Light emitting diodes (LEDs) provide efficient, reliable light sources in a wide range of applications. Since they have no moving parts, they are very reliable in environments with frequent vibration and shock, such as those found in automobiles. LEDs also have other outstanding characteristics, including high efficiency, long life, and high brightness. This makes them ideal for a variety of automotive applications, including headlights and taillights, backlights, and liquid crystal displays (LCDs). The use of LEDs in automotive applications such as headlights, daytime running lights, brake lights, and cabin lighting is limited by the LED drivers that are used to power the LEDs and isolate them from voltage or current fluctuations. These drivers are mainly powered by low dropout (LDO) DC linear regulators, which are a simple and economical way to regulate the output voltage from a high voltage input. However, LDOs cannot support the power requirements of high lumen headlights and running lights. The ambient temperature in LED environments can often reach and often exceed +125 °C. Another problem with this technology is that the high cost of LEDs and drivers has limited its use in luxury vehicles.
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