Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting Datasheet Brief
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting General Description The Atmel® LED Driver MSL2100 compact, highpower LED string driver uses external MOSFETs to provide up 1A per string, with current accuracy and matching better than ±1%. The MSL2100 drives eight parallel strings of LEDs, and offers fault detection and management of open and short circuit LEDs. The MSL2100 features a 1MHz I2C serial interface.
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting Key Features • 8-bit PWM String Dimming • ±1% Current Accuracy and Current Balance • Fast, 1MHz I2C/SMBus Interface Supports up to 16 Devices per Bus • Video Frame (VSYNC) and Line (HSYNC) Sync Inputs • 4-Bit Adaptive Power Correction Maximizes Efficiency of up to Three Power Supplies • Sync Loss Detectors Optionally Disable LED Strings • External MOSFETs allow >0.
Quick Start Guide The MSL2100 controls eight strings of series-connected LEDs at up to 1A per string, and up to sixteen devices may share the serial interface. The MSL2100 FET gate drive output is optimized for FETs requiring no more than 10nC of charge. The MSL2100 PWM engine generates the PWM signal that drives the strings or, optionally, accepts an external PWM signal.
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting Table 1.
PWM GSC PHI N/C CGND CGND CGND N/C GND EN VDD VIN Package Pin-out - Atmel LED Driver-MSL2100-TB 48 47 46 45 44 43 42 41 40 39 38 37 FLTB 5 32 G6 FBI1 6 31 S6 FBO1 7 MSL2100-TB 30 D5 FBI2 8 (TOP VIEW) 29 G5 FBO2 9 28 S5 FBI3 10 27 D4 FBO3 11 26 G4 GND 12 25 S4 13 14 15 16 17 18 19 20 21 22 23 24 D3 33 D6 G3 4 S3 AD0 D2 34 S7 G2 3 S2 SDA D1 35 G7 G1 2 S1 SCL D0 36 D7 G0 1 S0 AD1 Figure 1. 48-pin, 6mm x 6mm x 0.85mm QFN (0.
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting Pin Descriptions PIN NAME 1 AD1 I²C slave ID selection inputs AD1 and AD0 select the device I²C slave address. 2 SCL I²C serial clock input SCL is the I²C serial interface clock input. 3 SDA I²C serial data I/O SDA is the I²C serial interface data I/O. 4 AD0 I²C slave ID selection inputs AD0 and AD1 select the device I²C slave address.
PIN NAME DESCRIPTION 39 EN Enable input (active high) Drive EN high to turn on the MSL2100, and drive it low to turn it off. For automatic startup, connect EN to VIN through a 100kΩ resistor. 41, 45 N/C No internal connection. Recommended to leave open. 42, 43, 44 CGND 46 PHI Phase synchronization input Drive PHI with an external signal from 40Hz to 10kHz to synchronize the PWM dimming to the signal at PHI. Connect PHI to GND if unused.
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting Electrical Characteristics (Circuit of Figure 3, VIN = 12V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VIN = 12V, TA = +25°C) PARAMETER CONDITIONS AND NOTES MIN TYP MAX UNIT 10.8 12.0 13.2 V 25.0 32.5 mA 10 20 μA 2.5 2.
PARAMETER CONDITIONS AND NOTES MIN TYP 20 MAX UNIT 22 MHz AC ELECTRICAL CHARACTERISTICS fOSC OSCCTRL = 0x04 (fOSC=20MHz); TA=25°C 18 PHI frequency fPHI (Note 7) 40 10,000 Hz GSC frequency fGSC (Note 7) 5 MHz PWM frequency fPWM PWMDIRECT = PWMEN = 1 20 50,000 Hz PWMDIRECT = PWMEN = 1 0 100 % OSC initial accuracy PWM duty cycle PHI DLL lock cycles PHI Cycles 4 PARAMETER CONDITIONS AND NOTES MIN Bus timeout disabled (Note 1) 0 OSCCTRL = 0x04 (fOSC=20MHz); TA=25°C 27
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting Block Diagram Atmel LED Driver-MSL2100 11
Atmel LED Driver-MSL2100 Typical Application Circuit Figure 3.
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting Detailed Description The MSL2100 is a highly integrated, flexible, multi-string LED driver that uses external MOSFETs to allow high LED string currents and includes power supply control for three supplies to maximize efficiency. The driver optionally connects to a video subsystem to offer easy synchronization for use in LCD TV backlight applications.
Setting LED String Currents The maximum string current, ILED, for each string is set by a resistor, RSn, connected to ground from the source terminal of the external string drive MOSFET. The feedback threshold is 500mV. Determine the resistor value using: R Sn = 0 .5 ohms. I LED , where ILED is in amperes and RSn is in For example, a full-scale LED current of 500mA returns RSn = 1.00Ω.
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting Using Multiple Atmel LED Driver-MSL2100s to Control a Single Power Supply Cascade multiple MSL2100 devices into a chain configuration (Figure 5) with the FBIn of one device connected to the FBOn of the next.
Register Map Summary Control the MSL2100 using the registers in the range 0x00 through 0x57 (Table 3). Two additional registers, 0x90 and 0x91, allow access to, and programming of, the EEPROM. The power-up default values for all control registers are stored within the on-chip EEPROM, and any of these EEPROM values may be changed through the serial interface. Table 3.
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting REGISTER AND ADDRESS PWM0 0x30 to PWM7 0x3F 0x40 GSCMAX PHIMIN 0x41 0x42 0x43 FUNCTION REGISTER DATA D7 D6 D5 D4 0x47 0x50 FBOCTRL1 0x51 GSCMAX[7:0] GSCMAX[15:8] PHIMIN[7:0] - - - - FBO2DAC* FBO3DAC* PHIMIN[15:8] UNUSED Individual string fault monitoring enables FLTEN7 FLTEN6 FLTEN5 FLTEN4 FLTEN3 FLTEN2 FLTEN1 FLTEN0 UNUSED Efficiency Optimizer confi
Register Power-up Defaults Register power-up default values are shown in Table 4. Table 4.
Atmel LED Driver-MSL2100 8-string, High-power, White or RGB LED Drivers for TVs, Monitors, or Intelligent Solid-state Lighting REGISTER NAME ANDADDRESS POWER-UP CONDITION REGIASTERS INITIALIZED FROM EEPROM REGISTER DATA D7 D6 D5 D4 D3 D2 D1 D0 HEX 0x20 0x27 PHDLY0 thru PHDLY7 All string phase delays set to zero processed GSC cycles 0 0 0 0 0 0 0 0 00 0x30 0x37 PWM0 thru PWM7 All strings PWM settings equal 48 processed GSC cycles 0 0 1 1 0 0 0 0 30 0 0 0 0 0 0 0 0
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