KA78T05TU

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The KA78T05TU, also known as a three-terminal positive voltage regulator, is a key component for many types of circuit protection and voltage regulation applications. This linear regulator operates from 1.5 to 15 volts nominal input supply and outputs 0.8 volts at up to 1.5 amps. It also has a few features that make it stand out from traditional linear regulators. These features include low quiescent current, high surge current capability, an accurate regulation voltage, and a low drop-out voltage.

In terms of applications, the KA78T05TU linear regulator can be used to provide a regulated output voltage from an unregulated source, such as a battery or solar panel. It is also commonly used to provide over-voltage protection in devices such as amplifiers, power supplies and data converters. In addition, its low quiescent current makes it an ideal choice for energy-restrained applications, such as car audio, phones, portable electronics and more.

In terms of its working principle, the KA78T05TU linear regulator employs ‘series voltage regulation’, wherein the output voltage is regulated by comparing the output with an internal reference voltage. The internal reference voltage is designed to be around 0.8 volts, and this is why the KA78T05TU has an output voltage of 0.8 volts at a regulated current rating of 1.5 amps. When the input voltage is higher than the output voltage, an error signal is generated, which is then fed to the series regulator. This helps to minimize the output voltage by increasing the input current. Similarly, when the input voltage is lower than the output voltage, the error signal attempts to lessen the output voltage by reducing the input current.

In addition to its remarkable regulation capabilities, the KA78T05TU features low quiescent current consumption and high surge capability. The quiescent current refers to the amount of current that a device draws when its output is set to a fixed level, and the KA78T05TU achieves a quiescent current consumption of less than 120μA at a 25°C ambient temperature. As for its surge capability, it can handle up to 1.5 amps of current, making it capable of providing up to 3 times its nominal current rating.

To sum up, the KA78T05TU is a three-terminal positive voltage regulator with a wide range of potential application areas, from providing over-voltage protection in amplifiers and power supplies to supplying a regulated output voltage from an unregulated source. Moreover, its high surge current capability, accurate voltage regulation and low quiescent current consumption make it an ideal component for energy-restrained applications. For these reasons and more, the KA78T05TU is an important component for many circuit protection and voltage regulation applications.

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