The MSL2166 is a compact, high-power LED string driver that uses external current control MOSFETs to sink up to 350mA per string, with matching better than ??0.8%. The MSL2166 drives 16 parallel strings of LEDs and offers fault detection and management of open- and short-circuit LEDs. The MSL2166 features a 20MHz SPI serial interface, and supports video frame-by-frame LED string intensity control for up to eight interconnected devices, allowing active area dimming and phase-shifted pulse width modulation (PWM) outputs. They also include an advanced PWM engine that synchronizes PWM dimming to the video signal supporting forward, center, reverse and inverse PWM modes for reduced motion blur and waterfall noise.
The MSL2166 adaptively controls the DC-DC converters that power the LED strings. These Efficiency Optimizers minimize power consumption while maintaining LED current accuracy.
A unique combination of LED current control and pulse width dimming management offers simple full-screen brightness control, versatile area dimming and a consistent white point. Full-scale LED regulation current is set for each string using current sense resistors and a 10-bit register that controls global string current. The 12-bit global intensity register controls PWM dimming of all strings, and each string uses a 12-bit register to control individual string PWM dimming. The MSL2166 monitors the LED strings for open-circuit, short-circuit, loss-of-sync and over-temperature faults, and provides a hardware fault output (FLTB) to notify the microcontroller. Detailed fault status and control are available through the serial interface. Additionally, the MSL2166 includes on-chip EEPROMs that allow customizing of the register power-up states via the serial interface.