LX1696A
TM
廬
Full Bridge Resonant CCFL Controller
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
Microsemi鈥檚 LX1696A is a full bridge
resonant controller designed specifically
for Automotive and high performance
display applications. The Direct Drive
CCFL (Cold Cathode Fluorescent Lamp)
controller is optimized to provide the
functions, efficiency, and safety features
critical to vehicular applications while
providing major advancements in overall
component count and costs at the system
level.
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 architecture also provides a wide
dimming range.
The LX1696A includes safety features
that limit the transformer secondary
voltage and protect against fault conditions
which include open lamp, broken lamp,
and short-circuit faults.
In addition to this protection the
LX1696A provides integrated fault indicator
and shutdown features necessary in
automotive environments. Integration of
these
functions
provides
significant
reductions in required external support
components.
The LX1696A 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 as well as
optimizing the display performance in
temperature extremes.
The LX1696A can accept a brightness
control signal that is either an analog
voltage
1
or a direct low frequency PWM.
The LX1696A also features integrated
gate drivers for the four external power
MOSFETs.
An integrated 4V LDO powers all
internal control circuitry greatly simplifying
supply voltage requirements.
The LX1696A is available in a 20-Pin
TSSOP in extended temperature range.
KEY FEATURES
For Wide Voltage Range Inverter
Application (7V to 22V)
Patent Resonant Lamp Strike for
Unsurpassed Striking Power
Combined with Best Efficiency
Reduced Corona Stress To
Transformers
Wide Dimming Range
鈥?/div>
Direct Low PWM Brightness Control
Input Provides > 300:1 Capability
鈥?/div>
DC Brightness Control Input
Provides > 80:1 capability
Programmable Burst Dimming
Frequency
Programmable Time Out Protection
Fixed Operating Frequency
Open Lamp Voltage Protection,
Short Lamp Protection, Arc
2
Protection
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
Automotive
Industrial Application
Avionics
Marine
WWW .
Microsemi
.C
OM
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
PACKAGE ORDER INFO
LX1696A
LX1696A
T
A
(擄C)
-40 to +85
PW
Plastic TSSOP
20-Pin
LX1696AIPW
RoHS Compliant / Pb-free
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?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
漏
2004
Rev. 1.0, 2006-03-29
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1
2
