AN77L09

Product Overview

Category

AN77L09 belongs to the category of voltage regulators.

Use

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

Characteristics

• AN77L09 is a linear voltage regulator.
• It operates with an input voltage range of 11V to 35V.
• The output voltage is fixed at -9V.
• It has a maximum output current of 0.1A.
• AN77L09 is designed to provide a stable and reliable power supply for various electronic devices.

Package

The AN77L09 voltage regulator comes in a TO-92 package.

Essence

The essence of AN77L09 lies in its ability to maintain a constant output voltage despite fluctuations in the input voltage.

Packaging/Quantity

AN77L09 is typically packaged in reels or tubes, containing a quantity of 1000 units per package.

Specifications

• Input Voltage Range: 11V to 35V
• Output Voltage: -9V
• Maximum Output Current: 0.1A
• Package Type: TO-92
• Package Quantity: 1000 units

Detailed Pin Configuration

AN77L09 has three pins:

1. Input Pin (Vin): This pin is connected to the input voltage source.
2. Ground Pin (GND): This pin is connected to the ground reference.
3. Output Pin (Vout): This pin provides the regulated -9V output voltage.

Functional Features

• Voltage Regulation: AN77L09 ensures a stable -9V output voltage regardless of variations in the input voltage.
• Overcurrent Protection: It incorporates overcurrent protection to safeguard the connected circuitry.
• Thermal Shutdown: AN77L09 includes thermal shutdown protection to prevent overheating.

Advantages

• Simple to Use: AN77L09 is easy to integrate into electronic circuits due to its straightforward pin configuration.
• Reliable Performance: It provides a stable and regulated output voltage, ensuring the proper functioning of connected devices.
• Overcurrent Protection: The built-in overcurrent protection feature prevents damage to the circuitry in case of excessive current flow.

Disadvantages

• Limited Output Current: AN77L09 has a maximum output current of 0.1A, which may not be sufficient for power-hungry applications.
• Fixed Output Voltage: The -9V output voltage cannot be adjusted, limiting its flexibility in certain scenarios.

Working Principles

AN77L09 operates based on the principle of linear voltage regulation. It utilizes a series pass transistor to regulate the output voltage. By comparing the output voltage with a reference voltage, it adjusts the transistor's conduction to maintain a constant -9V output.

Detailed Application Field Plans

AN77L09 finds application in various electronic devices and circuits, including:

1. Audio Amplifiers: It can be used to provide a stable power supply for audio amplifiers, ensuring high-quality sound reproduction.
2. Instrumentation Systems: AN77L09 is suitable for powering analog and digital instrumentation systems, maintaining accurate measurements.
3. Communication Equipment: It can be employed in communication devices to stabilize the voltage supply, enhancing signal integrity.
4. Battery Charging Circuits: AN77L09 can regulate the voltage in battery charging circuits, preventing overcharging and prolonging battery life.

Detailed and Complete Alternative Models

Some alternative models that serve similar functions to AN77L09 include:

1. LM7809: A popular linear voltage regulator with a fixed 9V output.
2. MC7909: Another linear voltage regulator providing a fixed -9V output.
3. LT1086: A versatile adjustable voltage regulator capable of delivering higher currents.

These alternatives offer different features and specifications, allowing users to choose the most suitable option for their specific requirements.

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