LX1696A Datasheet, PDF (1/2 Pages) Microsemi Corporation – Full Bridge Resonant CCFL Controller

LX1696A
TM
®
Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
Microsemi’s LX1696A is a full bridge In addition to this protection the
resonant controller designed specifically LX1696A provides integrated fault indicator
for Automotive and high performance and shutdown features necessary in
display applications. The Direct Drive automotive environments. Integration of
CCFL (Cold Cathode Fluorescent Lamp) these functions provides significant
controller is optimized to provide the reductions in required external support
functions, efficiency, and safety features components.
critical to vehicular applications while The LX1696A regulates the CCFL
providing major advancements in overall brightness in three ways: analog dimming,
component count and costs at the system digital dimming, or combined analog and
level.
digital dimming methods simultaneously to
Resonant full bridge topology provides achieve the widest dimming range as well as
near sinusoidal waveforms over a wide optimizing the display performance in
supply voltage range in order to maximize temperature extremes.
the life of CCFL lamps, control EMI The LX1696A can accept a brightness
emissions, and maximize efficiency. This control signal that is either an analog
new architecture also provides a wide voltage¹ or a direct low frequency PWM.
dimming range.
The LX1696A also features integrated
The LX1696A includes safety features gate drivers for the four external power
that limit the transformer secondary MOSFETs.
voltage and protect against fault conditions An integrated 4V LDO powers all
which include open lamp, broken lamp, internal control circuitry greatly simplifying
and short-circuit faults.
supply voltage requirements.
The LX1696A is available in a 20-Pin
TSSOP in extended temperature range.
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
KEY FEATURES
ƒ For Wide Voltage Range Inverter
Application (7V to 22V)
ƒ Patent Resonant Lamp Strike for
Unsurpassed Striking Power
Combined with Best Efficiency
ƒ Reduced Corona Stress To
Transformers
ƒ Wide Dimming Range
• Direct Low PWM Brightness Control
Input Provides > 300:1 Capability
• DC Brightness Control Input
Provides > 80:1 capability
ƒ Programmable Burst Dimming
Frequency
ƒ Programmable Time Out Protection
ƒ Fixed Operating Frequency
ƒ Open Lamp Voltage Protection,
Short Lamp Protection, Arc
Protection²
ƒ Compatible with Existing
Transformers
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 Automotive
ƒ Industrial Application
ƒ Avionics
ƒ Marine
PACKAGE ORDER INFO
T_A (°C)
Plastic TSSOP
PW _20-Pin
RoHS Compliant / Pb-free
-40 to +85
LX1696AIPW
Note: Available in Tape & Reel. Append the letters “TR” to
the part number. (i.e. LX1696AIPW-TR)
1 With Analog DC voltage, it will limit the dimming ratio.
2 Arc protection is provided if the arcing level is enough to be trigged
Copyright © 2004
Rev. 1.0, 2006-03-29
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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