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Posttime: 10 Dec, 2013 Views: 79 Author: Jacky

Input/Outpur protection against abnormal load

LED is drove by the constant current, the forward voltage range is from 2 to 4.5V, which is related to the color and current. The old design relies on a simple resistor to limit the LED drive current, but the typical forward voltage drop of LED circuit design that is based on the manufacturer rules will cause the LED drive device overheat. When the LED forward voltage drops down to far below the level of the typical value, it may appear this circumstance. In such event, the voltage of LED drive device increases, which may lead to the total power dissipation from the drive package higher, therefore, it will adversely affect the performance or the life.

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