263 provides the performance, flexibility and ease-of-use required by LED lighting system designers to meet backlighting challenges," noted Doyle Slack, senior marketing director of analog power, linear and RF at Micrel. "In addition, the part features 16 logarithmic dimming steps, mimicking the way the human eye perceives brightness levels. This allows users to minimize programming steps when compared to industry standard products which offer linear steps."

In addition to enhanced power driving capability/reliability, the MIC3263 comes in a 4mm x 4mm MLF-24L package. The MIC3263 is available in volume quantities, with pricing starting at $2.22 for 1K quantities.

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