LX1692
TM
®
Full Bridge Resonant CCFL Controller
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
Microsemi’s LX1692 is a cost
reduced, third generation Direct Drive
CCFL (Cold Cathode Fluorescent
Lamp) controller. The integrated
controller is optimized to drive
CCFL’s using resonant full bridge
inverter topology.
Resonant full bridge topology
provides near sinusoidal waveforms
over a wide supply voltage range in
order to maximize the life of CCFL
lamps, control EMI emissions, and
maximize efficiency. This new archi-
tecture also provides a wide dimming
range.
The LX1692 includes safety
features that limit the transformer
secondary voltage and protect against
fault conditions which include open
lamp, broken lamp and short-circuit
faults.
The LX1692 regulates the CCFL
brightness in three ways: analog
dimming, digital dimming, or combined
analog and digital dimming methods
simultaneously to achieve the widest
dimming range (> 60 to 1).
The LX1692 can accept a brightness
control signal that is either an analog
voltage or a direct low frequency PWM.
The LX1692 also features integrated
gate drivers for the four external power
MOSFETs.
An integrated 4V LDO powers all
internal control circuitry which greatly
simplifies supply voltage requirements.
The LX1692 is available in a 20-Pin
TSSOP and SOIC.
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; Patents Pending
For Wide Voltage Range Inverter
Application (7V to 22V)
Patent Resonant Strike for
Unsurpassed Striking Power
Combined with Best Efficiency
Low Stress to Transformers
Excellent Open Circuit Voltage
Regulation Reduces Transformer
Breakdown Voltage
Requirements While Striking
Higher Voltage Lamps
One Inverter for Multiple Panel
Types
Wide Dimming Range
Analog Dimming: >3 to 1
Digital Dimming : >20 to 1
Combined: >60 to 1
Fool-Proof Striking
Programmable Burst Dimming
Frequency
Programmable Time Out
Protection
Fixed Operating Frequency
Open Lamp Voltage Protection,
Short Lamp Protection, Arc
Protection
1
PRODUCT HIGHLIGHT
BENEFITS
Even Display Light Distribution
Longer Lamp Life with Optimized
Lamp Current Amplitude
Reduced Operating Voltage
Lowers Corona Discharge and
Prolongs Module Life
High “Nits / Watt” Efficiency
Makes Less Heat and Brighter
Displays
V
SUPPLY
LX1692
C_R
I_R
C_BST
C_TO
A
B
C
D
ISNS
DUAL
FET
Part
DUAL
FET
BRITE_IN
EA_OUT
Balancer
APPLICATIONS
LCD TV
LCD Monitor
PACKAGE ORDER INFO
LX1692
LX1692
T
A
(°C)
-20 to +85
1
PW
Plastic TSSOP
20-Pin
LX1692IPW
DW
Plastic SOIC
20-Pin
LX1692IDW
RoHS Compliant / Pb-free
RoHS Compliant / Pb-free
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1692IPW-TR)
Arc protection is provided if the arcing level is enough to be trigged.
Copyright
©
2004
Rev. 1.1, 2/9/2006
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
MITSUMI [ MITSUMI ELECTRONICS, CORP. ]
