Datasheet

3Atmel LED Drivers-MSL1061/MSL1064
Atmel LED Drivers-MSL1061/MSL1064
6-string PWM LED Driver with Digitally Compensated, 1.1MHz,
48V Boost Regulator, ±1.5% Current Balance, I
2
C Interface
Key Features
Application Circuit
• Drives 6 Strings of up to 12 LEDs per String
• Drives 72 White LEDs at 30mA for 8W Backlight
• Better than ±1.5% String-to-string Current Accuracy
• 4.75V to 36V Wide Input Supply Range
• Integrated Boost Regulator with 50V Internal Switch
• 1.1MHz Current Mode PWM Boost for Low Noise
• Up to 92% Boost Converter Efficiency
• Internal, Automatic Power Supply Management
• Adjustable LED Current up to 30mA per String
• String Outputs can be Paralleled for >30mA LEDs
• 256:1 Internal PWM Dimming Range Through I
2
C
• 16:1 Internal Analog Dimming Range Through I
2
C
• 12-Bit Total Internal PWM + Analog Dimming Range
• ALS Interface for Automatic Brightness Setting
• NTC Interface for Temperature Derating
• Individual Open-circuit and Short-circuit
Fault Detection
• Faults Automatically Disable the Faulty String
• Fault Reporting and Fault Reset Through I
2
C/SMB
• FLTB Logic Output Indicates Faults
• Enable Input Simplifies Operation Without I
2
C/SMB
• PWM Input Synchronizes PWM to System Clock
and Allows Logic PWM Control Without I
2
C
• Adjustable Over-voltage Protection
• Serial I
2
C/SMB Compatible Interface to 1MHz
• Four selectable I
2
C Slave Addresses (MSL1061)
• GUI Software for Ease of Evaluation
• -40°C - +85°C Operating Temperature Range
• Lead-free, Halogen-free, RoHS-compliant Package
STR0
STR5
…
.
SDA
SCL
AD0
VIN
SW
.
.
.
.
EN
PWM
FLTB
ILED
GND
MSL1061
MSL1064
OSC
I C or
SMBus
Fault
Alert
Set
String
current
1.5% maximum current
mismatch between
Strings
Up to 12
White
LEDs per
String
I C address selection
(MSL1061 only)
ALS or
NTC
V
IN
= 4.75V to 36V
V
OUT
= 48V max
IADJ
OVP