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
Endoscopic measurement method allows quieter, more reliable jet engines
December 21, 2014
A team of scientists from German aerospace research centre DLR has developed an optical measurement method that enables direct ...
Pathway to converting sunlight to electricity is indentified
How industrial IoT will drive the MEMS market indirectly
Successful with phones & drones, Parrot ponders farming
Qimonda's late legacy: 28nm FeRAM
Volvo airs cloud-based cyclist protection system
December 19, 2014
The facts are disturbing: 50 percent of all cyclists killed in Europe's traffic have collided with a car. In Germany, the ...
Sony transforms eyewear into smart augmented reality devices
Harman grabs hidden infotainment gem S1nn
Alps Electric puts cash into Qualtre
- New life for Embedded systems in the Internet of Things
- Virtualization and the Internet of Things
- RF/Microwave Instrumentation “S” Series Amplifiers
- Application Guide to RF Coaxial Connectors and Cables
InterviewCEO interview: Bosch's IoT startup is all about the system
Thorsten Mueller, CEO of Bosch Connected Devices and Solutions GmbH (Reutlingen, Germany), has been guiding the latest startup subsidiary of Robert Bosch GmbH since 2013 when he started the initiative ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Arrow Electronics is giving away ten BeMicro Max 10 FPGA evaluation boards together with an integrated USB-Blaster, each package being worth 90 Euros, for EETimes Europe's readers to win.
Designed to get you started with using an FPGA, the BeMicro Max 10 adopts Altera's non-volatile MAX 10 FPGA built on 55-nm flash process.
The MAX 10 FPGAs are claimed to revolutionize...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.