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NJM79L12UA
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NJM79L12UA

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Regulator
  • Characteristics: Low dropout voltage, high ripple rejection, compact size
  • Package: TO-92 (3-pin package)
  • Essence: Linear voltage regulator
  • Packaging/Quantity: Available in reels of 2,500 units

Specifications

  • Input Voltage Range: -35V to -12.5V
  • Output Voltage: -12V
  • Output Current: 100mA
  • Dropout Voltage: 1.2V (typical)
  • Ripple Rejection Ratio: 60dB (typical)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The NJM79L12UA has three pins:

  1. INPUT (Pin 1): Connects to the input voltage source.
  2. GROUND (Pin 2): Connected to the ground reference.
  3. OUTPUT (Pin 3): Provides the regulated output voltage.

Functional Features

  • Voltage Regulation: The NJM79L12UA maintains a stable output voltage of -12V regardless of variations in the input voltage or load conditions.
  • Low Dropout Voltage: With a dropout voltage as low as 1.2V, this voltage regulator can operate efficiently even when the input voltage is close to the desired output voltage.
  • High Ripple Rejection: The IC exhibits excellent rejection of input voltage ripples, ensuring a clean and stable output voltage.
  • Thermal Shutdown Protection: The device incorporates thermal shutdown circuitry that protects it from excessive heat, preventing damage to the IC.

Advantages and Disadvantages

Advantages: - Compact Size: The TO-92 package makes it suitable for space-constrained applications. - Easy to Use: The three-pin configuration simplifies the integration process. - Wide Operating Temperature Range: Can withstand extreme temperature conditions.

Disadvantages: - Limited Output Current: The NJM79L12UA is designed for low-power applications and can only provide a maximum output current of 100mA. - Fixed Output Voltage: The regulator provides a fixed -12V output, limiting its versatility in certain applications.

Working Principles

The NJM79L12UA is a linear voltage regulator that utilizes a negative feedback mechanism to maintain a constant output voltage. It compares the output voltage with a reference voltage and adjusts the internal circuitry to compensate for any variations. By dissipating excess voltage as heat, it ensures a stable -12V output.

Detailed Application Field Plans

The NJM79L12UA finds applications in various electronic devices, including:

  1. Audio Amplifiers: Provides a stable power supply for audio amplification circuits.
  2. Instrumentation Systems: Used to regulate voltages in measurement and control systems.
  3. Automotive Electronics: Suitable for automotive applications requiring a regulated -12V supply.
  4. Battery-Powered Devices: Can be used to power low-power battery-operated devices.

Detailed and Complete Alternative Models

  1. LM79L12: Manufactured by Texas Instruments, this IC offers similar specifications and pin configuration.
  2. MC79L12: Produced by ON Semiconductor, it provides comparable performance and compatibility with the NJM79L12UA.
  3. KA79L12: A voltage regulator from Fairchild Semiconductor, offering a drop-in replacement for the NJM79L12UA.

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

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Lista 10 Vanliga frågor och svar relaterade till tillämpningen av NJM79L12UA i tekniska lösningar

Sure! Here are 10 common questions and answers related to the application of NJM79L12UA in technical solutions:

  1. Q: What is NJM79L12UA? A: NJM79L12UA is a voltage regulator IC that provides a fixed output voltage of -12V.

  2. Q: What is the input voltage range for NJM79L12UA? A: The input voltage range for NJM79L12UA is typically between -35V to -15V.

  3. Q: What is the maximum output current of NJM79L12UA? A: The maximum output current of NJM79L12UA is 100mA.

  4. Q: Can NJM79L12UA be used as a positive voltage regulator? A: No, NJM79L12UA is specifically designed as a negative voltage regulator.

  5. Q: What are the typical applications of NJM79L12UA? A: NJM79L12UA is commonly used in various electronic devices where a stable -12V power supply is required, such as audio amplifiers, industrial control systems, and instrumentation.

  6. Q: How does NJM79L12UA regulate the output voltage? A: NJM79L12UA uses an internal voltage reference and feedback mechanism to maintain a constant -12V output voltage regardless of changes in input voltage or load conditions.

  7. Q: Does NJM79L12UA require any external components for operation? A: Yes, NJM79L12UA requires a minimum of two external capacitors (input and output) for stability and proper operation.

  8. Q: What is the thermal shutdown feature of NJM79L12UA? A: NJM79L12UA has built-in thermal shutdown protection that automatically shuts down the device if the temperature exceeds a certain threshold, preventing damage due to overheating.

  9. Q: Can NJM79L12UA handle short-circuit conditions? A: Yes, NJM79L12UA has built-in current limiting and short-circuit protection, which helps protect the device from excessive current flow during short-circuit events.

  10. Q: Is NJM79L12UA available in different package options? A: Yes, NJM79L12UA is available in various package options, including TO-92, SOT-89, 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 of NJM79L12UA.