L7805ABP

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The L7805ABP is a linear voltage regulator that is commonly used to provide a stable 5V supply. It is a 3-terminal positive voltage regulator capable of supplying a load of up to 1A.

The application field of the L7805ABP can be found in numerous electronic circuits, such as microcontroller power supplies and motor/solenoid controlled devices. Aside from supplying 5V, this linear regulator can work with input voltages from 8 to 20V and delivers a maximum output current of 1A.

Now let\'s take a look at the working principle of the L7805ABP.

At the heart of this regulator lies an integrated circuit type LM3x4x. It has 3 pins, namely the input voltage, the output voltage and ground. The internal components of this IC work together such that it compares the input voltage to a predetermined reference voltage (5V). It then adjusts the output voltage accordingly. This adjustment is done by controlling the current flow to the output, using a series-base transistor.

The device works in two modes, the Line Regulation Mode and the Load Regulation Mode. In Line Regulation Mode the voltage regulator keeps the output voltage stable regardless of how much the input voltage varies. In Load Regulation Mode the voltage regulator keeps the output voltage in a tight range, regardless of the output load current. The device has protection against transient overvoltages or current surges that could damage the IC or the output device.

The L7805ABP voltage regulator is fairly efficient, and when not driving heavy loads, it can efficaciously convert any input voltage between 8V to 20V into a nicely regulated 5V output voltage. This device is also cheaper than other voltage regulators, as it is usually available in an TO-220-3 package and is easy to install. That’s why the L7805ABP is such a popular regulator when aiming for an inexpensive 5V power supply.

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