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參數(shù)資料
| 型號： | LX1688CPW |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大小： | 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 10
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
Application example with LX1688
This section will highlight the features of LX1688
controller by showing a practical example. Three
identical inverter modules are connected to each other
and each module drives a single lamp. One module
configured as a master and two others configured as
slaves.
A complete schematic hooked up a a master is given in
Figure 1, the schematic provides all necessary functions
such as high voltage feedback for regulation the peak
lamp voltage, short-circuit protection, open lamp sensing
and lamp current regulation needed for a typical
application. The section follows with measurement
waveforms and list of material of the actual modules. For
more detail design procedure and circuit description
please refer to application note (AN-13), which is
available in Microsemi’s web site.
Input Voltage
The LX1688 controller can operate at 3.3 to 5.0V
±
10%, in this application all modules were driven by the
same power voltage (a constant 5.0V), which provides
VDD for controllers, and input voltage for the power
section. Notice that VDD feeds all analog signals and
VDD_P feeds only the output driver stage, these two
signals should be filtered separately (Figure 1).
Setting lamp frequency
The value of R1 determines magnitude of internal
current sources that set timing parameters. Equation (2)
gives the relationship between Lamp frequency (F
LAMP
)
and (R
I_R
), R1 in schematic. For this application we
choose R6=80.6 Kohm, which results to a lamp
frequency at 62.0 KHz.
Dimming
The LX1688 includes highly integrated universal
‘PWM or DC’ dim input that allows either a PWM or DC
input without requiring external conditioning.
In this application we choose Digital Dimming by
applying a PWM signal to BRITE pin.
All modules were driven by the same PWM signals,
but notice that it is possible to dim each module quite
separately.
BEPOL pin has three different modes (see table 1), in
this application it is connected to VDD which means
active high enable with active high full brightness.
The PWM signal can be varied in frequency between
48-320 HZ. No capacitor between CPWM1 and CPWM2
is necessary.
Setting Master/Slave configuration
Simply connecting pin 14 to the ground for a master and
to the VDD for a slave will do master and slave
configuration. As shown in figure 2, module (A) configured
as master and modules (B) and (C) configured as slaves.
Synchronization of Frequency and Phase
To synchronize the Lamp frequency and phase of all
modules, it is required to connect the RMP_RST pin of all
the modules together and connect PHA_SYNC pin of all the
modules together.
Layout consideration
By designing the layout in a proper way we can reduce the
overall noise and EMI for the module.
The gate drivers for MOSFETs should have an
independent loop that doesn’t interface with the more
sensitive analog control function, therefore LX1688
provides two power inputs with separate ground pins
(analog/signal), VDD feeds all analog signals and VDD_P
feeds only the output drivers, as shown in figure1 these two
pins (pin 23, 24) are separated and filtered by R14, C2 and
C7. The connection of two ground pins should be at only
one point as shown in figure1.
The power traces should be short and wide as possible and
all periphery components such capacitors should be located
as closed as possible to the controller.
Oscilloscope Waveforms Pictures
The following oscilloscope waveform pictures are taken
from the actual circuits and will show the operation of the
modules in different modes when three identical modules
are synchronized, one as a master, and two others as slaves.
A
P
P
L
I
C
A
T
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LX1688CPW-TR | 制造商:Microsemi Corporation 功能描述:CCFL DRVR 5.5V 24TSSOP - Tape and Reel |
| LX1688IPW | 功能描述:IC CTRLR CCFL BACKLIGHT 24TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
| LX1688IPW-TR | 制造商:Microsemi Corporation 功能描述:CCFL Controller 3.3V/5V 24-Pin TSSOP T/R 制造商:Microsemi Corporation 功能描述:CCFL DRVR 5.5V 24TSSOP - Tape and Reel |
| LX1689 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Third Generation CCFL Controller |
| LX1689_06 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Third Generation CCFL Controller |
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