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Atmel LED Driver-MSL3082

8-string, High-power, White or RGB LED Driver for TV,

Blacklighting, or Intelligent Solid-state Lighting

Datasheet Brief

Summary of content (16 pages)

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Atmel LED Driver-MSL3082 8-string, High-power, White or RGB LED Driver for TV, Blacklighting, or Intelligent Solid-state Lighting Datasheet Brief
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Atmel LED Driver-MSL3082 8-string, High-power, White or RGB LED Driver for TV, Blacklighting, or Intelligent Solid-state Lighting General Description The Atmel® LED DriverMSL3082 compact, highpower LED string driver uses external MOSFETs to provide up to at least 500mA per string, with current accuracy and matching better than ±1%. The MSL3082 drives eight parallel strings of LEDs, and offers fault detection and management of open and short circuit LEDs. The MSL3082 features a 1MHz I2C serial interface.
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Atmel LED Driver-MSL3082 8-string, High-power, White or RGB LED Driver for TV, Blacklighting, or Intelligent Solid-state Lighting Key Features • 8-bit PWM String Dimming • Video Frame (Vsync) and Line (Hsync) Sync Inputs • Fast, 1MHz I C/Smbus Interface Supports up to 16 Devices per Bus • Sync Loss Detectors Optionally Disable Led Strings 2 • 4-bit Adaptive Power Correction Maximizes Efficiency • External Mosfets Allow >0.
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Quick Start Guide The MSL3082 controls eight strings of series-connected LEDs at up to at least 500mA per string, and up to sixteen devices may share the serial interface. The MSL3082 FET gate drive output is optimized for FETs requiring no more than 10nC of charge. The MSL3082 PWM engine generates the PWM signal that drives the strings, or optionally accepts an external PWM signal.
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Table 2.
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Pin Descriptions 6 PIN # NAME DESCRIPTION 1 SCL I²C serial clock Input SCL is the I²C serial interface clock input. 2 SDA I²C serial data I/O SDA is the I²C serial interface data I/O. 3, 44 AD1, AD0 I²C slave ID selection inputs AD0 and AD1 select the device I²C slave address. 4 FLTB Fault output (open drain, active low) FLTB sinks current to GND when the MSL3082 detects a fault. FLTB remains low until the fault registers have been read or EN is toggled low.
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Atmel LED Driver-MSL3082 8-string, High-power, White or RGB LED Driver for TV, Blacklighting, or Intelligent Solid-state Lighting Absolute Maximum Ratings Voltage (With Respect to GND) VIN, EN, D0-D7, G0-G7............................................................................................................................................... -0.3V to +16V SDA, SCL, AD0, AD1, FLTB...........................................................................................................................
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PARAMETER CONDITIONS AND NOTES MIN Input quiescent current EN SDA, FLTB output low voltage TYP MAX UNIT 1 20 μA 0.4 V Sinking 6mA S0 thru S7 regulation resolution % of Full Scale 1 Open circuit detect voltage 7.3 8.3 9.0 V Short circuit detect voltage 6.5 7.8 9.0 V D0 thru D7 leakage current Voltage under 9V 0.
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Atmel LED Driver-MSL3082 8-string, High-power, White or RGB LED Driver for TV, Blacklighting, or Intelligent Solid-state Lighting PARAMETER CONDITIONS AND NOTES MIN TYP MAX UNIT SDA data valid acknowledge time t VD:ACK (Note 2) 0.05 0.55 µs SDA data valid time t V D : D AT (Note 3) 0.05 0.55 µs SDA data set-up time t S U : D AT 100 ns SCL clock low period tLOW 0.5 µs SCL clock high period tHIGH 0.
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Atmel LED Driver-MSL3082 Typical Application Circuit Figure 3. Typical Application Circuit Detailed Description The MSL3082 is a highly integrated, flexible, multi-string LED driver that uses external MOSFETs to allow high LED string currents, and includes power supply control to maximize efficiency. The driver optionally connects to a video subsystem to offer easy synchronization for use in LCD TV backlight applications.
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Atmel LED Driver-MSL3082 8-string, High-power, White or RGB LED Driver for TV, Blacklighting, or Intelligent Solid-state Lighting The device interfaces to an MCU via the I2C/SMBus interface. The robust 1MHz I2C/SMBus interface supports up to sixteen devices on the bus, and is fast enough to support area dimming for 16 interconnected devices.
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Connecting an LED String Power Supply to an Efficiency Optimizer Figure 4. FBO Connection to Power Supply Voltage Divider The MSL3082 is designed to control an external LED string power supply that uses a voltage divider (RTOP and RBOTTOM in Figure 4) to set the output voltage, and whose regulation feedback voltage is not more than 1.5V.
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Atmel LED Driver-MSL3082 8-string, High-power, White or RGB LED Driver for TV, Blacklighting, or Intelligent Solid-state Lighting Figure 5. Cascade Multiple Atmel LED Driver-MSL3082s to Control a Common Power Supply Register Map Summary Control the MSL3082 using the registers in the range 0x00 thru 0x59 (Table 3). Two additional registers, 0x90 and 0x91, allow access to, and programming of, the EEPROM.
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Table 3.
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Atmel LED Driver-MSL3082 8-string, High-power, White or RGB LED Driver for TV, Blacklighting, or Intelligent Solid-state Lighting REGISTER AND ADDRESS FBODAC* 0x59 E2ADDR 0x90 E2CTRLSTA 0x91 FUNCTION Efficiency Optimizer DAC readback REGISTER DATA D7 D6 D5 FBOACT - - D4 D3 D2 - D1 D0 FBODAC[3:0] DO NOT ACCESS ADDRESS RANGE 0X58 TO 0X8F User EEPROM read/write access - E2ADDR[6:0] E2BUSY BLDACT E2ERR - - RWCTRL[1:0] * Read-only registers Register Power-up Defaults Register powe
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REGISTER NAME AND ADDRESS POWER-UP CONDITION REGISTERS INITIALIZED FROM EEPROM 0 .