LX1693
TM
廬
High Performance CCFL Controller w/ALS
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
The LX1693 is a high performance
CCFL controller optimized for wide
input voltage range notebook display
back lighting applications.
Its
new
brightness
control
architecture provides versatile support
for ambient light sensor (ALS) control
of panel brightness. It also supports
Intel鈥檚 DPST (Display Power Saving
Technology)
that
adjusts
the
brightness as a function of video
content. The ALS control architecture
is compatible with all Microsemi
visible light sensor products.
The controller鈥檚 digital dimming
mode includes three brightness inputs:
ALS_IN for the light sensor,
BRITE_D
for
brightness
and
BST_SYNC for digital dimming and
synchronization..
Burst frequency can be controlled
either by the on chip burst oscillator or
directly by an external logic signal at
BST_SYNC.
The on chip burst
oscillator can either free run or
synchronize to an external signal.
Digital Dimming duty cycle is
controlled by providing either a DC
voltage or a PWM signal to the
BRITE_D pin. The LX1693 can be
operated directly from the battery
without the need of an external 5V
supply from the system.
The LX1693 power stage includes
direct coupled full bridge high voltage
drivers for the external N-channel high
side and N-channel low side power
FETs.
The LX1693 includes lamp current
and open lamp voltage regulation,
fully programmable lamp frequency and
burst dimming frequency oscillators,
and our patented fool-proof lamp strike
circuitry.
Analog programmable open lamp
strike time-out, over voltage, and short
circuit fault detection are fully
implemented.
The LX1693 is available in the 28 pin 4
x5 MLPQ surface mount package.
7 to 25 Volts Wide Input Voltage
Range
Versatile Support for Ambient Light
Sensor Brightness Control
Resistor Programmable Lamp
Operating Frequency within
鹵4%
Tolerance
Resistor Programmable Burst
Operating Frequency
Support Intel
TM
DPST for System
PWM input
Compatible with Microsemi鈥檚 new
SMBus CCFL controllers
Fully Programmable Open Lamp
and Load Fault Time Outs
On Chip Full Wave Rectifiers for
Lamp Voltage and Current
Cost Effective and Low Parts Count
Inverter Modules
Uses Industry Standard High
Voltage Transformers
APPLICATIONS
Note Book LCD displays
Transportable Computers
Web Tablet LCD displays
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; 7,112,929; Patents Pending
PRODUCT HIGHLIGHT
LX1693
LX1693
PACKAGE ORDER INFO
T
A
(擄C)
-20 to 70
LQ
Plastic MLPQ 4x5mm 28 pin
RoHS Compliant / Pb-free
LX1693CLQ
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number. (i.e. LX1693CLQ-TR)
Copyright
漏
2007
Rev 1.0, 8/1/2007
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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