austriamicrosystems has débuted the AS1123 constant-current, 16-channel LED driver with an on-chip diagnostic read-back function.
It is designed for use in industrial applications, indoor/outdoor public information displays, LED panels and large LED video walls.
Designed with a maximum LED supply voltage of 5,5 V, the device is optimised for LED panels where only a single LED is connected per output. The optimisation of the driver to those low supply voltages allows for up to 50% lower VDS versus existing higher-voltage output drivers. This gives better efficiency, resulting in lower power dissipation. The AS1123 also features integrated diagnostics for over-temperature, open LED and shorted LED conditions. Internal registers store global fault status information as well as the detailed temperature/open LED/shorted LED conditions for future analysis.
The IC also features a low-current diagnostic mode to eliminate display flicker during global fault testing. In this mode, a small test current is applied to the display for a very short time. As a result, LED testing is not visible and can therefore be applied during normal operation. These features make the device well suited for fixed or slow-rolling displays. Other applications include large LED matrix displays, displays in elevators, public transportation and even large displays in stadiums and public areas.
The output current of the AS1123 is adjustable up to 40 mA per channel using an external resistor, and features output current accuracy of ±3% between LEDs and between ICs. This ensures high picture quality and uniform brightness for an LED display, since intensity variations between LEDs and LED modules is minimised.
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