LX1692A
TM
廬
Full Bridge Resonant CCFL Controller
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
Microsemi鈥檚 LX1692A is a cost
reduced, third generation Direct Drive
CCFL (Cold Cathode Fluorescent
Lamp) controller. The integrated
controller is optimized to drive
CCFL鈥檚 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 LX1692A 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 LX1692A 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 LX1692A can accept a
brightness control signal that is either
an analog voltage or a direct low
frequency PWM.
The
LX1692A
also
features
integrated gate drivers for the four
external power MOSFETs.
An integrated 4V LDO powers all
internal control circuitry greatly
simplifying supply voltage require-
ments.
The LX1692A is available in a 20-
Pin TSSOP.
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; 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
Compatible with Existing
Transformers
BENEFITS
Even Display Light Distribution
Longer Lamp Life with Optimized
Lamp Current Amplitude
Reduced Operating Voltage
Lowers Corona Discharge and
Prolongs Module Life
High 鈥淣its / Watt鈥?Efficiency
Makes Less Heat and Brighter
Displays
APPLICATIONS
Notebook PC
LX1692A
LX1692A
PACKAGE ORDER INFO
T
A
(擄C)
-20 to +85
PW
Plastic TSSOP
20-Pin
LX1692AIPW
RoHS Compliant / Pb-free
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the
part number. (i.e. LX1692AIPW-TR)
1
Arc protection is provided if the arcing level is enough to be trigged.
Copyright
漏
2004
Rev. 1.1, 2/27/2006
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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