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参数资料
| 型号： | LXM1621-04 |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, XMA |
| 文件页数： | 8/10页 |
| 文件大小： | 280K |
| 代理商： | LXM1621-04 |
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
Copyright
2000
Rev. 1.0a, 2005-02-07
WWW
.Microse
m
i
.CO
M
RangeMAX
LXM1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
PRODUCTION DATA SHEET
I N T E GRA T ED
PR ODUC T S
HOW THE RANGEMAX WORK S
LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION
Figure 3 – 50% Burst Duty Cycle
Figure 4 – 2% Burst Duty Cycle
Rather than using the traditional dimming technique of
varying lamp current magnitude to adjust light output,
RangeMAX inverters use a fixed lamp current value with a duty
cycle control method.
The lamp current burst width can be modulated from 100%
(continuous lamp current) down to a 2% duty cycle, allowing the
lamp to be dimmed to less than 1% of its full brightness.
As can be seen in Trace 3 of Figure 5 photo at right, careful
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.
Figure 5 – 2% Burst Duty Cycle (Expanded Time Base)
Ramp Gen.
Transformer
Driver
High Voltage
Transformer
Comparator
Ramp
+
-
I
SENSE
V
SENSE
V
BRITE
0.25 -
2.2V
DC
V
SYNC
LA
MP
V
LO
V
HI
LA
M
P
V
LO
V
HI
Figure 6 – RangeMAX Simplified Block Diagram
HIGHLIGHTS
Integrated brightness control circuit includes a DC
voltage to pulse width converter that minimizes system
design work and system noise susceptibility.
This
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.
DD
EE
SS
CC
RR
IIPP
TT
IIOO
NN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LXM1621-XX | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE |
| LXM1622-05-01 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CCFL Inverter Module - Dual Lamp |
| LXM1622-05-02 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CCFL Inverter Module - Dual Lamp |
| LXM1622-05-03 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CCFL Inverter Module - Dual Lamp |
| LXM1622-05-XX | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE |
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