32-channel 30-mA buck LED driver offers DOT correction and gray scale dimming
April 06, 2011 // Paul Buckley
Linear Technology has introduced a 32-channel LED driver integrated with a 55 V step-down controller. The LT3746 LED driver powers up to 30 mA of LED current for each channel, which can drive up to 13 V of LEDs in series, making it ideal for applications such as large LED billboards.
Each channel has individual 6-bit dot correction current adjustment and 12-bit gray scale PWM dimming. Combined with a 0.5 µs 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 6 V to 55 V input voltage range makes it ideal for a wide range of input sources found in commercial and industrial designs, typically between 12 V and 48 V. The combination of minimal externals and a 5 mm x 9 mm 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%. 32 individual linear current sinks regulate and modulate individual LED strings, offering a wide range of functionality in a compact solution footprint. The LT3746 performs full diagnostics and protection against open/short LED and overtemperature faults, with the fault status sent via the serial data interface. The 30 MHz 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 5mm x 9mm 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, priced starting at $5.45 each in 1,000-piece quantities. All versions are available from stock.
More information about the LT3746 LED driver at www.linear.com/product/LT3746
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Internet of Things (IoT) manufacturer Ciseco has launched the Raspberry Pi ‘Wireless Inventors Kit’ (RasWIK), featuring 88 pieces to provide everything a Pi owner needs to follow a series of step-by-step projects or to create their own wireless devices, without the need for configuration or even writing code.
RasWIK has been designed to be highly accessible, demystifying the dark art of wireless and enabling anyone with basic computing skills to begin building wireless devices with a Raspberry Pi. You can create anything from a simple traffic light, to a battery monitor, or even a temperature gauge that sends data to the Xively IoT cloud so billions can access the data.This month, Ciseco is giving away twelve Raspberry Pi Wireless Inventors kits, worth £49.99 each for EETimes Europe's readers to win.
And the winners are...
In our previous reader offer, Farsens was giving away five kits for EEtimes Europe readers to evaluate its FenixVortex, Kineo and X1 wireless, battery free sensor tags.
Lucky winners include Mr A. Neil from the UK, Mr. E. Delvaux from Belgium, Mr Lengal from the Czech Republic, Mr H. Bijlsma from the Netherlands, and Mr G. Pfaff from Germany. All should be receiving their packages soon. Lets wish them some interesting findings with their projects.
December 15, 2011 | Texas instruments | 222901974
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