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  Microsemi Electronic Components Datasheet  

LX1691A Datasheet

Enhanced Multi-Mode CCFL Controller

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TM
LX1691A
® Enhanced Multi-Mode CCFL Controller
PRODUCTION DATA SHEET
DESCRIPTION
Mircrosemi’s 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
PDA’s 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
LX1691A’s 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 “real time”
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 manufacturer’s specifications. The
LX1691A includes feed forward
compensation that provides improved
regulation and transient response over an
7 – 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 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 Simultaneous Amplitude And
Duty Cycle Dimming Modes
ƒ Resistor programmable min and
max lamp currents
ƒ Digital Dimming Can Synch To
External Or Internal Clocks
ƒ 120 ms Power On Delay
ƒ Open Or Shorted Lamp
Regulation & Shutdown
ƒ “On Chip” Full Wave Lamp
Current Rectifier
ƒ 16 Pin TSSOP Package
ƒ Very Stable Oscillator with On-
Chip timing capacitor
ƒ Enhanced Digital Dimming
Resolution
ƒ Wide Input Voltage Capable
BENEFITS
ƒ Low Component Count / Module
Cost / And Size
ƒ High “Nits/Watt” Efficiency
ƒ Operates Directly From a Single
Li-Ion Cell
ƒ Industries Safest And Highest
Performing Strike Voltage
Generation (Patented)
ƒ 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
0T1 T2 DD_CLK
Internal Digital
2 BRITE_IN
+3V
0T
DD_CLK
T = 512 / Lamp Frequency
_
T1 T2
Lamp Current (mA)+
0T
DD_CLK
T = 512 / DD_CLK Frequency
Direct PWM (Analog)
2 BRITE_IN
_
T
Lamp Current (mA)+
_
T
0T1
T2 DD_CLK
Four of Six Dimming Modes
T1
_
T2
PACKAGE ORDER INFO
TA (°C)
MIN VDDP
MAX VDDP
Plastic TSSOP
PW 16-PIN
RoHS Compliant / Pb-free
-40 to +85
2.8V
5.5V
LX1691AIPW
Note: Available in Tape & Reel. Append the letters “TR” 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
Page 1


  Microsemi Electronic Components Datasheet  

LX1691A Datasheet

Enhanced Multi-Mode CCFL Controller

No Preview Available !

www.DataSheet4U.com
TM
®
INFORMATION
Thank you for your interest in Microsemi® IPG products.
The full data sheet for this device contains proprietary information.
To obtain a copy, please contact your local Microsemi sales representative. The
name of your local representative can be obtained at the following link
http://www.microsemi.com/contact/contactfind.asp
or
Contact us directly by sending an email to:
IPGdatasheets@microsemi.com
Be sure to specify the data sheet you are requesting and include your company
name and contact information and or vcard.
We look forward to hearing from you.
Copyright
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570


Part Number LX1691A
Description Enhanced Multi-Mode CCFL Controller
Maker Microsemi Corporation
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