AN78L20

Product Overview

Category

AN78L20 belongs to the category of voltage regulators.

Use

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

Characteristics

• AN78L20 is a low-power, fixed-voltage regulator.
• It operates with an input voltage range of 7V to 35V.
• The output voltage is fixed at 20V.
• It has a maximum output current of 100mA.
• AN78L20 is designed to provide a stable and reliable power supply for various electronic devices.

Package

The AN78L20 voltage regulator is available in a TO-92 package.

Essence

The essence of AN78L20 lies in its ability to maintain a constant output voltage despite fluctuations in the input voltage.

Packaging/Quantity

AN78L20 is typically sold in packs containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

• Input Voltage Range: 7V to 35V
• Output Voltage: 20V (fixed)
• Maximum Output Current: 100mA
• Package Type: TO-92

Detailed Pin Configuration

AN78L20 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 or reference potential.
3. Output Pin (Vout): This pin provides the regulated output voltage.

Functional Features

• Voltage Regulation: AN78L20 ensures a stable output voltage of 20V regardless of variations in the input voltage.
• Overcurrent Protection: It incorporates overcurrent protection to prevent damage to the circuitry.
• Thermal Shutdown: AN78L20 includes thermal shutdown functionality to safeguard against overheating.

Advantages and Disadvantages

Advantages

• Compact Size: AN78L20 comes in a small package, making it suitable for space-constrained applications.
• Easy to Use: It requires minimal external components and is straightforward to integrate into electronic circuits.
• Cost-Effective: AN78L20 offers an affordable voltage regulation solution.

Disadvantages

• Limited Output Current: The maximum output current of 100mA may not be sufficient for high-power applications.
• Fixed Output Voltage: The output voltage cannot be adjusted, limiting its flexibility in certain scenarios.

Working Principles

AN78L20 operates based on the principle of linear voltage regulation. It utilizes a series pass transistor to regulate the output voltage. By comparing the reference voltage with the feedback voltage, AN78L20 adjusts the pass transistor's resistance to maintain a constant output voltage.

Detailed Application Field Plans

AN78L20 finds application in various electronic devices and circuits, including but not limited to: - Audio amplifiers - Power supplies - Battery chargers - Industrial control systems - Automotive electronics

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to AN78L20 are: - LM7805: A popular voltage regulator with a fixed 5V output. - LM317: A versatile adjustable voltage regulator capable of providing different output voltages. - L78xx: Series of fixed-voltage regulators available in various output voltage options.

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

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