AN79L12

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Linear voltage regulators are used in a variety of applications, such as regulation of the output voltage for power supplies and power management for other circuits. The AN79L12 is an example of a linear voltage regulator integrated circuit. It is a 3-terminal device that can provide an adjustable voltage output from 1.8V to 20V, with an output current capability of up to 1.5A. This makes it suitable for powering a wide range of circuits.

Features of the AN79L12

• Output voltage adjustment range of 1.8V to 20V.
• Output current capability of up to 1.5A.
• Thermal protection and over-voltage protection.
• High ripple rejection ratio.
• Output voltage accuracy of +/-2%.
• On-chip trimming of the output voltage.
• Low dropout voltage.
• Low quiescent current.

The AN79L12 is categorized as a PMIC (Power Management Integrated Circuit) and designed for use as a linear voltage regulator in various electronic applications. The IC is available as a package of 8-lead PDIP (Plastic Dual In-line Package) or 8-lead SO (Small-Outline) package.

Working Principle of the AN79L12

The AN79L12 is a 3-terminal linear voltage regulator IC. It is basically an open-loop voltage regulator with an output voltage that can be determined by the setting of an internal voltage divider. The IC works on the principle of negative feedback. When the input voltage exceeds the set point of the output voltage, the output voltage will be adjusted accordingly in order to maintain the output voltage within the desired range.

The working of the AN79L12 is as follows: The input voltage is applied to the VIN terminal. This voltage is compared to a reference voltage at pin 6 (VREF). A voltage error amplifier compares the voltages at the VIN and VREF pins and produces an error signal. This signal is then fed to a controller, which maintains the output voltage according to the VREF voltage. The output voltage is regulated by adjusting the voltage divider internally.

The output voltage of the device is trimmed by an internal potentiometer. This allows the output voltage to be adjusted according to the required application. In addition, the device has an over-voltage protection circuit, which prevents the output voltage from exceeding the maximum specified limit.

The AN79L12 also has a built-in thermal protection circuit. If the device overheats, this circuit will shut down the power supply, preventing the IC from overheating and possible damage.

Conclusion

The AN79L12 is a linear voltage regulator IC that is suitable for use in many applications. It is capable of providing an adjustable voltage output from 1.8V to 20V, with an output current capability of up to 1.5A. It has features such as over-voltage protection, thermal protection, and an on-chip trimming of the output voltage. It is a 3-terminal device with a low dropout voltage and low quiescent current, making it an ideal choice for use in power supply and power management applications.

The AN79L12 is classified as a PMIC (Power Management Integrated Circuit) and is designed for use as a linear voltage regulator in various electronic applications. Its working principle is based on negative feedback, and its output voltage is adjusted by means of an internal voltage divider.

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