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SP4425UEB Datasheet(PDF) 6 Page - Sipex Corporation |
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SP4425UEB Datasheet(HTML) 6 Page - Sipex Corporation |
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6 / 14 page  SP4425DS/20 SP4425 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 6 Electroluminescent Technology What is electroluminescence? An EL lamp is basically a strip of plastic that is coated with a phosphorous material which emits light (fluoresces) when a high voltage (>40V) which was first applied across it, is removed or reversed. Long periods of DC voltages applied to the material tend to breakdown the material and reduce its lifetime. With these considerations in mind, the ideal signal to drive an EL lamp is a high voltage sine wave. Traditional approaches to achieving this type of waveform included discrete circuits incorporating a transformer, transistors, and several resistors and capacitors. This approach is large and bulky, and cannot be implemented in most hand held equipment. Sipex now offers low power single chip driver circuits specifically designed to drive small to medium sized electroluminescent panels if all that is required is one external inductor fast recovery diode and two capacitors. Electroluminescent backlighting is ideal when used with LCD displays, keypads, or other backlit readouts. Its main use is to illuminate displays in dim to dark conditions for momentary periods of time. EL lamps typically consume less than LEDs or bulbs making them ideal for battery powered products. Also, EL lamps are able to evenly light an area without creating "hot spots" in the display. The amount of light emitted is a function of the voltage applied to the lamp, the frequency at which it is applied, the lamp material used and its size, and lastly, the inductor used. Both voltage and frequency are directly related to light output. In other words as the voltage or the frequency of the EL output is increased the light output will also increase. The voltage has a much larger impact on light output than the frequency does. For example, an output signal of 168V PP with a frequency of 500Hz can yield 15Cd/m2, in the same application a different EL driver could produce 170V PP with a frequency of 450Hz and can also yield 15Cd/m2. Variations in peak to peak voltage and variations in lamp frequency are to be expected, light output will also vary from device to device however typical light output variations are usually not visually noticeable. There are many variables which can be optimized for specific applications. Sipex supplies characterization charts to aid the designer in selecting the optimum circuit configuration (see page 7 and 8). |
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