EL Lamp Driver Using HV832MG

Posted on Feb 5, 2014

An EL lamp is a solid state, low power, uniform area light source. Because of its thin prole (as thin as 0. 3 mm) and the fact that it can be built into almost any size and shape, EL lamps are an ideal way to provide back-lighting for LCD displays, membrane keypads and a variety of other applications. Electroluminescent (EL) lamps offer signific

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ant advantages over point light sources such as LEDs, incandescent, and‚uorescent lighting systems. As a result of these advantages, EL lamps are seeing growing use. Many wireless phone and pager manufacturers are converting to EL lighting systems in keypads and displays. The typical lamp consists of light emitting phosphor sandwiched between two conductive electrodes with one of the electrodes transparent so allowing light to escape. As an AC voltage is applied to the electrodes, the electricaleld causes the phosphor to rapidly charge and discharge, resulting in the emission of light during each cycle. Since the number of light pulses depends on the magnitude of the applied voltage, the brightness of EL lamps can generally be controlled by varying the operating voltage. Because EL lamps are a laminate, they exhibit a capacitance of the order of 2. 5 nF to 3. 5 nF per square inch. When high voltage is applied across the electrodes, the resulting electriceld excites the phosphor atoms to a higher energy state. When the electriceld is removed, the atoms fall back to a lower energy state, emitting photons in the process. The wavelength of the emitted light is determined by the type of phosphor used and the frequency of the excitation voltage. With most phosphors, the spectrum of emitted light will tend to shift towards blue with an increase in excitation frequency. Color is usually controlled, however, by selecting the...

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