NJM78M20FA

Product Overview

Category

NJM78M20FA belongs to the category of voltage regulators.

Use

It is primarily used for regulating and stabilizing voltage in electronic circuits.

Characteristics

• Input Voltage Range: 24V - 40V
• Output Voltage: -20V
• Maximum Output Current: 0.5A
• Dropout Voltage: 2V
• Operating Temperature Range: -40°C to +125°C

Package

The NJM78M20FA comes in a TO-220 package, which is a widely used through-hole package for power semiconductors.

Essence

The essence of NJM78M20FA lies in its ability to provide a stable and regulated output voltage despite variations in the input voltage.

Packaging/Quantity

The NJM78M20FA is typically packaged in reels or tubes, with quantities varying depending on the manufacturer's specifications.

Specifications

• Input Voltage Range: 24V - 40V
• Output Voltage: -20V
• Maximum Output Current: 0.5A
• Dropout Voltage: 2V
• Line Regulation: ±0.2%
• Load Regulation: ±0.4%
• Ripple Rejection Ratio: 60dB (typical)
• Quiescent Current: 6mA (typical)
• Thermal Shutdown Protection: Yes

Detailed Pin Configuration

The NJM78M20FA 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 output voltage.

Functional Features

• Regulated Output: The NJM78M20FA ensures a stable and precise output voltage of -20V.
• Thermal Shutdown Protection: It incorporates a thermal shutdown feature to prevent overheating and protect the device.
• Low Dropout Voltage: The dropout voltage of 2V allows for efficient regulation even with low input voltages.

Advantages and Disadvantages

Advantages

• High stability and accuracy in regulating voltage.
• Wide input voltage range.
• Thermal shutdown protection ensures device safety.
• Low dropout voltage enables efficient operation.

Disadvantages

• Limited maximum output current of 0.5A.
• Requires external components for proper operation.

Working Principles

The NJM78M20FA is a negative voltage regulator that utilizes a series pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a stable output voltage.

Detailed Application Field Plans

The NJM78M20FA finds applications in various electronic circuits where a stable negative voltage source is required. Some common application areas include:

1. Audio Amplifiers: Provides a regulated negative voltage supply for audio amplification circuits.
2. Industrial Control Systems: Used in control systems to provide stable negative voltage for sensors, actuators, and other components.
3. Automotive Electronics: Utilized in automotive electronics for powering negative voltage-dependent devices.

Detailed and Complete Alternative Models

1. LM337: A popular alternative with similar specifications and functionality.
2. MC79M20: Another alternative offering negative voltage regulation with comparable characteristics.
3. LT1963A: Provides adjustable negative voltage regulation with higher output current capability.

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

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