LM7815

The LM7815 is a fixed positive voltage regulator integrated circuit designed by Texas Instruments. It is a three-terminal voltage regulator that provides a fixed 15V output from a higher input voltage. The LM7815 is commonly used in power supplies to convert an unregulated DC voltage to a stable 15V output.

The LM7815 operates by comparing its output voltage to an internal reference voltage. If the output voltage drops below 15V, the regulator increases its output. Conversely, if the output voltage rises above 15V, the regulator decreases its output. This negative feedback mechanism helps maintain a constant output voltage, even as the input voltage or load current changes.

Key features of the LM7815 include:

A typical dropout voltage of 2V, meaning the input voltage must be at least 17V for the regulator to maintain a 15V output.

A maximum output current of 1A, which can be increased to 2A with a suitable heat sink.

A quiescent current of 1.5mA, which is the current drawn by the regulator itself when no load is connected.

A small package size, making it suitable for use in compact power supplies.

The LM7815 is available in various packages, including TO-220, TO-3, and SOT-23. It is widely used in applications such as powering LED displays, driving solenoids, and supplying voltage to other electronic circuits. However, it is important to note that the LM7815 is not suitable for use with input voltages above 35V, as this can damage the device.

In summary, the LM7815 is a reliable and efficient fixed voltage regulator that is well-suited for a wide range of applications. Its simple design and negative feedback mechanism make it a popular choice for power supply designers.