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
Google locks future wearable IP with smart lens patents
April 16, 2014
Yesterday, 15th of April, US-based Google fans were granted the privilege to exchange $1500 for a ďpairĒ of Google Glass. ...
Porsche connects infotainment to cloud with HTML5
Anglia signs with DEM Manufacturing
RFMW Ltd to distribute Aviacommís transceivers
Sensors, actuators market on 11% CAGR to 2018
Additional conference complements Sensor + Test trade fair
April 15, 2014
As an add-on to the Sensor + Test trade fair later this year in Nuremberg (Germany), the organizer plans to launch the European ...
End of Windows XP boosted 1Q14 PC sales, says Gartner
Global HB LED market set to shine by 2018
Chinese smartphone maker undercuts western companies
- USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation
- Measurement applications across multiple test platforms
- Supplying DC input power to string inverters
- Supplying DC input power for HEV testing
InterviewHeartbleed challenges the Internet of Thing
The Heartbleed security bug is a key example of the fundamental security challenge for the Internet of Things says Green Hills Software as it launches a new security group.
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 XMC1200 lighting application kits, worth 100 Euros each, for EETimes Europe's readers to win.
Each kit combines Infineon’s brightness and colour control XMC1200 CPU board to drive flicker free LED dimming and colour changing, together with a colour LED card and a white LED card.
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.