MSL2041

Atmel LED Drivers MSL2041/MSL2042 Low-Cost, Simple 4-String LED Drivers with External Current Sink MOSFETs, 5000:1 Dimming Range and Per String PWM Input Preliminary Datasheet Description The MSL2041 and MSL2042 compact, high-power LED controllers use external current control MOSFETs to sink up to 1A per string, with string current matching of ±0.5%. The MSL2041/2 drive four parallel strings of LEDs with fault detection and management of open circuit and short circuit LEDs. The MSL2041 features four PWM inputs that allow independent frequency, dimming and phasing of each string. The MSL2042 has a single PWM input for frequency and dimming control of all four strings, and automatically phase shifts the string drive signals. An external current sense resistor for each string sets full-scale LED current and is adjustable for all strings equally with an internal 8-bit DAC. The MSL2041/2 adaptively control up to two DC-DC or off-line converters that power the LEDs using Atmel's proprietary efficiency optimizer. The efficiency optimizer minimizes power use while maintaining LED current accuracy. Cascade multiple MSL2041/2s to automatically negotiate the optimum power supply voltage when driving more than four strings from a single power supply. The MSL2041/2 feature fault control for open-circuit LED strings, LED short-circuits and device over-temperature conditions. When an open-circuit or short-circuit condition is detected, the MSL2041/2 turn off the faulty string and pull the o...