5S25.030LCD [ETC]
Analog IC ; 模拟IC\n
| 型号： | 5S25.030LCD |
| 厂家： | 
ETC |
| 描述： | Analog IC
|
| 文件： | 总2页 (文件大小：86K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
.38 Watt LCD Single Series DC/DC Converters
Features
!
3 or 5 Volt Inputs
!
Positive or Negative LCD Bias Output
!
Simple 4 Terminal Operation
!
Low Cost
!
Small Sealed SIP Package
!
5 Year Warranty
Description
Selection Chart
Input Range
VDC
The LCD Series of DC/DC converters provides a low cost way
to derive the bias voltage for LCD displays in systems where
only 3 or 5 volt digital voltages are available.
Output
Model
Min
Nom
Max
VDC
mA
The LCD series converts 3 or 5 volt inputs to an isolated 25
voltsDCatupto750milliwattsofpower. Thesimple4terminal
operation allows for quick system design.
3S25.015LCD
5S25.030LCD
3.0
4.5
3.3
5.0
3.6
5.5
25
25
15
30
Load Regulation,
25% to 100% Load
25% Typical
The isolated output allows the LCD converter to be
connected in either a positive output mode for color displays
or as a negative bias for monochrome displays.
Line Regulation
Efficiency
1.3% / % VIN Typical
60% Typical
The LCD series is packaged in an environmentally rugged
plastic case. The use of special potting compounds allows the
converters to be water washed and operate over the full -40°
to 85°C industrial temperature range.
Operating Temperature Range
(Case)
-40° to 85°C
Specifications subject to change without notice.
For a positive LCD Bias voltage connect pin 3 to pin 2 and
take the positive bias voltage from pin 4. For a negative bias
voltage connect pin 4 to pin 2 and take the negative bias
voltage from pin 3. These connections are shown in figure 2.
Applications Information
Connecting To Your System
Figure 1 shows the input and output connections for the LCD
series of converters. The output should be bypassed with at
least a 4.7 µF tantalum capacitor. For lower noise operation,
especially at low temperatures this value may be increased to
10 or 20 µF as required.
A
Figure 1.
The output of the LCD series should be bypassed with a 4.7 to 20µF
tantalum. The input may need to be bypassed if the converter is
more than 1 to 2 inches from the input source or if the source
impedance is high.
Figure 2.
The input should be bypassed if it is more than about 1 or
2inchesfromtheinputsupplyoriftheinputsourceimpedance
is large. A 1 to 20 µF tantalum works well for the input bypass.
The LCD series may be connected to supply either a positive or
negative LCD bias voltage as shown.
2401 Stanwell Drive
•
Concord, California 94520
•
Ph: 925/687-4411 or 800/542-3355
•
Fax: 925/687-3333
•
www.calex.com
•
Email: sales@calex.com
eco: 010918-2, 9/2001
1
.38 Watt LCD Single Series DC/DC Converters
Pin Out
Generating Adjustable Bias Voltages
direct digital control of the LCD bias voltage. The basic circuits
shown work for either positive or negative bias voltages. Due
to the fact that the LCD series converters are isolated from the
input circuits they can’t “tell” how they are hooked up. As long
as the load current flows from out of the +output to the -output,
what is called ground is arbitrary.
MostLCDApplicationsrequireanadjustableLCDbiasvoltage.
Sinceeverysystemhasdifferentrequirementsforadjustability
and power level, several typical circuits are given. These
circuits although shown with trimpot adjustment, may be
easily adapted to digital control by connecting a D/A converter
output to the bottom of the divider resistors. This will allow
Circuit A
Circuit B
Low Power Bias Adjust
Low Cost Bias Adjust
Circuit C
Circuit D
A
Regulated Bias Adjust
Minimum Parts Regulator
Figure 3.
Circuits A-D show several increasingly accurate methods for controlling the LCD Bias voltage as may be required for your specific display. In
all cases the divider resistors and trimpot should be selected to give the proper range of output voltage as required by your circuit. These circuits
may be used for positive or negative LCD bias adjustments as required. Just insert the circuits shown between the LCD output and any ground
connections as shown in figure 2.
2401 Stanwell Drive
•
Concord, California 94520
•
Ph: 925/687-4411 or 800/542-3355
•
Fax: 925/687-3333
•
www.calex.com
•
Email: sales@calex.com
eco: 010918-2, 9/2001
2
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