NJM78M15FA

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics:
  • Fixed Output Voltage: -15V
  • Maximum Output Current: 500mA
  • Low Dropout Voltage
  • Thermal Shutdown Protection
• Package: TO-220F
• Essence: The NJM78M15FA is a voltage regulator IC that provides a fixed output voltage of -15V with a maximum output current of 500mA. It is designed to regulate and stabilize the input voltage to ensure a constant -15V output.
• Packaging/Quantity: The NJM78M15FA is available in a TO-220F package and is typically sold in reels or tubes containing multiple units.

Specifications

• Input Voltage Range: 17V to 35V
• Output Voltage: -15V ±5%
• Output Current: Up to 500mA
• Dropout Voltage: 2V (typical)
• Quiescent Current: 6mA (typical)
• Line Regulation: 0.01%/V (typical)
• Load Regulation: 0.1% (typical)
• Ripple Rejection Ratio: 60dB (typical)
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The NJM78M15FA has three pins:

1. Input Pin (VIN): Connects to the input voltage source.
2. Ground Pin (GND): Connected to the ground reference.
3. Output Pin (VOUT): Provides the regulated -15V output voltage.

Functional Features

• Fixed Output Voltage: The NJM78M15FA maintains a constant -15V output voltage regardless of variations in the input voltage or load conditions.
• Low Dropout Voltage: The regulator has a low dropout voltage of 2V, allowing it to operate efficiently even when the input voltage is close to the desired output voltage.
• Thermal Shutdown Protection: The IC includes built-in thermal shutdown protection, which prevents damage due to excessive temperature by shutting down the regulator temporarily.
• Stable Output: The NJM78M15FA provides stable and reliable -15V output voltage, suitable for various applications.

Advantages and Disadvantages

Advantages: - Fixed output voltage ensures stability in regulated applications. - Low dropout voltage allows efficient operation even with small input-output differentials. - Thermal shutdown protection prevents damage from overheating.

Disadvantages: - Limited maximum output current of 500mA may not be sufficient for high-power applications. - Requires external capacitors for stability and noise reduction.

Working Principles

The NJM78M15FA is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor's resistance to maintain a constant -15V output. The regulator operates in a continuous feedback loop to ensure stability and regulation.

Detailed Application Field Plans

The NJM78M15FA is commonly used in various electronic devices and systems where a stable -15V power supply is required. Some typical application fields include:

1. Audio Amplifiers: The voltage regulator provides a stable power source for audio amplifiers, ensuring consistent performance and minimizing noise.
2. Industrial Control Systems: It is used in industrial control systems to regulate power supplies for sensors, actuators, and other components.
3. Telecommunications Equipment: The NJM78M15FA is employed in telecommunications equipment to provide a reliable -15V power source for various circuitry.
4. Automotive Electronics: It finds applications in automotive electronics, such as in-car entertainment systems, where a regulated -15V supply is necessary.

Detailed and Complete Alternative Models

1. LM337: A negative voltage regulator with adjustable output voltage.
2. MC7915: A fixed -15V voltage regulator with similar specifications.
3. LT1963A-15: A low dropout -15V voltage regulator with higher maximum output current capability.

These alternative models offer similar functionality and can be used as substitutes for the NJM78M15FA depending on specific requirements.

Word count: 511 words