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SP4424CX Datasheet(PDF) 5 Page - Sipex Corporation |
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SP4424CX Datasheet(HTML) 5 Page - Sipex Corporation |
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5 / 12 page  SP4424DS/16 SP4424 Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation 5 CIRCUIT LAYOUT CONSIDERATIONS: The SP4424 IC incorporates two independent asynchronous oscillators, one of which supplies the signal for switching of the coil transistor which generates the coil charge pulses and the other supplies the clock signal to switch the high voltage H-bridge output circuit. It is necessary to keep all high voltage signals away from these oscillator clock signals as much as possible as crosstalk between the two signals can cause distortion in the EL drive signal which can result in either low light output or blinking of the EL lamp. It is always recommended that a low ESR decoupling capacitor (0.1 µF or >) be used between the V DD (pin 6) and ground (pin 2). The V SS (gnd) pin should in turn be connected to the system ground plane. If it is connected via a circuit trace, this trace should be as short and as wide as possible. 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. 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, power hungry, expensive and bulky, and would be difficult to 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. All that is required is one external inductor and capacitor. Electroluminescent backlighting is ideal for use with LCD displays, keypads, or other backlit readouts. Its primary use is to illuminate displays in dim to dark conditions for momentary periods of time. EL lamps typically consume less current 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 level applied to the lamp, the frequency at which it is applied and the lamp size and method of construction . There are many variables which can be optimized for specific applications. Sipex supplies custom characterization data to aid the designer in selecting the optimum circuit configuration. |
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