lx1691b Microsemi Corporation, lx1691b Datasheet

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lx1691b

Manufacturer Part Number
lx1691b
Description
Enhanced Multi-mode Ccfl Controller
Manufacturer
Microsemi Corporation
Datasheet

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Part Number
Manufacturer
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Part Number:
lx1691bIPW
Manufacturer:
MICROSEM
Quantity:
1 033
Part Number:
lx1691bIPW
Manufacturer:
MSC
Quantity:
20 000
Part Number:
lx1691bIPW-TR
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Quantity:
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1
If the lamp frequency is less than 115Khz.
Copyright © 2005
Rev. 1.0a, 8/30/2006
Drive CCFL (Cold Cathode Fluorescent
Lamp) Controller. Its architecture is based on
the LX1691. The LX1691B is optimized for
wide input voltage applications. It is similar
to the LX1691 except it has a guaranteed
minimum lamp strike interval of one second
to meet notebook and monitor panel
manufacturer’s specifications.
version also adds feed forward input voltage
sensing to enhance transient response when
used in inverters that derive lamp power
from
batteries.
fixed input supplies where it produces
performance equal to the LX1691.
designed for virtually any CCFL appliance
from digital cameras and PDA’s to big
screen
automotive displays.
accept digital and analog control inputs and
provides six different dimming modes that
IMPORTANT: For the most current data, consult MICROSEMI’s website:
Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; Patents Pending
The LX1691B is an enhanced Direct
The LX1691B can also be used with
LX1691B based inverter modules can be
New versatile dimming circuitry can
unregulated
monitors
TM
Traditional Analog
Internal Digital
and
input
2
0
2
0
T1
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
T = 256 / Lamp Frequency
driver
T
-40 to +85
supplies
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1691BIPW-TR)
T
T2
A
D E S C R I P T I O N
BRITE_IN
BRITE_IN
The “B”
(°C)
viewable
DD_CLK
DD_CLK
+3V
+3V
and
1
Four of Six Dimming Modes
control lamp current amplitude and duty
cycle
Designers can select normal or reverse
polarity dimming and precisely program
minimum and maximum lamp currents with
resistors.
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
guaranteeing strong striking power at all
operating temperatures.
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
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.
P R O D U C T H I G H L I G H T
T1
Lamp Current (mA)
Lamp Current (mA)
M
P A C K A G E O R D E R I N F O
IN
2.8V
simultaneously
voltage
Integrated Products
V
http://www.microsemi.com
®
T
Microsemi
Fault protection includes open
DDP
efficiency
T2
+
+
_
_
without
External Digital
Direct PWM (Analog)
Enhanced Multi-Mode CCFL Controller
2
0
2
0
M
T1
or
AX
5.5V
gains
Our method
T
V
T = 512 / DD_CLK Frequency
separately.
generating
DDP
T2
BRITE_IN
BRITE_IN
P
while
DD_CLK
DD_CLK
RODUCTION
PW
RoHS compliant / Pb-free
LX1691BIPW
Plastic TSSOP
16-PIN
T1
D
Lamp Current (mA)
Lamp Current (mA)
ATA
Low Component Count /
Module Cost / And Size
High “Nits/Watt” Efficiency
Can Operate 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
Wide Input Voltage Capable
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
“On Chip” Full Wave Lamp
Current Rectifier
16 Pin TSSOP Package
Very Stable Oscillator with On-
Chip Timing Capacitor
Enhanced Digital Dimming
Resolution
K E Y F E A T U R E S
T
S
B E N E F I T S
HEET
T2
+
_
+
_
LX1691B
Page 1

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