L4947L

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Linear voltage regulators are widely used in electrical systems and are a popular choice for regulating output voltage, current or both simultaneously in order to provide a stable and reliable power source for a circuit or device. The L4947L is a three terminal linear voltage regulator, offering high accuracy and protection from over-voltage and over-current on the output. It can be used to step up or step down a regulated DC input voltage. Depending on the application, it is available in different package types, such as SMD, thru-hole, and vertical mount.

The working principle of the L4947L regulator is based on an active element which is usually a power transistor in its common emitter configuration. It is not true linear regulation like the Zener diode and therefore it works on the principle of controlling the collector current, with a slight variation in input voltage. The output voltage is kept stable by controlling the base-emitter voltage with a feedback loop. Once a certain base-emitter voltage is achieved, the current through the transistor remains constant.
The device is also equipped with several features to facilitate its use. It includes both short circuit and over-voltage protection. It also includes thermal shut-down protection. This will shut down the device if the temperature in its working environment gets too high. Furthermore, the device has a low current dissipation, which makes it highly efficient and reliable.

The L4947L regulator is commonly used in automotive and industrial applications such as controlling inverter output voltage, motor drives, voltage applications for motor and transformer control. It can also be used for DC to DC converters, providing regulated power to various electrical components including microprocessors, displays, and power converters. This device can also be used in audio and communication applications, controlling the output voltage of amplifiers, transmitters and receivers. In addition, it can be used in power supplies, and to regulate the output voltage of solar panels.

In conclusion, the L4947L is a very versatile three terminal linear voltage regulator, offering high accuracy and reliable output voltage regulation and protection. It can easily be implemented in a wide range of applications, providing a stable and efficient power source.

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