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Microsemi Corporation - Full Bridge Resonant CCFL Controller

Numéro de référence LX1692B
Description Full Bridge Resonant CCFL Controller
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1692B fiche technique
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TM
LX1692B
® Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
Microsemi’s LX1692B is a cost The LX1692B regulates the CCFL
reduced, third generation CCFL (Cold brightness in three ways: analog
Cathode Fluorescent Lamp) controller. dimming, digital dimming, or combined
The integrated controller is optimized analog and digital dimming methods
to drive CCFL’s using resonant full simultaneously to achieve the widest
bridge inverter topology.
dimming range (> 60 to 1).
Resonant full bridge topology The LX1692B can accept a
provides near sinusoidal waveforms brightness control signal that is either
over a wide supply voltage range in an analog voltage or a low frequency
order to maximize the life of CCFL PWM.
lamps, control EMI emissions, and The LX1692B also features
maximize efficiency. This new archi- integrated gate drivers for the four
tecture also provides a wide dimming external power MOSFETs.
range.
An integrated 4V LDO powers all
The LX1692B includes safety internal control circuitry greatly
features that limit the transformer simplifying supply voltage require-
secondary voltage and protect against ments.
fault conditions which include open The LX1692B is available in a 20-
lamp, broken lamp, and short-circuit Pin TSSOP and SOIC.
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; 7,112,929; Patents Pending
PRODUCT HIGHLIGHT
LX1692B
C_R
A
I_R B
CC__BTOSPT art
C
D
BRITE_IN
EA_OUT ISNS
VSUPPLY
DUAL
FET
DUAL
FET
KEY FEATURES
ƒ For Wide Voltage Range Inverter
Application (7V to 22V)
ƒ Low Stress to Transformers
ƒ Wide Dimming Range
Analog Dimming: >3 to 1
Digital Dimming : >20 to 1
Combined: >60 to 1
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
TA (°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
LX1692BIPW
LX1692BIDW
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1692BIPW-TR)
1 Arc protection is provided if the arcing level is enough to be trigged.
Copyright © 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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