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LX1692B Datasheet

  • LX1692B

  • Microsemi Corporation [Full Bridge Resonant CCFL Controller...

  • MICROSEMI

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LX1692B
TM
廬
Full Bridge Resonant CCFL Controller
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
Microsemi鈥檚 LX1692B is a cost
reduced, third generation 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 LX1692B 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 LX1692B 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 LX1692B can accept a
brightness control signal that is either
an analog voltage or a low frequency
PWM.
The
LX1692B
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 LX1692B is available in a 20-
Pin TSSOP and SOIC.
For Wide Voltage Range Inverter
Application (7V to 22V)
Low Stress to Transformers
Wide Dimming Range
Analog Dimming: >3 to 1
Digital Dimming : >20 to 1
Combined: >60 to 1
Programmable Burst Dimming
Frequency
Programmable Time Out
Protection
Fixed Operating Frequency
Open Lamp Voltage Protection,
Short Lamp Protection, Arc
Protection
1
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
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
APPLICATIONS
LCD TV
LCD Monitor
V
SUPPLY
LX1692B
C_R
I_R
C_BST
C_TO
A
B
C
D
ISNS
DUAL
FET
Part
DUAL
FET
BRITE_IN
EA_OUT
Balancer
LX1692B
LX1692B
PACKAGE ORDER INFO
T
A
(擄C)
-20 to +85
1
PW
Plastic TSSOP
20-Pin
LX1692BIPW
DW
Plastic SOIC
20-Pin
LX1692BIDW
RoHS Compliant / Pb-free
RoHS Compliant / Pb-free
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number. (i.e. LX1692BIPW-TR)
Arc protection is provided if the arcing level is enough to be trigged.
Copyright
漏
2005
Rev. 1.1, 12/20/2006
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

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