L78M12ABDT-TR

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Fixed Output Voltage: 12V - Maximum Output Current: 500mA - Input Voltage Range: 14.5V to 35V - Dropout Voltage: 2V - Operating Temperature Range: -40°C to +125°C - Package Type: DPAK (TO-252) - Essence: Linear voltage regulator with a fixed output of 12V

Packaging/Quantity: The L78M12ABDT-TR is available in tape and reel packaging, with 2,500 units per reel.

Specifications

The L78M12ABDT-TR is a positive voltage regulator IC that provides a fixed output voltage of 12V. It is designed to regulate the input voltage within a specified range and provide a stable output voltage for various electronic applications. The key specifications of this IC are as follows:

• Output Voltage: 12V
• Output Current: Up to 500mA
• Input Voltage Range: 14.5V to 35V
• Dropout Voltage: 2V (maximum)
• Line Regulation: ±0.2%
• Load Regulation: ±0.4%
• Quiescent Current: 6mA (typical)
• Ripple Rejection Ratio: 62dB (typical)
• Thermal Shutdown Protection: Yes
• Short Circuit Protection: Yes

Pin Configuration

The L78M12ABDT-TR IC has three pins, each serving a specific function:

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 output voltage of 12V.

Functional Features

The L78M12ABDT-TR offers several functional features that make it suitable for voltage regulation applications:

1. Fixed Output Voltage: The IC provides a stable and fixed output voltage of 12V, regardless of input voltage fluctuations.
2. Low Dropout Voltage: With a maximum dropout voltage of 2V, the IC can maintain a stable output even when the input voltage is close to the desired output voltage.
3. Thermal Shutdown Protection: The IC incorporates thermal shutdown protection, which prevents damage due to excessive temperature.
4. Short Circuit Protection: The IC has built-in short circuit protection, safeguarding the device and the connected circuitry from damage in case of a short circuit.

Advantages and Disadvantages

Advantages: - Simple and easy to use. - Provides a stable output voltage. - Suitable for low-power applications. - Offers thermal and short circuit protection.

Disadvantages: - Limited maximum output current (500mA). - Requires an input voltage within the specified range.

Working Principles

The L78M12ABDT-TR is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It operates by comparing the reference voltage with the feedback voltage derived from the output. If the output voltage drops below the desired level, the control circuit adjusts the pass transistor to increase the output voltage. Conversely, if the output voltage exceeds the desired level, the control circuit reduces the pass transistor's conduction to lower the output voltage.

Detailed Application Field Plans

The L78M12ABDT-TR is commonly used in various electronic devices and systems that require a stable 12V power supply. Some typical application fields include:

1. Automotive Electronics: Used in automotive systems such as engine control units, infotainment systems, and lighting control modules.
2. Industrial Control Systems: Employed in industrial automation, motor control, and power supply units.
3. Consumer Electronics: Utilized in audio/video equipment, set-top boxes, and home appliances.
4. Telecommunications: Used in communication devices, routers, and network switches.

Detailed and Complete Alternative Models

1. LM7812: A widely used 12V linear voltage regulator with similar specifications and pin configuration.
2. MC7812: Another popular 12V voltage regulator IC offering comparable performance characteristics.
3. UA7812: A reliable 12V regulator IC suitable for various applications.

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

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