Basic application and pin identification of three-terminal regulator

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The following figure illustrates the basic application circuit of the W7800 series three-terminal voltage regulators. These devices are commonly used in power supply designs to provide stable DC output voltages. Understanding their configuration is essential for proper implementation in electronic circuits.

The next image shows a symmetrical positive and negative voltage regulator circuit built using both W7800 and W7900 series three-terminal regulators. This configuration is often used in applications requiring dual power supplies, such as audio amplifiers or operational amplifier circuits. The W7900 series, which provides negative output voltages, follows a similar design principle.

Here is the basic application circuit for the W317 adjustable output voltage regulator. Unlike fixed-output regulators, the W317 allows users to adjust the output voltage by changing the value of an external resistor. This makes it highly versatile for various power supply applications.

Three-terminal voltage regulators typically come in two main package types: metal can packages, which resemble standard power transistors, and plastic packages, which are more compact and suitable for lower-power applications. It's important to note that pin functions may vary between different models, even within the same series. Always refer to the datasheet before connecting a regulator to a circuit, as incorrect wiring can damage the IC or other components.

To make identification easier, the following diagram shows the pinout and function descriptions for several commonly used three-terminal voltage regulators. This guide is particularly useful for engineers and hobbyists who work with various types of power management components.