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 MSL3162, including fault detection,
digital control of LED current, individual LED string on/off control, and internally
generated PWM dimming.
The compact eight-channel LED driver board is intended for evaluation,
prototyping, or small 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,
8-channel LED driver board
is a complete LED backlight
driver solution using the Atmel
LED Driver-MSL3162 for
medium-sized LCD panels.
Each channel drives up to 10
series-connected LEDs at up
to 160mA per channel. The
driver board is configured to
operate from a 10 - 16V input
voltage. The full-scale LED
current is preset to 50, 60,
70, or 80mA per LED string,
selected by an onboard switch.
Current can be reduced from
full scale through the I
2
C serial
interface in 64 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
MSLB9082
DESCRIPTION
Compact, 8-channel LED driver module
2
Atmel LED Driver-MSLB9082
Atmel LED Driver-MSLB9082
LED Backlight Driver Module
Compact, 8-channel, 20W LED Driver Board with I
2
C Interface
Key Features
•
Drives Up to 8LED Strings
•
Up to 10 LEDs per String
•
Up to 160mA per LED string
•
Internally Generated PWM Dimming
•
I²C Serial Interface
•
Fault Detection and Protection
•
10 To 16V Input Voltage Range
•
Up To 20W Output Power
•
Small Size, 1.0” X 2.0”
•
Four Available I²C Slave Addresses, Switch Selectable
•
Four Full-scale Current Settings, Switch Selectable
•
Four Available Voltage Ranges To Support Multiple
Panels
•
1.4mhz 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 Over-voltage Protection
LED Driver Board
1.0”
(25.4mm)
2.0”
(50.8mm)
Atmel LED Driver-MSLB9082
3
Mechanical Drawing
Figure 1. Atmel LED Driver-MSLB9082 Mechanical Drawing. All Dimensions in Inches.
Connector Pin Descriptions
Table 1. J2 Input Connector Pin Descriptions
PIN NAME
PWR
NC
NC
NC
SDA
SCL
FLTB
EN
PWM
GND
PIN NUMBER
1,2
3
4
5
6
7
8
9
10
11,12
No connection
No connection
No connection
I²C serial data
I²C serial clock
Active low fault indication output
Enable control input
PWM dimming control input
Ground
PIN DESCRIPTION
Input power to integrated boost regulator circuit
Table 2. J3 Output Connector Pin Description
s
4
Atmel LED Driver-MSLB9082
Atmel LED Driver-MSLB9082
LED Backlight Driver Module
Compact, 8-channel, 20W LED Driver Board with I
2
C Interface
PIN NAME
VLED
STRA
STRB
STRC
STRD
STRE
STRF
STRG
STRH
GND
PIN NUMBER
1-8
9
10
11
12
13
14
15
16
17-20
LED string anode output voltage
LED string A cathode connection (MSL3162 STR0 and STR1)
LED string B cathode connection (MSL3162 STR2 and STR3)
LED string C cathode connection (MSL3162 STR4 and STR5)
LED string D cathode connection (MSL3162 STR6 and STR7)
LED string E cathode connection (MSL3162 STR8 and STR9)
LED string F cathode connection (MSL3162 STR10 and STR11)
LED string G cathode connection (MSL3162 STR12 and STR13)
LED string H cathode connection (MSL3162 STR14 and STR15)
Ground
PIN DESCRIPTION
Absolute Maximum Ratings
Voltage (With Respect to GND)
STR1-STR6 ............................................................................................................................................................................................. -0.3V to +40V
VLED ............................................................................................................................................................................................................. -0.3V to +40V
PWR .............................................................................................................................................................................................................. -0.3V to +25V
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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