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Power Supply ICs and Controllers
News Release from: austriamicrosystems | Subject: AS1112 LED driver
Edited by the Electronicstalk Editorial
Team on 15 January 2008
LED driver suits large, outdoor displays
The AS1112 full colour LED driver is designed for video displays with fast video action, such as in stadium and sporting event applications.
austriamicrosystems has expanded its LED driver portfolio with the AS1112, a full colour LED driver ideally suited for full colour applications such as LED video displays, LCD TV backlighting, indoor/outdoor full-colour LED displays and large-size stadium displays The AS1112 full colour LED driver offers an integrated PWM of 12bit with 4096 grayscale steps per colour, reaching up to 68 billion colours with RGB
This article was originally published on Electronicstalk on 5 Feb 2008 at 8.00am (UK)
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The integrated 6bit dot correction allows adjusting the output current in 64 steps, compensating for LED luminous mismatch.
With accuracy of +/-4.5% between channels and ICs plus the dot-correction the AS1112 dramatically improves the picture quality of LED displays since variations of intensity between LEDs and LED modules completely disappear.
The AS1112 also offers line regulation of 2.5% and load regulation of 0.5%.
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"Huge volumes of LEDs are required for high-quality LED displays such as big stadium displays, commercially used indoor and outdoor displays and displays for public transportation".
"These top quality displays offer high colour depth and brightness, high frame rates and excellent contrast ratio in order to be used even in bright sunlight".
"Additionally, LED error detection is a very important factor in order to optimise maintenance cost and to guarantee high picture quality", said Walter Moshammer, Director Marketing Standard Linear at austriamicrosystems.
The AS1112 full colour LED driver is designed for video displays with fast video action, such as in stadium and sporting event applications, as it provides a very fast refresh rate capability at 30MHz data transfer rate with no delay.
It can be used in LCD TV backlighting where a dynamic dot-correction scheme is required to generate "tunable" white light.
The AS1112 features sixteen regulated current ports, which provide constant currents for driving LEDs within a wide range of forward voltages.
The AS1112's output ports are guaranteed to endure a maximum voltage of 15V, allowing multiple LEDs to be combined in series to a single pixel to increase brightness.
Currents can be adjusted from 0 to 80mA via an external resistor which provides flexibility in controlling LED brightness.
The AS1112 can detect any open or short-circuit as well as any over-temperature occurrence.
Two temperature thresholds allow detailed thermal surveillance of the system.
For immediate detection of errors a global error pin is available.
Furthermore, a detailed error report can be read out with the exact position of the broken LED.
The AS1112 uses the serial data input/output lines for the detailed error information readback so that no additional PCB tracks are needed for LED error diagnostics.
The 30MHz serial interface of the AS1112 ensures high refresh rates even for huge LED display modules.
The AS1112 offers very low power consumption and a power-down function allows the supply current to be reduced to 40nA in standby mode.
With an operating temperature range from -40C to +85C, the AS1112 is suitable for industrial as well as outdoor applications.
The IC is available in the small size, thermally efficient 32-pin TQFN (5 x 5mm) package, easily handling high output power and allowing a very small pitch between LED pixels.
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