參數(shù)資料
型號(hào): LXM1612-05-02
元件分類: 模擬信號(hào)調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, XMA
文件頁(yè)數(shù): 4/5頁(yè)
文件大?。?/td> 118K
代理商: LXM1612-05-02
5V HIGHLY-INTEGRATED, DIGITAL DIMMING CCFL INVERTER MODULE
LXM1612-05-xx
PRODUCT DA T ABOOK 1996/1997
Copyright 1999
Rev. 0.4
7/99
4
P RELIMINAR Y D AT A S HEET
P
P A
A
A TENT
TENT
P
P ENDING
ENDING
RangeMAX
TM
High Voltage
Transformer
I
SENSE
LAMP
V
SENSE
V
BRITE
Transformer
Driver
Ramp
Gen.
Comparator
V
SYNC
Ramp
V
HI
V
LO
0.0V-2.5V
DC
HOW RANGEMAX WORKS
LAMP VOLTAGE & LAMP CURRENT — Burst Mode Operation
FIGURE 1 — 50% Burst Duty Cycle
FIGURE 2 — 2% Burst Duty Cycle
FIGURE 3 — 2% Burst Duty Cycle (Expanded Time Base)
FIGURE 4 — RangeMAX Block Diagram
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 4 of Figure 3 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.
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