NJR Corporation/NJRC
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NJM79M09FA
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NJM79M09FA

Product Overview

  • Category: Integrated Circuit
  • Use: Voltage Regulator
  • Characteristics: Low Dropout, Negative Output
  • Package: TO-220F
  • Essence: Monolithic IC with 3-Terminal Regulator
  • Packaging/Quantity: Tape and Reel / 2,500 units per reel

Specifications

  • Input Voltage Range: -35V to -10V
  • Output Voltage: -9V
  • Output Current: 0.5A
  • Dropout Voltage: 1.2V (typical)
  • Quiescent Current: 5mA (typical)
  • Ripple Rejection: 60dB (typical)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NJM79M09FA has a standard 3-pin configuration:

  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 output voltage.

Functional Features

  • Voltage Regulation: The NJM79M09FA regulates the output voltage to a stable -9V, even when the input voltage varies.
  • Low Dropout: With a dropout voltage of only 1.2V, this regulator can operate efficiently even with low input-output differentials.
  • Short Circuit Protection: The IC incorporates short circuit protection, preventing damage to the device in case of a short circuit at the output.
  • Thermal Shutdown: In case of excessive temperature, the NJM79M09FA shuts down to protect itself from overheating.

Advantages and Disadvantages

Advantages

  • Compact and easy-to-use package.
  • Low dropout voltage ensures efficient operation.
  • Built-in short circuit protection enhances reliability.
  • Wide operating temperature range allows for versatile applications.

Disadvantages

  • Limited output current capacity (0.5A).
  • Negative output voltage may not be suitable for all applications.
  • Requires external capacitors for stability.

Working Principles

The NJM79M09FA is a monolithic integrated circuit that utilizes a negative linear voltage regulator topology. It takes an input voltage within the range of -35V to -10V and provides a regulated -9V output. The internal circuitry consists of a voltage reference, error amplifier, pass transistor, and current limiting circuit. By comparing the reference voltage with the feedback voltage, the error amplifier adjusts the pass transistor to maintain a constant output voltage.

Detailed Application Field Plans

The NJM79M09FA finds applications in various fields, including:

  1. Industrial Electronics: Power supplies for industrial control systems.
  2. Automotive: Voltage regulation for automotive electronic systems.
  3. Telecommunications: Regulating voltages in telecommunication equipment.
  4. Consumer Electronics: Power management in audio/video devices, gaming consoles, etc.
  5. Medical Devices: Voltage regulation in medical equipment.

Detailed and Complete Alternative Models

  1. LM79M09: Similar negative voltage regulator with a TO-220 package.
  2. MC79M09: Negative voltage regulator with higher output current capability.
  3. LT1963A-9: Adjustable negative voltage regulator with low dropout voltage.

These alternative models offer similar functionality and can be considered as substitutes for the NJM79M09FA in specific applications.

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Énumérez 10 questions et réponses courantes liées à l'application de NJM79M09FA dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of NJM79M09FA in technical solutions:

  1. Q: What is NJM79M09FA? A: NJM79M09FA is a voltage regulator IC that provides a fixed output voltage of -9V.

  2. Q: What is the input voltage range for NJM79M09FA? A: The input voltage range for NJM79M09FA is typically between -11V and -35V.

  3. Q: What is the maximum output current of NJM79M09FA? A: The maximum output current of NJM79M09FA is 500mA.

  4. Q: Can NJM79M09FA be used to regulate positive voltages? A: No, NJM79M09FA is specifically designed for regulating negative voltages.

  5. Q: What are the typical applications of NJM79M09FA? A: NJM79M09FA is commonly used in audio amplifiers, power supplies, and other electronic circuits requiring a stable -9V voltage.

  6. Q: Does NJM79M09FA require any external components for operation? A: Yes, NJM79M09FA requires input and output capacitors for stability and filtering purposes.

  7. Q: What is the thermal shutdown feature of NJM79M09FA? A: NJM79M09FA has built-in thermal shutdown protection that prevents the IC from overheating by shutting down when the temperature exceeds a certain threshold.

  8. Q: Can NJM79M09FA handle short-circuit conditions? A: Yes, NJM79M09FA has built-in short-circuit protection that limits the output current to protect the IC from damage.

  9. Q: What is the operating temperature range of NJM79M09FA? A: The operating temperature range of NJM79M09FA is typically between -40°C and +85°C.

  10. Q: Is NJM79M09FA available in different package types? A: Yes, NJM79M09FA is available in various package types such as TO-220, TO-252, and DPAK, providing flexibility for different PCB layouts and applications.

Please note that these answers are general and may vary depending on the specific datasheet and manufacturer's specifications for NJM79M09FA.