Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface Datasheet Brief
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface General Description Atmel LED Driver-MSL3162 is a compact, high-power, 16-parallel-string LED driver. It uses internal current control MOSFETs to sink up to 100mA per LED string with better than 3% accuracy and with up to 10 series white LEDs per string, or 160 LEDs per MSL3162.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface Key Features • 100ma Maximum Peak LED String Current • Adaptive Power Correction Optimizes LED Supplies • Multiple MSL3162s Can Share String Supplies • MSL3162s Automatically Negotiate The Lowest Supply Voltage That Maintains Regulation Across All MSL3162s • Better Than ±3% Current Accuracy and Balance • Single Resistor Sets Peak Current For All LED Strings • Individual LED String I
Quick Start Guide The MSL3162 is an LED string driver that drives, monitors, and dims up to 160 white LEDs (up to 10 series and up to 16 parallel) at high efficiency for LCD backlighting and signage applications. This section summarizes the capabilities of the MSL3162 for quick evaluation. How Many LEDS and Drivers? The MSL3162 drives 16 strings of series-connected LEDs. The maximum number of LEDs per string is limited to 10 white LEDs by the 40V maximum string voltage rating.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface Timing, PWM, Intensity Controls and Synchronization The internal PWM dimming is synchronized to the LCD's frame timing through the PHI input (typically VSYNC) and the GSC input (typically HSYNC) to eliminate beating artifacts and maintain high timing accuracy. Suitability for LED backlight architectures is shown in Table 2.
FBO2 FBI2 FBO1 FBI1 VDD VIN EN ILED N/C GND Package Pin-out 40 39 38 37 36 35 34 33 32 31 FBI3 1 30 N/C FBO3 2 29 AD0 CGND 3 28 SDA PHI 4 27 SCL GSC 5 26 AD1 PWM 6 MSL3162-TB STR0 7 (TOP VIEW) STR1 8 23 STR14 STR2 9 22 STR13 STR3 10 21 STR12 25 FLTB 11 12 13 14 15 16 17 18 19 20 STR4 STR5 STR6 STR7 GND CGND STR8 STR9 STR10 STR11 24 STR15 Figure 1. 40-pin, 6mm x 6mm x 0.75mm TQFN (0.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface Package Pin-out Figure 2.
Pin Descriptions Table 3. Pin Descriptions 8 PIN NAME PIN NUMBER FBI1, FBI2, FBI3 37, 39, 1 Efficiency Optimizer feedback inputs When using a common LED voltage over multiple MSL3162s, connect FBIs and FBOs in a chain, with the first FBI grounded and the last FBO controlling the external power source. For standalone operation, connect FBI to GND.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface PIN NAME PIN NUMBER VIN 35 Supply voltage input Connect the 5V ±10% supply to VIN. Bypass VIN to GND with a 10µF or greater ceramic capacitor VDD 36 2.5V internal LDO regulator output VDD is the output of the internal regulator and powers internal logic.
Electrical Characteristics (Circuit of Figure 4, VVIN = 5V, VEN = 5V, default register settings of Table 5, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C) PARAMETER CONDITIONS AND NOTES MIN TYP MAX UNIT 4.5 5 5.5 V DC ELECTRICAL CHARACTERISTICS VIN operating supply voltage VIN operating supply current Run mode; all LED strings driven 7 20 mA VIN shutdown supply current Sleep mode; SDA, SCL, AD0, AD1, PWM, PHI, GSC at GND or VDD 20 25 µA 2.5 2.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface PARAMETER CONDITIONS AND NOTES MIN TYP MAX UNIT 5 MHz GSC frequency 0 High and low time PHI, GSC 40 PWM frequency 20 50000 Hz PWM duty cycle 0.
Block Diagram Figure 3.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface GND GND MSL3162BT 20 19 18 17 16 15 14 13 12 11 GND 30 29 28 27 26 25 24 23 22 21 N/C AD0 SDA SCL AD1 FLTB STR15 STR14 STR13 STR12 STR11 STR10 STR9 STR8 CGND GND STR7 STR6 STR5 STR4 EP 1 2 3 4 5 6 7 8 9 10 GND FBI3 FBO3 CGND PHI GSC PWM STR0 STR1 STR2 STR3 C2 1 F GND N/C ILED EN VIN VDD FBI1 FBO1 FBI2 FBO2 SCL SDA FLTB VSYNC HSYNC PWM ENABLE GND GND RbottomB 35k G
Detailed Description Internal Regulators and Enable Input Setting the Maximum LED String Current Built-in current control MOSFETs capable of withstanding up to 40V provide a compact solution. The Efficiency Optimizer circuit controls the LED voltage generated by an external DC-DC converter to minimize losses on the current control MOSFETs, improving efficiency and reducing driver power dissipation.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface Efficiency Optimizer The Efficiency Optimizer improves power efficiency by adjusting each external LED power supply output voltage to the minimum required by the connected LED strings. It does this by injecting a current from the FBO output into the external LED power source voltage divider (Figure 5), thus lowering the LED supply voltage.
Using Multiple Atmel LED Driver-MSL3162s to Control a Single Power Supply To use multiple MSL3162s to control a single power supply, connect the FBOx output of one MSL3162 to the FBIx input of another MSL3162 to form a chain(Figure 6). The Efficiency Optimizer decides whether the current at the FBIx input is less than what the FBOx output is programmed to. If the FBIx current is less than the programmed current, the FBIx current is transferred to the FBOx output.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface Register Map Summary The MSL3162 are controlled through an I2C interface through 82 registers (Table 4). Internal register addressing autoincrements through the register map. In some cases writing to unused register addresses can cause unintended behavior as shown in Table 4.
Table 4. Atmel LED Driver-MSL3162 Register Map REGISTER ADDRESS HPSCR 0x25 0x26 0x27 0x28 0x29 FRATE 0x2A GINT ISTR0 0x2B 0x30 GSCMAX PHIMIN to ISTR15 0x3F PHDLY0 0x40 PHDLY15 PWM0 PWM15 to to 0x4F 0x50 0x5F E2ADDR 0x90 E2CTRLSTA 0x91 FUNCTION Max osc. cycles per GSC pulse Min GSC pulses over PHI period GSC divider PHI freq.
Atmel LED Driver-MSL3162 16-string, RGB and White LED Drivers with Adaptive Power Control and 1MHz I2C/SMBus Serial Interface Table 5.
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