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.38 Watt LCD Single DC/DC Converter
Features
5 Volt Input Positive or Negative LCD Bias Output Simple 4 Terminal Operation Low Cost Small Sealed SIP Package 5 Year Warranty
Selection Chart
Model Min Input Range VDC Nom 5.0 Max 5.5 25% Typical 1.3% / % VIN Typical 60% Typical -40 to 85C Output VDC 25 mA 30
Description
The Model 5S25.030LCD DC/DC converter provides a low cost way to derive the bias voltage for LCD displays in systems where only 5 volt digital voltage is available. The LCD model converts 5 volt inputs to an isolated 25 volts DC at up to 750 milliwatts of power. The simple 4 terminal operation allows for quick system design. 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. The LCD 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 85C industrial temperature range.
5S25.030LCD Load Regulation, 25% to 100% Load Line Regulation Efficiency
4.5
Operating Temperature Range (Case)
Specifications subject to change without notice.
NOTE (1) Water Washability - Calex DC/DC converters are designed to withstand most solder/wash processes. Careful attention should be used when assessing the applicability in your specific manufacturing process. Converters are not hermetically sealed.
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 F tantalum capacitor. For lower noise operation, especially at low temperatures this value may be increased to 10 or 20 F as required.
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.
A
Figure 1. The output of the LCD model should be bypassed with a 4.7 to 20F 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.
The input should be bypassed if it is more than about 1 or 2 inches from the input supply or if the input source impedance is large. A 1 to 20 F tantalum works well for the input bypass.
Figure 2. 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
1
eco: 010918-2, eco# 041007-1, eco# 050628-1
.38 Watt LCD Single DC/DC Converter
Pin Out
Generating Adjustable Bias Voltages Most LCD Applications require an adjustable LCD bias voltage. Since every system has different requirements for adjustability 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 Low Power Bias Adjust
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.
Circuit B Low Cost Bias Adjust
Circuit C Regulated Bias Adjust
Circuit D Minimum Parts Regulator
A
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
2
eco: 010918-2, eco# 041007-1, eco# 050628-1

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