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The small size and battery-powered operation often associated with LCD-equipped apparatus dictate low component count and high efficiency. Size constraints place limitations on circuit architecture and often long battery life is a priority. Problem/Solution : Power for LCDs is derived from 5V and 12V buses. The LCD controller itself and the surrounding controller logic are powered from the 5V bus. The LCD inverter and other electronics on the board are powered from the 12V bus. Misconnections and mishandling either during assembly or during use of a wake-up port can cause large overloads and short-circuits to the system. In addition, component failures on the board can destroy the entire board. Isolating critical circuits with separate PolySwitch devices (as shown in Figure 1) helps prevent expensive components from being damaged during this type of fault. Typical Schematic Figure.
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