LX1686IPWT(2003) View Datasheet(PDF) - Microsemi Corporation
Part Name
Description
Manufacturer
LX1686IPWT Datasheet PDF : 8 Pages
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INTEGRATED PRODUCTS
LX1686
Digital Dimming CCFL Controller IC
PRODUCTION DATA SHEET
DESCRIPTION
The LX1686 Backlight Controller Safety and reliability features include
IC provides all the control functions a new dual feedback control loop that
needed to implement Linfinity’s direct permits regulation of maximum lamp
drive inverters used to operate cold strike voltage as well as lamp current.
cathode fluorescent lamps (CCFL’s). Regulating maximum lamp voltage
This IC can be used to control single or permits the designer to provide for
multiple-lamp configurations. CCFL’s ample worst case lamp strike voltage
are used for back or edge lighting of while at the same time conservatively
liquid crystal flat panel displays limit maximum open circuit voltage.
(LCD’s) and typically find application An innovative new strike voltage
in notebook computers, web browsers, generation technique enables the nodule
automotive
and
industrial designer to optimize high voltage
instrumentation, and entertainment transformer design for maximum
systems.
operating efficiency with no power
The LX1686 includes a PWM dissipating overhead to guarantee strike
controlled lamp current burst circuit capability
that can provide a > 100:1 dimming Direct drive topology is a non-
range from a simple zero to 2.5V resonant, oscillator-controlled PWM
potentiometer input. The PWM regulation method. The LX1686 allows
dimming burst rate is easily a wide choice of fixed operating
synchronized to the LCD panel’s frame frequencies to match lamp current
rate to prevent interference from frequency to the lamp’s most efficient
optical beat frequencies.
operating point, and to minimize high
frequency interference.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
5
Standard Analog
4
Dimming Inverter
KEY FEATURES
RangeMAX™ Wide Range
Dimming (>100:1)
Synchronizable to Display Video
Frequency
High Voltage Feedback Loop
Directly Controls Maximum Open
Lamp
Micro-Amp Sleep Mode
User Programmable Fixed
Frequency Operation
Under-Voltage Lockout Feature
With Power-Up Reset
Built-In Soft-Start Feature
Operates With 3.3V or 5V power
Supplies
100mA Output Drive Capability
APPLICATIONS
Notebooks
Instrumentation Display
Desktop Computer Monitors
Low Ambient Light Displays
(used in Aircraft, Automobiles,
and Hand-Held Equipment)
BENEFITS
Extremely High Efficiency From
3.3V to 5V Power Supplies
Lower Cost Than Conventional
Buck / Royer Inverter Topologies
Improved Lamp Strike Capability
Improved Over-Voltage Control
3
LinFinity's
RangeMAX
Light emitted by a CCFL is proportional to the current flowing through it.
2
There are two ways to control the current: by adjusting the amplitude of a
continuous AC current; or, as with RangeMAX technology, by varying the
amount of time a burst of full current is present. RangeMAX technology
1
frees the backlight inverter module designer to operate in a lower
brightness and lower power consumption mode than is possible with
0
conventional amplitude control methods.
0
30
45
60
75
90
105
Light Output (Nits)
Copyright 2000
Rev. 1.0c, 2003-06-20
PACKAGE ORDER INFO
TJ (°C)
Plastic TSSOP
PW
24-PIN
0 to 85
LX1686CPW
-40 to 85
LX1686IPW
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1686CPWT)
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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