The optional microcontroller board and graphical user interface (GUI)
software allow control of the driver board through a personal computer. This
gives access to the internal features of the MSL1061, including fault detection,
digital control of LED current, individual LED string on/off control, and internally
generated PWM dimming.
The compact six-channel LED driver board is intended for evaluation,
prototyping, or production runs. Gerber files and Cadence OrCAD layout files
are available to allow the circuit to be integrated into a larger system for large
production runs.
General Description
The Atmel
®
compact,
6-channel LED driver board is a
complete LED backlight driver
solution using the Atmel LED
Driver-MSL1061 LED driver
for medium-sized LCD panels.
Each channel drives up to 12
series-connected LEDs at up to
30mA per channel. The diver
board is configured to operate
from 3.3V up to 28V. The full-
scale LED current is preset to
15, 20, 25, or 30mA per LED
string, selected by an onboard
switch. Current can be
reduced from full-scale through
the I
2
C serial interface in 16
linear steps. Digital (PWM)
dimming is available through
an external signal or by using
the internal PWM generator via
the serial interface.
Applications
•
LCD Panel LED Backlight Driver
Ordering Information
PART
MSLB9061
DESCRIPTION
Compact, 6-channel LED driver module
2
Atmel LED Driver-MSLB9061
Atmel LED Driver-MSLB9061
LED Driver Module
Compact, 6-channel LED Driver Board with I
2
C Interface
Key Features
•
Drives up to 6 LED Strings
•
Up to 12 LEDs per String
•
Up to 30mA per LED String
•
I²C Serial Interface
•
Fault Detection and Protection
•
3.3 to 28V Input Voltage Range
•
Up to 7.2W Output Power
•
Small Size, 1.95” X 0.73”
•
Four Available I²C Slave Addresses, Switch
Selectable
•
Four Full-scale Current Settings, Switch Selectable
•
Separate Bias and Power Inputs Allows a Variety
Of Configurations
•
1Mhz Switching Frequency
•
Internal Or External PWM Dimming Control
•
Digital Control of LED String Current
•
Individual LED String On/Off Digital Control
•
Short Circuit or Open Circuit LED String Detection
•
Automatic Overvoltage Protection
LED Driver Board
0.73”
(18.55mm)
1.95”
(49.53mm)
Atmel LED Driver-MSLB9061
3
Mechanical Drawing
Figure 1. Atmel
®
LED Driver-MSLB9061 Mechanical Drawing. All Dimensions in Inches.
Connector Pin Descriptions
Table 1. J2 Input Connector Pin Descriptions
PIN NAME
PWR
HVBIAS
LVBIAS
DOUBLE
SDA
SCL
FLTB
EN
PWM
GND
PIN NUMBER
1,2
3
4
5
6
7
8
9
10
11,12
PIN DESCRIPTION
Input power to integrated boost regulator circuit
Input to integrated LDO bias voltage regulator
Input to MSL1061 bias voltage
Input to charge pump doubler bias input
I²C serial data
I²C serial clock
Fault indication output
Enable control input
PWM dimming control input
Ground
Table 2. J3 Output Connector Pin Descriptions
PIN NAME
GND
STR6
STR5
STR4
STR3
STR2
STR1
VLED
PIN NUMBER
1-8
9
10
11
12
13
14
15-20
Ground
LED string 6 cathode connection
LED string 5 cathode connection
LED string 4 cathode connection
LED string 3 cathode connection
LED string 2 cathode connection
LED string 1 cathode connection
LED sting anode output voltage
PIN DESCRIPTION
4
Atmel LED Driver-MSLB9061
Atmel LED Driver-MSLB9061
LED Driver Module
Compact, 6-channel LED Driver Board with I
2
C Interface
Absolute Maximum Ratings
Voltage (With Respect to GND)
STR1-STR6 ............................................................................................................................................................................................. -0.3V to +50V
VLED ............................................................................................................................................................................................................. -0.3V to +40V
PWR, HVBIAS........................................................................................................................................................................................ -0.3V to +36V
BIAS, EN, PWM, SDA, SCL, FLTB ........................................................................................................................................-0.3V to +5.5V
Ambient operating temperature range T
A
= T
MIN
to T
MAX
.................................................................................... -40°C to +50°C
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