NJR Corporation/NJRC
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NJM79L18A
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NJM79L18A

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Regulator
  • Characteristics: Low Dropout, Negative Voltage Output
  • Package: TO-92
  • Essence: Linear Regulator
  • Packaging/Quantity: Tape and Reel, 2000 units per reel

Specifications

  • Input Voltage Range: -35V to -10V
  • Output Voltage: -18V
  • Output Current: 100mA
  • Dropout Voltage: 1.7V (typical)
  • Quiescent Current: 5mA (typical)

Detailed Pin Configuration

The NJM79L18A 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 -18V output.

Functional Features

  • Voltage Regulation: The NJM79L18A regulates the input voltage to a stable -18V output.
  • Low Dropout: It operates with a low dropout voltage of 1.7V, ensuring efficient power conversion.
  • Short Circuit Protection: The IC includes built-in protection against short circuits, preventing damage to the device.
  • Thermal Shutdown: In case of excessive heat, the regulator shuts down to prevent overheating and potential damage.

Advantages and Disadvantages

Advantages

  • Compact and easy-to-use package (TO-92).
  • Low dropout voltage ensures efficient power conversion.
  • Built-in short circuit protection enhances reliability.
  • Thermal shutdown feature prevents overheating.

Disadvantages

  • Limited output current capability (100mA).
  • Restricted input voltage range (-35V to -10V).

Working Principles

The NJM79L18A is a linear voltage regulator that uses a negative feedback mechanism to maintain a stable -18V output voltage. It operates by comparing the output voltage with a reference voltage and adjusting the internal circuitry to regulate the output within the specified range. The dropout voltage is minimized, allowing for efficient power conversion.

Detailed Application Field Plans

The NJM79L18A finds applications in various electronic devices where a stable -18V voltage supply is required. Some common application fields include:

  1. Audio Amplifiers: Provides a regulated negative voltage supply for audio amplification circuits.
  2. Instrumentation: Used in measurement equipment that requires a precise -18V reference voltage.
  3. Automotive Electronics: Suitable for automotive applications requiring a negative voltage source, such as sensors and control systems.
  4. Telecommunications: Used in telecommunication devices that require a regulated -18V power supply.

Detailed and Complete Alternative Models

  • LM79L18: Similar characteristics and specifications, available in different package options.
  • MC79L18: Comparable performance, alternative manufacturer option.
  • KA79L18: Equivalent functionality, offered by another manufacturer.

(Note: This list is not exhaustive and other alternative models may exist.)

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af NJM79L18A i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of NJM79L18A in technical solutions:

  1. Q: What is NJM79L18A? A: NJM79L18A is a voltage regulator IC that provides a fixed output voltage of -18V.

  2. Q: What is the input voltage range for NJM79L18A? A: The input voltage range for NJM79L18A is typically between -35V to -5V.

  3. Q: What is the maximum output current of NJM79L18A? A: The maximum output current of NJM79L18A is 100mA.

  4. Q: Can NJM79L18A be used in both AC and DC applications? A: Yes, NJM79L18A can be used in both AC and DC applications.

  5. Q: Is it necessary to use an external capacitor with NJM79L18A? A: Yes, it is recommended to use an external capacitor for stability and noise reduction. A 0.33μF ceramic capacitor is commonly used.

  6. Q: Can NJM79L18A handle short-circuit conditions? A: No, NJM79L18A does not have built-in short-circuit protection. It is advisable to use an external current-limiting resistor to protect the IC.

  7. Q: What is the operating temperature range for NJM79L18A? A: The operating temperature range for NJM79L18A is typically between -40°C to +125°C.

  8. Q: Can NJM79L18A be used in battery-powered applications? A: Yes, NJM79L18A can be used in battery-powered applications as it has low quiescent current consumption.

  9. Q: Can NJM79L18A be used in automotive applications? A: Yes, NJM79L18A can be used in automotive applications as it meets the necessary requirements for automotive electronics.

  10. Q: Are there any alternatives to NJM79L18A with similar specifications? A: Yes, some alternatives to NJM79L18A include LM79L18, MC79L18, and UA79L18, which are voltage regulators with a fixed -18V output.

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