8 channel constant current LED driver for micro electronic error diagnosis in Austria

Austria Microelectronics Corporation (austriamicrosystems) recently launched the 8 channel constant current LED driver AS1109. The driver is designed for open circuit and short circuit LED design, with advanced error diagnosis function. AS1109 uses serial data input / output lines for error message reading without the use of additional PCB circuit boards for diagnosing LED errors.

Austria microelectronics company of standard linear marketing director Walter Moshammer said: "with the LED display resolution increases, the market needs more accurate and less LED driver package. In addition, LED detection is becoming more and more important for applications such as security related traffic signs, and more commercial applications such as information display or video wall, which need to optimize maintenance costs. AS1109 uses a small package, can provide superior performance, first-class precision and unique LED error detection capabilities, to meet the current market demand."

AS1109 8 Zener Current port, can provide a constant current for driving the LED forward voltage in the wide range of variation in the. AS1109 output port can withstand voltage of up to 15V. Through an external resistor, the current can be adjusted in the range of 0.5 to 100mA, which provides great flexibility for LED brightness control. The transmission accuracy between AS1109 channel and IC is as high as 2%, and the intensity difference between LED and LED module has basically disappeared, which can further improve the quality of LED display screen.

Another feature of AS1109 LED built-in error detection function. This feature is simple and intuitive, and can be operated even when the driver is working, without switching to an independent detection mode. This makes the software interface easier to use, the detection is also very fast. AS1109 can detect any open circuit, short circuit and overheating. In order to quickly and accurately detect these errors, you can use the serial data output. In addition, the specific location of the LED damage can be read from the detailed error report.

To prevent the occurrence of LED display in the error detection process flashing, Austria microelectronics company also launched a unique model of low current diagnosis. In this mode, the display will use only 0.6mA of the test current in a short time. Therefore, the LED test is not obvious, you can use the function in the normal operation of the driver.

The serial interface 30MHz can ensure the high refresh rate, even for large LED display module. AS1109 applies to -40 C to +85 DEG C temperature between the working environment, is the ideal choice for industrial and outdoor applications. The device uses 16 pin SOIC-150, SSOP-150 and a small, 16 pin QFN (4x4mm) package, the pixel spacing is very small, very suitable for indoor LED display.