Diodes Incorporated — AL58263 LED Driver IC

The AL58263 is a 16-channel constant-current LED driver which provides superior dimming and diagnostics capabilities for high picture quality and reliable operation in LED-backlit displays. 

The AL58263 performs dimming with a 16-bit grayscale adaptive pulse density modulation (APDM) technique. This distinctive APDM technology reduces non-ideal output-current distortion caused by non-symmetric transient responses. It also enhances the display refresh rate by efficiently separating the frame waveform.

A fast 25 MHz data clock serial input supplies up to 55 mA to each string of LEDs. Each channel output current is individually programmable via a digital interface. The output currents are set by one external sensing resistor along with a 6-bit global current control register. The driver supports daisy-chaining of up to 1,440 devices and a maximum of 23,040 LED strings.

The AL58263 built-in diagnostics include LED open and short detection and protection. A log of errors is stored in the image-shift register for the host microcontroller to read.