參數(shù)資料
型號(hào): LX1688CPW
廠商: MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP
元件分類(lèi): 穩(wěn)壓器
英文描述: MULTIPLE LAMP CCFL CONTROLLER
中文描述: FLUORESCENT LIGHT CONTROLLER, 70 kHz SWITCHING FREQ-MAX, PDSO24
封裝: ROHS COMPLIANT, PLASTIC, TSSOP-24
文件頁(yè)數(shù): 13/15頁(yè)
文件大?。?/td> 624K
代理商: LX1688CPW
Microsemi
Integrated Products, Power Management
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 13
Copyright
2001
Rev. 1.1a, 2003-03-21
W
M
.
C
RangeMAX
LX1688
M
ULTIPLE
L
AMP
CCFL
C
ONTROLLER
I N T E G R A T E D P R O D U C T S
A P P L I C A T I O N I N F O R M A T I O N
( C O N T I N U E D )
Digital Dimming
The following oscilloscope waveforms are showing gate
signals of Master and slaves during digital dimming at 50%
and 5% duty cycle.
Figure 6
-
Gate signals during digital dimming with 50%
duty cycle CH2= A
OUT
(Master),
CH3=A
OUT
(Slave1), CH4=A
OUT
(Slave2)
Figure 7
-
Gate signals during digital dimming with 5% duty
cycle CH2= A
OUT
(Master), CH3=A
OUT
(Slave1),
CH4=A
OUT
(Slave2
)
Output currents
Figure 8 shows the output current of master and slaves
during digital dimming with 5% duty cycle. The lamp currents
are operating in phase and frequency synchronization. This
prevents random interface between controllers and reduces
EMI.
Figure 8
-
Output current during
digital dimming with 5%
duty cycle R1= out(Master)
R2=Iout(Slave1)
R3=Iout(Slave2)
Lamp Current at 10mA/Div
A
P
P
L
I
C
A
T
I
O
N
S
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