8-string White and RGB LED Driver - ATMEL Corporation
Description
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Atmel LED Driver-MSL3085
8-string White and RGB LED Driver with Adaptive Power Control, EEPROM, and I2C/SMBus Serial Interface
Datasheet Brief
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Atmel LED Driver-MSL3085
8-string White and RGB LED Driver with Adaptive Power Control, EEPROM, and I2C/SMBus Serial Interface
General Description
The Atmel LED DriverMSL3085 compact, highpower 8 LED strings controller uses external MOSFETs to sink up to 350mA per string, with current accuracy and matching better than ±1.
5%.
The MSL3085 drives eight parallel strings of LEDs, and offers fault detection and management of open and short circuit LEDs.
The MSL3085 features a 1MHz I2C serial interface.
The interface supports video frame-by-frame LED string intensity control for up to eight interconnected devices, allowing active area dimming and phase shifted PWM timing for video displays.
It includes an advanced PWM engine that synchronizes LED timing with the video signal for reduced motion blur and waterfall noise.
The MSL3085 adaptively controls the DC-DC converters that power the LED strings using patented Atmel Adaptive SourcePower™ technology.
These fault monitored efficiency optimizers minimize power use while maintaining LED current accuracy, and allow up to eight interconnected devices to automatically negotiate the optimum power supply voltage.
A unique combination of peak current control and pulse width dimming management offers simple full-screen brightness control, versatile area dimming, and a consistent white point.
LED string current is set for each string using a current sense (FET source) resistor.
LED current is also digitally controlled for all eight LED strings.
Global string drive pulse width is adjusted with an 8-bit global intensity register, and individual string pulse width is modulated with 12-bit control.
The MSL3085 monitors for string open circuit, LED short circuit, loss-of-sync and over temperature faults, and ...
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