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MSL2041GU Datasheet(PDF) 2 Page - ATMEL Corporation |
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MSL2041GU Datasheet(HTML) 2 Page - ATMEL Corporation |
2 / 20 page 2 Atmel LED Drivers-MSL2041/2042 General Description The Atmel® LED Drivers- MSL2041 and MSL2042 compact, high-power LED string 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 and offer 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, while the MSL2042 offers one PWM input for frequency and dimming control of all four strings, and automatically phase shifts the string drive signals. Peak string currents are set using current sense (FET source) resistors and adjustable with an internal 8-bit DAC. 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 The MSL2041/2 adaptively control up to two DC-DC converters that power the LED strings, using Atmel's Adaptive SourcePower™ technology. These Efficiency Optimizers minimize power use while maintaining LED current accuracy. Multiple MSL2041/2s cascade to automatically negotiate the optimum power supply voltage when driving more than four strings from a single power supply. The MSL2041/2 features fault control for open-circuit strings, LED short- circuits and device over-temperature conditions. When a string open-circuit or LED short-circuit condition is detected, the MSL2041/2 turn off the faulty string and pull the open-drain fault output low. The MSL2041/2 feature stand-alone operation, and the basic circuit requires just one to four external PWM dimming inputs. An I2C serial interface is provided to allow optional control and monitoring of the various fault detection and Adaptive SourcePower parameters, but is not required for operation. The MSL2041/2 are offered in the 32-pin, 300mil SOP package, and operate over the -40°C to +85°C temperature range. Applications • LCD-TVs • PC Monitors • Industrial Displays • General Illumination • Street-lighting • Post-regulated or Offline Powered LED Strings Ordering Information PART NO. PWM INPUTS AUTO-PHASE DELAY PACKAGE MSL2041GU 4 NO 32 pin, 300mil SOP MSL2042GU 1 YES 32 pin, 300mil SOP |
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