AN79L18

Product Overview

Category

AN79L18 belongs to the category of voltage regulators.

Use

It is primarily used to regulate and stabilize the output voltage in electronic circuits.

Characteristics

• AN79L18 is a low-dropout linear voltage regulator.
• It operates with an input voltage range of -35V to -12V.
• The output voltage is fixed at -18V.
• It has a maximum output current of 100mA.
• AN79L18 is designed to provide a stable and reliable power supply for various electronic devices.

Package

The AN79L18 voltage regulator is available in a TO-92 package.

Essence

The essence of AN79L18 lies in its ability to maintain a constant -18V output voltage despite fluctuations in the input voltage.

Packaging/Quantity

AN79L18 is typically sold in packs containing multiple units. The exact quantity may vary depending on the manufacturer.

Specifications

• Input Voltage Range: -35V to -12V
• Output Voltage: -18V
• Maximum Output Current: 100mA
• Package Type: TO-92

Detailed Pin Configuration

AN79L18 has three pins:

1. Input (VIN): This pin is connected to the input voltage source.
2. Ground (GND): This pin is connected to the ground or reference voltage.
3. Output (VOUT): This pin provides the regulated -18V output voltage.

Functional Features

• Low dropout voltage: AN79L18 has a low dropout voltage, ensuring efficient regulation even when the input voltage is close to the desired output voltage.
• Overcurrent protection: It incorporates overcurrent protection to safeguard the connected circuitry from excessive current flow.
• Thermal shutdown: AN79L18 includes thermal shutdown protection, which prevents overheating and potential damage to the device.

Advantages and Disadvantages

Advantages

• Stable output voltage: AN79L18 maintains a constant -18V output voltage, ensuring reliable performance of electronic devices.
• Compact size: The TO-92 package makes it suitable for applications with limited space.
• Overcurrent and thermal protection: The built-in protection features enhance the safety and longevity of the device.

Disadvantages

• Limited output current: AN79L18 has a maximum output current of 100mA, which may not be sufficient for high-power applications.
• Restricted input voltage range: The input voltage must fall within the range of -35V to -12V for proper operation.

Working Principles

AN79L18 operates based on the principle of linear voltage regulation. It utilizes a pass transistor to regulate the output voltage by adjusting the resistance in the circuit. By comparing the output voltage with a reference voltage, AN79L18 continuously adjusts the resistance to maintain a stable -18V output.

Detailed Application Field Plans

AN79L18 finds application in various electronic circuits that require a regulated -18V power supply. Some common application areas include:

1. Audio Amplifiers: AN79L18 can be used to provide a stable power source for audio amplifiers, ensuring consistent sound quality.
2. Instrumentation Systems: It is suitable for powering analog sensors and signal conditioning circuits in instrumentation systems.
3. Communication Equipment: AN79L18 can be employed in communication devices such as transceivers and routers to ensure reliable operation.

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to AN79L18 are:

1. LM7918: This voltage regulator also provides a fixed -18V output and has comparable specifications to AN79L18.
2. MC79L18: MC79L18 is another low-dropout linear voltage regulator that offers a stable -18V output.

These alternative models can be considered based on specific requirements and availability.

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