LX1692 Datasheet, PDF (1/15 Pages) Mitsumi Electronics, Corp. – Full Bridge Resonant CCFL Controller

LX1692
TM
®
Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
Microsemi’s LX1692 is a cost The LX1692 regulates the CCFL
reduced, third generation Direct Drive brightness in three ways: analog
CCFL (Cold Cathode Fluorescent dimming, digital dimming, or combined
Lamp) controller. The integrated analog and digital dimming methods
controller is optimized to drive simultaneously to achieve the widest
CCFL’s using resonant full bridge dimming range (> 60 to 1).
inverter topology.
The LX1692 can accept a brightness
Resonant full bridge topology control signal that is either an analog
provides near sinusoidal waveforms voltage or a direct low frequency PWM.
over a wide supply voltage range in The LX1692 also features integrated
order to maximize the life of CCFL gate drivers for the four external power
lamps, control EMI emissions, and MOSFETs.
maximize efficiency. This new archi- An integrated 4V LDO powers all
tecture also provides a wide dimming internal control circuitry which greatly
range.
simplifies supply voltage requirements.
The LX1692 includes safety The LX1692 is available in a 20-Pin
features that limit the transformer TSSOP and SOIC.
secondary voltage and protect against
fault conditions which include open
lamp, broken lamp and short-circuit
faults.
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
PRODUCT HIGHLIGHT
LX1692
C_R
A
I_R
B
C_BST
C
Part
C_TO
D
BRITE_IN
EA_OUT ISNS
V_SUPPLY
DUAL
FET
DUAL
FET
KEY FEATURES
ƒ For Wide Voltage Range Inverter
Application (7V to 22V)
ƒ Patent Resonant Strike for
Unsurpassed Striking Power
Combined with Best Efficiency
ƒ Low Stress to Transformers
ƒ Excellent Open Circuit Voltage
Regulation Reduces Transformer
Breakdown Voltage
Requirements While Striking
Higher Voltage Lamps
ƒ One Inverter for Multiple Panel
Types
ƒ Wide Dimming Range
Analog Dimming: >3 to 1
Digital Dimming : >20 to 1
Combined: >60 to 1
ƒ Fool-Proof Striking
ƒ Programmable Burst Dimming
Frequency
ƒ Programmable Time Out
Protection
ƒ Fixed Operating Frequency
ƒ Open Lamp Voltage Protection,
Short Lamp Protection, Arc
Protection¹
BENEFITS
ƒ Even Display Light Distribution
ƒ Longer Lamp Life with Optimized
Lamp Current Amplitude
ƒ Reduced Operating Voltage
Lowers Corona Discharge and
Prolongs Module Life
ƒ High “Nits / Watt” Efficiency
Makes Less Heat and Brighter
Displays
APPLICATIONS
ƒ LCD TV
ƒ LCD Monitor
T_A (°C)
-20 to +85
PACKAGE ORDER INFO
Plastic TSSOP
PW _20-Pin
Plastic SOIC
DW _20-Pin
RoHS Compliant / Pb-free
RoHS Compliant / Pb-free
LX1692IPW
LX1692IDW
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1692IPW-TR)
1 _{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: [phone]
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