16-Channel Constant Current LED Driver With 16bits Multiplex-PDM Control for Dynamic Scanning System

The MY9268, 16-channel constant current LED driver with 16bits grayscale MPDM (Multiplex Pulse Density Modulation) control, supports dynamic 1/2, 1/4, 1/8 scanning applications. The distinctive MPDM technology enhances the refresh rate of dynamic scanning systems without increasing the frequency of grayscale clock in order to prevent from EMI interference. And the technique of automatic black frame insertion could abate efficiently the influence of blurs caused by the scanning switch.

The device operates over a 3V to 5.5V input voltage range and provides 16 open-drain constant current sinking outputs that are rated to 16V and delivers up to 55mA of high accuracy current to each string of LED. The current at each output is programmable by means of an external current-sensing resistor and could be adjusted by 8bits linear global current control. By this advanced M-PDM approach, the frame refresh rate could be improved up to 10000Hz in dynamic 1/8 scanning systems and 20000Hz in dynamic 1/4 scanning systems when the grayscale clock is 10MHz.

The MY9268’s on-board pass elements minimize the need for external components, while at the same time, providing ±1.5% LED current accuracy. Additional features include a ±0.1% regulated output current capability and 30ns fast output transient response.

The MY9268 is available in a 24-pin SOP/SSOP/TSSOP/QFN package and specified over the -40°C to +85°C ambient temperature range.