austriamicrosystems has introduced the AS1121, a 30 V, 40 mA, 16-channel LED driver with 12-bit PWM (pulse width modulation), dot correction and diagnostics.
With a 30 V LED supply voltage, the device reduces the number of external support components and can therefore be used directly with 24 V (or higher) supplies. The IC is designed to meet the needs of high-end LED video walls where excellent picture quality is needed. It can also be used for LED backlight driving in monitors and TVs, or to generate ambient light patterns.
The AS1121 features a 6-bit dot correction feature for full-colour LED displays like stadium displays, outdoor and indoor displays, displays for public transport, street signs and LED video walls. It is a 16-channel, constant current-sink LED driver. Each of the 16 channels can be individually adjusted by a 4096-step greyscale PWM brightness control (equating to 6,8 billion colours) running at 10 MHz as well as by a 64-step constant-current sink for dot correction.
The dot correction circuitry adjusts the typical brightness variation of LEDs on each channel. The greyscale control and dot correction circuitry are accessible via the SPI-compatible serial interface. A single external resistor sets the maximum current value of all 16 channels. An open-LED detection function indicates a broken or disconnected LED at one or more of the outputs. Other features include an over-temperature signal and a power-down pin that can put the IC into a 40 nA standby mode.
The AS1121 provides noise reduction features to make sensitive LED applications easier to build. Also, to prevent high inrush currents, it offers a controlled output delay grouped by four channels. The controlled delay allows the best picture quality to be maintained, even with the shortest PWM cycles, while reducing current peaks that sometimes generate audible noise on capacitors. For extremely EMI sensitive applications the rise and fall times can be programmed at the factory.
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