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LED - Light-emitting diodes
If bright lights turn you on, you can appreciate the curious behavior of semiconductors: They emit light when you apply an electric current to them. This light is generally very dim and only in the infrared region of the electromagnetic spectrum. The light-emitting diode (LED), such as the light that glows yellow or green when your computer is on, is a special type of semiconductor expressly designed to emit copious amounts of light. Most LEDs are engineered to produce red, yellow, or green visible light, but some special-purpose types emit infrared, blue, and even white light. Keep polarity in mind when using diodes. The stripe on a diode marks its cathode. LEDs carry the same specifications as any other diode, but they usually have a pretty low current rating. An LED has a PIV rating of about 100 to 150 volts, with a maximum current rating of under 50 milliamps. If more current passes through an LED than its maximum rating allows, the LED burns up like a marshmallow in a campfire. LED specifications indicate both the maximum current rating, usually referred to as forward current, and the peak current. The peak current is the absolute maximum current that you can pass through the LED for a very short period of time. Here, short means short — on the order of milliseconds. Don’t confuse forward current with peak current, or you may wreck your LED. |
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This intel was contributed by Puniksem
Puniksem
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May, 2012
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