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Optoelectronics/Displays??

LED driver features DOT Correction

Posted: 08 Apr 2011 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? DOT correction? LT3746?

Linear Technology introduces the LT3746, a 32-channel LED driver integrated with a 55V step-down controller. The LED driver powers up to 30mA of LED current for each channel, which can drive up to 13V of LEDs in series. The driver is aimed for applications such as large LED billboards. Each channel has individual 6bit dot correction current adjustment and 12bit gray scale PWM dimming. Combined with a 0.5?s minimum LED on-time, the LT3746 offers wide dynamic contrast ratios. Both dot correction and gray scale dimming are accessible via a serial interface in TTL/CMOS logic. The LT3746's 6V to 55V input voltage range makes it ideal for a wide range of input sources found in commercial and industrial designs, typically between 12V and 48V. The combination of minimal externals and a 5x9mm QFN package provide a highly compact solution footprint for multichannel LED applications.

The LT3746's internal buck controller generates an adaptive bus voltage slightly higher than the parallel LED strings to deliver efficiencies over 90 percent. 32 individual linear current sinks regulate and modulate individual LED strings, offering a wide range of functionality in a compact solution footprint. The driver performs full diagnostics and protection against open/short LED and overtemperature faults, with the fault status sent via the serial data interface. The 30MHz fully buffered, skew-balanced, cascadable serial interface makes the LT3746 ideal for large screen LCD dynamic backlighting as well as full color LED displays.

The LT3746EUHH is available in a 56-lead 5x9mm QFN package priced starting at $4.95 each, in 1,000-piece quantities. The extended temperature version, the LT3746IUHH or I-grade, is also available and priced starting at $5.45 each in 1,000-piece quantities. All versions are available from stock.





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