LMX1622-05-01 Microsemi Corporation, LMX1622-05-01 Datasheet - Page 4

• Manufacturer Part Number: LMX1622-05-01
• Description: DUAL 5W / DIGITAL DIMMING CCFL INVERTER MODULE
• Manufacturer: Microsemi Corporation

Copyright
Rev. 0.5,2001-01-18
A
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 5% duty cycle, allowing the
lamp to be dimmed to less than 3% 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 -
M I C R O S E M I
Rather than using the traditional dimming technique of
The lamp current burst width can be modulated from 100%
As can be seen in Trace 4 of Figure 3 photo at right, careful
V
D C
V
BR IT E
SYN C
2000
R amp
R amp G en.
 


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C omparator
+
-
– RangeMAX Simplified Block Diagram

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
T ransformer
– 50% Burst Duty Cycle
I
D river
SEN SE
V
SEN SE
C O M P A N Y
H igh Voltage
T ransformer
             
              
Linfinity Microelectronics Division

Microsemi
RangeMAX
V
V
V
V
H I
LO
LO
H I
HIGHLIGHTS
D
 !" $
UAL
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.
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. In this synchronous mode,
the inverter burst rate operates at twice the video refresh
rate, well beyond standard 50/60Hz video refresh rates
where the eye can perceive pulsing light.
5W, D
P
RELIMINARY
IGITAL
– 5% Burst Duty Cycle (Expanded Time Base)
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D
IMMING
– 5% Burst Duty Cycle
D
CCFL I
ATA
S
LXM1622-05-xx
NVERTER
HEET
M
ODULE
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