MC79L12ACP

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MC79L12ACP is a three terminal adjustable positive voltage regulator, which belongs to PMIC (Power Management Integrated Circuit), and is classified into Voltage Regulators - Linear. It is designed to provide a regulated output voltage from 3 to 15V, with a load regulation of 0.3 percent and an exceptionally low line regulation of 0.01 percent over a given line and load range. The device includes thermal overload protection that shuts off output in case of excessive device temperature.

Features

MC79L12ACP provides some excellent features:

• Load regulation of 0.3 percent over a full load range
• Line regulation of 0.01 percent from 10 to 30V
• Reverse break-down voltage of 5V
• Power dissipation capability of 800mW
• Current limiting and thermal overload protection

Package

The device comes in a TO-92 package, which is a highly reliable three-lead plastic package suitable for many low power applications.

Applications

MC79L12ACP has various applications, such as in battery-powered devices, portable radio and tape recorders, toys, and instrumentation equipment. It is also used in other applications such as motion security systems, LED lighting systems, and low-voltage power supplies.

Working Principle

MC79L12ACP is a voltage regulator that works on the principle of negative feedback. The main components of the device are an output transistor, an error amplifier and a voltage reference. The output voltage is determined by the voltage reference and is compared with the voltage at the output via the error amplifier. The error amplifier then compares the two voltages and adjusts the output transistor to obtain the desired output voltage.

To ensure stability of the device, an internal compensation network is provided. It incorporates a compensation capacitor, which is used to adjust the phase margin of the system. The output voltage of the device is maintained by the voltage reference and is regulated by the error amplifier. The current-limiting and thermal overload protection circuitry prevents damage to the device by limiting the peak currents, and in case of excessive device temperature, the output is shut off.

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