LXMG1621-02 Microsemi Analog Mixed Signal Group, LXMG1621-02 Datasheet - Page 7
![MOD INVERTER CCFL DIM DUAL 6MA](/photos/8/1/80140/lxm1621-02_sml.jpg)
LXMG1621-02
Manufacturer Part Number
LXMG1621-02
Description
MOD INVERTER CCFL DIM DUAL 6MA
Manufacturer
Microsemi Analog Mixed Signal Group
Series
LXMG1621r
Type
Inverters for CCFL and UV Lampsr
Datasheet
1.LXMG1621-04.pdf
(10 pages)
Specifications of LXMG1621-02
Voltage - Input
12V
Output
1800V
Size / Dimension
4.88" L x 1.26" W (124mm x 32mm)
Mounting Type
Chassis Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LXM1621-02R
LXM1621-02R
LXM1621-02R
Copyright © 2007
Rev. 1.2, 2010-08-20
varying lamp current magnitude to adjust light output,
RangeMAX inverters use a fixed lamp current value with a duty
cycle control method.
(continuous lamp current) down to a 2% duty cycle, allowing the
lamp to be dimmed to less than 1% of its full brightness.
design consideration was given to controlling lamp start voltage
to softly start current flow. This eliminates current overshoot
that can result in premature cathode wear and reduce lamp life.
LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION
2.2V
0.25 -
Rather than using the traditional dimming technique of
The lamp current burst width can be modulated from 100%
As can be seen in Trace 3 of Figure 5 photo at right, careful
V
DC
V
BRITE
SYNC
Figure 6 – RangeMAX Simplified Block Diagram
TM
Ramp
Ramp Gen.
Figure 3 – 50% Burst Duty Cycle
Comparator
+
-
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Transformer
Driver
I
SENSE
V
SENSE
High Voltage
Transformer
H O W T H E R A N G E M A X W O R K S
Analog Mixed Signal Group
®
Microsemi
RangeMAX™
V
V
V
V
HI
HI
LO
LO
HIGHLIGHTS
D
•
•
•
IGITAL
Figure 5 – 2% Burst Duty Cycle (Expanded Time Base)
Integrated brightness control circuit includes a DC
voltage to pulse width converter that minimizes system
design work and system noise susceptibility.
provides a familiar and convenient interface while
reducing the potential for externally induced noise, which
can cause lamp flicker.
An on-board oscillator operates the inverter BURST rate
about 95Hz, well beyond standard 50/60Hz video refresh
rates where the eye can perceive pulsing light.
RangeMAX inverter modules are designed to operate
with the burst frequency synchronized to the video frame
rate. This provides operation with no visible display
disturbances caused by beat frequencies between the
lamps and video frame rates.
D
IMMING
P
RODUCTION
Figure 4 – 2% Burst Duty Cycle
D
UAL
L
AMP
D
CCFL I
ATA
S
NVERTER
HEET
LXMG1621-xx
M
ODULE
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