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NJM7918FA
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NJM7918FA

Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Regulator
  • Characteristics:
    • Package: TO-220
    • Essence: Negative Voltage Regulator
    • Packaging/Quantity: Tape and Reel, 2,500 units per reel

Specifications

  • Output Voltage: -18V
  • Output Current: 1A
  • Input Voltage Range: -35V to -10V
  • Dropout Voltage: 2V
  • Quiescent Current: 5mA
  • Operating Temperature Range: -40°C to +125°C

Pin Configuration

The NJM7918FA has a standard TO-220 package with three pins:

  1. Pin 1: Input Voltage (VIN)
  2. Pin 2: Ground (GND)
  3. Pin 3: Output Voltage (VOUT)

Functional Features

  • Provides a stable -18V output voltage.
  • Low dropout voltage ensures efficient regulation even with low input voltages.
  • Built-in thermal shutdown protection prevents overheating.
  • Short circuit protection safeguards the IC and connected components.

Advantages

  • High accuracy and stability in regulating negative voltages.
  • Wide input voltage range allows for versatile applications.
  • Compact TO-220 package enables easy integration into various circuits.
  • Excellent thermal management ensures reliable operation.

Disadvantages

  • Limited output current of 1A may not be sufficient for high-power applications.
  • Dropout voltage of 2V may result in higher power dissipation.

Working Principles

The NJM7918FA is a negative voltage regulator that utilizes a series pass transistor to maintain a constant -18V output voltage. It operates by comparing the reference voltage with the feedback voltage from the output, adjusting the pass transistor's resistance to regulate the output voltage.

Application Field Plans

The NJM7918FA is commonly used in various electronic devices and circuits that require a stable -18V power supply. Some typical application fields include:

  1. Audio Amplifiers
  2. Industrial Control Systems
  3. Test and Measurement Equipment
  4. Automotive Electronics
  5. Power Supply Modules

Alternative Models

  • LM7918: Negative voltage regulator with similar specifications.
  • MC7918: Negative voltage regulator with enhanced thermal protection.
  • KA7918: Negative voltage regulator with higher output current capability.

Note: These alternative models may have slight variations in characteristics and pin configuration. It is recommended to refer to their respective datasheets for detailed information.

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Перечислите 10 распространенных вопросов и ответов, связанных с применением NJM7918FA в технических решениях.

Sure! Here are 10 common questions and answers related to the application of NJM7918FA in technical solutions:

  1. Q: What is NJM7918FA? A: NJM7918FA is a voltage regulator IC that provides a fixed output voltage of -18V.

  2. Q: What is the input voltage range for NJM7918FA? A: The input voltage range for NJM7918FA is typically between -20V and -35V.

  3. Q: What is the maximum output current of NJM7918FA? A: The maximum output current of NJM7918FA is 1A.

  4. Q: Can NJM7918FA be used in both AC and DC applications? A: Yes, NJM7918FA can be used in both AC and DC applications.

  5. Q: Is NJM7918FA suitable for high-power applications? A: No, NJM7918FA is not suitable for high-power applications as its maximum output current is limited to 1A.

  6. Q: Does NJM7918FA require any external components for operation? A: Yes, NJM7918FA requires input and output capacitors for stable operation.

  7. Q: Can NJM7918FA handle overvoltage protection? A: No, NJM7918FA does not have built-in overvoltage protection. External protection circuitry may be required.

  8. Q: What is the typical dropout voltage of NJM7918FA? A: The typical dropout voltage of NJM7918FA is around 2V.

  9. Q: Can NJM7918FA be used in automotive applications? A: Yes, NJM7918FA can be used in automotive applications as long as the input voltage range is within its specified limits.

  10. Q: Are there any recommended heat dissipation techniques for NJM7918FA? A: Yes, it is recommended to use a heatsink or thermal pad to dissipate heat generated by NJM7918FA, especially when operating at high currents or in high-temperature environments.

Please note that these answers are general and may vary depending on the specific application and requirements.