LX1697
TM
庐
High Performance CCFL Controller
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
The LX1697 is a high performance
CCFL controller optimized for wide
input voltage range notebook display
back lighting applications.
Its brightness control architecture
supports Intel鈥檚 DPST (Display Power
Saving Technology) that adjusts the
brightness as a function of video
content.
Digital Dimming duty cycle is
controlled by providing either a dc
voltage or a digital PWM signal to the
BRITE_D pin. Burst frequency can
be controlled either by the on chip
burst oscillator or directly by a low
frequency PWM logic signal at
BRITE_D.
The LX1697 includes a built in
5.1V regulator so it can be operated
directly from the battery without the
need of an external 5V supply from
the system. The controller鈥檚 power
stage consists of direct coupled full
bridge high voltage drivers for the
external N-channel high side and N-
channel low side power FETs.
The LX1697 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.
Additional features comprise an enable
input, under-voltage lockout, analog
programmable open lamp strike time-
out, over voltage, and short circuit fault
detection.
The LX1697 can also be used with
Microsemi鈥檚 LX1801 SMBus controller
to provide a completely digital
interfaced backlight control system.
The LX1697 is available in the 24
pin 4x4 mm MLPQ surface mount
package and is specified from -20掳C to
70掳C.
PRODUCT HIGHLIGHT
7 to 25 Volts Wide Input Voltage
Range
Resistor Programmable Lamp
Operating Frequency within
卤3%
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
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
Note Book LCD displays
Transportable Computers
Web Tablet LCD displays
BATTERY VOLTAGE
( 7V 鈥?25V)
VDD
VBAT
VBAT
VBH
BOH
BOL
VBS
VBAT
VDD
ON
OFF
BLIM
ENABLE
BRITE_D
LX1697
PGND
VAH
AOH
AOL
GND
VAS
ISNS
VSNS
DIM_MODE
MIN_BRITE
C_VCO
R_LMP
R_BST
LX1697
LX1697
PACKAGE ORDER INFO
T
A
(掳C)
-20 to 70
LQ
Plastic 24pin MLPQ 4x4mm
RoHS Compliant / Pb-free
LX1697CLQ
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number. (i.e. LX1697CLQ-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
Page 1
1
2
