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LX1691B Datasheet

Enhanced Multi-Mode CCFL Controller

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TM
LX1691B
® Enhanced Multi-Mode CCFL Controller
PRELIMINARY DATA SHEET
DESCRIPTION
The LX1691B is an enhanced Direct
Drive CCFL (Cold Cathode Fluorescent
Lamp) Controller. Its architecture is based on
the LX1691. The LX1961B is optimized for
wide input voltage applications. It is similar
to the LX1691 except it has a guaranteed
minimum lamp strike interval of one second1
to meet notebook and monitor panel
manufacturer’s specifications. The “B”
version also adds feed forward input voltage
sensing to enhance transient response when
used in inverters that derive lamp power
from unregulated input supplies and
batteries.
The LX1691B can also be used with
fixed input supplies where it produces
performance equal to the LX1691.
LX1691B 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 lamp current amplitude
and duty cycle simultaneously or separately.
Designers can select normal or reverse
polarity dimming and precisely program
minimum and maximum lamp currents with
resistors. Fault protection includes open
lamp voltage regulation and shutdown for
over voltage and over current conditions.
The LX1691B employs Microsemi’s 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 LX1691B’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.
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 Wide Input Voltage Capable
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
BENEFITS
ƒ Low Component Count /
Module Cost / And Size
ƒ High “Nits/Watt” Efficiency
ƒ Can Operate 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
0
T1
T2 DD_CLK
Internal Digital
2 BRITE_IN
+3V
0
T
DD_CLK
T = 256 / Lamp Frequency
_
T1 T2
Lamp Current (mA)
+
0
T
DD_CLK
T = 512 / DD_CLK Frequency
Direct PWM (Analog)
2 BRITE_IN
_
T
0
T1
T2 DD_CLK
Four of Six Dimming Modes
_
T
Lamp Current (mA)+
_
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
LX1691BIPW
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1691BIPW-TR)
1 If the lamp frequency is less than 115Khz.
Copyright © 2005
Rev. 0.4a, 3/8/2005
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1


  Microsemi Electronic Components Datasheet  

LX1691B 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 LX1691B
Description Enhanced Multi-Mode CCFL Controller
Maker Microsemi Corporation
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