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LX1691A Datasheet, PDF (1/2 Pages) Microsemi Corporation – Enhanced Multi-Mode CCFL Controller | |||
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LX1691A
TM
®
Enhanced Multi-Mode CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
Mircrosemiâs LX1691A is an
enhanced Direct Drive CCFL (Cold
Cathode Fluorescent Lamp) Controller.
Its architecture is based on the LX1691.
LX1691A based inverter modules can
be designed for virtually any CCFL
appliance from digital cameras and
PDAâs to big screen monitors and driver
viewable automotive displays.
New versatile dimming circuitry can
accept digital and analog control inputs
and provides six different dimming
modes that control both lamp current
amplitude and duty cycle, either simul-
taneously or separately. Designers can
select normal or reverse polarity dimming
and precisely program mini-mum and
maximum lamp currents with resistors.
The LX1691A fault shutdown feature
is enhanced to include regulation and
shutdown for over voltage and over
current conditions.
The LX1691A includes the Microsemi
proven and patented strike method that
allows significant efficiency gains while
guaranteeing strong striking power at all
operating temperatures.
Our method sweeps strike frequency
smoothly up to the unloaded resonant
frequency of the lamp and high voltage
transformer. This, coupled with the
LX1691Aâs active high output voltage
regulation, produces just enough strike
voltage without generating unpredictable
high voltage spikes that cause arcing and
component failures. Competitive devices
that simply switch to a higher frequency
for striking do not have this âreal timeâ
control over output voltage, and require
much more attention to transformer
design.
The LX1691A is optimized for wide
input voltage applications. It is identical
to the LX1691 except it has a guaranteed
minimum lamp strike interval of one
second to meet notebook and monitor
panel manufacturerâs specifications. The
LX1691A includes feed forward
compensation that provides improved
regulation and transient response over an
7 â 24 volt input supply range. The
LX1691A can also be used with a fixed
input supply and will produce
performance equal to that of the
LX1691.
IMPORTANT: For the most current data, consult MICROSEMIâs 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
 Simultaneous Amplitude And
Duty Cycle Dimming Modes
 Resistor programmable min and
max lamp currents
 Digital Dimming Can Synch To
External Or Internal Clocks
 120 ms Power On Delay
 Open Or Shorted Lamp
Regulation & Shutdown
 âOn Chipâ Full Wave Lamp
Current Rectifier
 16 Pin TSSOP Package
 Very Stable Oscillator with On-
Chip timing capacitor
 Enhanced Digital Dimming
Resolution
 Wide Input Voltage Capable
BENEFITS
 Low Component Count / Module
Cost / And Size
 High âNits/Wattâ Efficiency
 Operates Directly From a Single
Li-Ion Cell
 Industries Safest And Highest
Performing Strike Voltage
Generation (Patented)
 Tight Operating Frequency
Tolerance For Easier System
Level RFI Control
Traditional Analog
2
BRITE_IN
PRODUCT HIGHLIGHT
Lamp Current (mA)
+
External Digital
2
BRITE_IN
Lamp Current (mA)
+
+3V
0
T1
T2 DD_CLK
Internal Digital
2
BRITE_IN
+3V
0
T
DD_CLK
T = 512 / Lamp Frequency
_
T1
T2
Lamp Current (mA)+
0
T
DD_CLK
T = 512 / DD_CLK Frequency
Direct PWM (Analog)
2
BRITE_IN
_
T
Lamp Current (mA)+
_
0
T1
T
T2 DD_CLK
_
T1
T2
Four of Six Dimming Modes
PACKAGE ORDER INFO
TA (°C)
-40 to +85
MIN VDDP
2.8V
MAX VDDP
5.5V
Plastic TSSOP
PW 16-PIN
RoHS Compliant / Pb-free
LX1691AIPW
Note: Available in Tape & Reel. Append the letters âTRâ to the part number. (i.e. LX1691AIPW-TR)
Copyright © 2003
Rev. 1.1b, 8/30/2006
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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