AN78L18M

Product Overview

Category

AN78L18M belongs to the category of voltage regulators.

Use

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

Characteristics

• AN78L18M is a low-power, fixed-voltage regulator.
• It operates with an input voltage range of 7V to 35V.
• The output voltage is fixed at 18V.
• It has a maximum output current of 100mA.
• AN78L18M offers excellent line and load regulation.

Package

AN78L18M is available in a TO-220 package.

Essence

The essence of AN78L18M lies in its ability to provide a stable and regulated 18V output voltage for various electronic applications.

Packaging/Quantity

AN78L18M is typically sold in reels or tubes, containing a specific quantity of units per package. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Input Voltage Range: 7V to 35V
• Output Voltage: 18V (fixed)
• Maximum Output Current: 100mA
• Line Regulation: ±0.2%
• Load Regulation: ±0.4%
• Dropout Voltage: 2V (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

AN78L18M has three pins:

1. Vin (Input): This pin is used to connect the input voltage source.
2. GND (Ground): This pin is connected to the ground reference.
3. Vout (Output): The regulated 18V output voltage is obtained from this pin.

Functional Features

• Low-power consumption
• Excellent line and load regulation
• Thermal shutdown protection
• Short-circuit protection
• Overcurrent protection

Advantages and Disadvantages

Advantages

• Provides a stable and regulated 18V output voltage.
• Low-power consumption ensures energy efficiency.
• Offers protection against thermal shutdown, short-circuits, and overcurrent.

Disadvantages

• Limited maximum output current of 100mA.
• Dropout voltage of 2V may not be suitable for applications with low input voltages.

Working Principles

AN78L18M operates based on the principle of linear voltage regulation. It uses a series pass transistor to regulate the output voltage by adjusting the resistance between the input and output terminals. This allows it to maintain a constant 18V output voltage despite variations in the input voltage or load conditions.

Detailed Application Field Plans

AN78L18M finds application in various electronic devices and circuits that require a stable 18V power supply. Some common application fields include:

1. Audio Amplifiers: AN78L18M can be used to provide a regulated power supply for audio amplifier circuits.
2. Industrial Control Systems: It is suitable for powering control systems in industrial applications.
3. Automotive Electronics: AN78L18M can be utilized in automotive electronics, such as dashboard displays or infotainment systems.
4. Battery Charging Circuits: It can be employed in battery charging circuits to ensure a stable voltage supply.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to AN78L18M are:

1. LM7818: A popular voltage regulator with a fixed 18V output.
2. MC78L18: Another low-power voltage regulator providing a regulated 18V output.
3. UA7818: A series of three-terminal positive voltage regulators, including an 18V variant.

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

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