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AN79L12
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AN79L12

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Regulator
  • Characteristics: Low dropout, fixed output voltage
  • Package: TO-92
  • Essence: Linear regulator
  • Packaging/Quantity: Bulk packaging, 100 units per pack

Specifications

  • Input Voltage Range: 14V to 35V
  • Output Voltage: -12V
  • Output Current: 100mA
  • Dropout Voltage: 2V
  • Quiescent Current: 5mA
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

AN79L12 has three pins:

  1. Input (IN): Connects to the input voltage source.
  2. Ground (GND): Connected to the ground reference.
  3. Output (OUT): Provides the regulated -12V output.

Functional Features

  • Low dropout voltage: The AN79L12 has a low dropout voltage of 2V, allowing it to regulate the output voltage even when the input voltage is close to the desired output voltage.
  • Fixed output voltage: The AN79L12 provides a fixed -12V output voltage, ensuring a stable power supply for connected devices.
  • Thermal shutdown protection: The IC includes thermal shutdown protection, which prevents damage due to excessive temperature.
  • Short-circuit protection: The AN79L12 is equipped with short-circuit protection, safeguarding the circuit from damage in case of a short circuit.

Advantages and Disadvantages

Advantages: - Low dropout voltage ensures efficient regulation. - Fixed output voltage provides stability. - Thermal shutdown and short-circuit protection enhance reliability.

Disadvantages: - Limited output current of 100mA may not be suitable for high-power applications. - Requires external capacitors for stability.

Working Principles

The AN79L12 is a linear voltage regulator that uses a pass transistor to regulate the output voltage. It compares the reference voltage with the feedback voltage and adjusts the pass transistor accordingly to maintain a stable -12V output.

Detailed Application Field Plans

The AN79L12 is commonly used in various electronic devices that require a regulated -12V power supply. Some typical applications include:

  1. Audio Amplifiers: The AN79L12 can be used to provide a stable -12V supply for audio amplifiers, ensuring high-quality sound reproduction.
  2. Industrial Control Systems: It can be utilized in industrial control systems to regulate the voltage for sensors, actuators, and other components.
  3. Automotive Electronics: The AN79L12 finds application in automotive electronics, such as car audio systems or dashboard displays, where a regulated -12V supply is required.

Detailed and Complete Alternative Models

  1. LM7912: Similar to AN79L12, but with a different package (TO-220) and higher output current capability (up to 1A).
  2. MC79L12: Another alternative with a TO-92 package, providing a fixed -12V output voltage and similar specifications to AN79L12.

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Enumere 10 preguntas y respuestas comunes relacionadas con la aplicación de AN79L12 en soluciones técnicas

Sure! Here are 10 common questions and answers related to the application of AN79L12 in technical solutions:

  1. Q: What is AN79L12? A: AN79L12 is a voltage regulator IC (integrated circuit) that provides a fixed negative output voltage of -12V.

  2. Q: What is the purpose of using AN79L12 in technical solutions? A: AN79L12 is commonly used to regulate and stabilize the negative voltage supply in various electronic circuits and systems.

  3. Q: What is the input voltage range for AN79L12? A: The input voltage range for AN79L12 typically varies from -14V to -35V.

  4. Q: What is the maximum output current that AN79L12 can handle? A: AN79L12 can handle a maximum output current of 100mA.

  5. Q: Can AN79L12 be used in both AC and DC applications? A: Yes, AN79L12 can be used in both AC and DC applications as long as the input voltage falls within the specified range.

  6. Q: Is it necessary to use external components with AN79L12? A: Yes, AN79L12 requires external capacitors for stability and proper operation. A minimum input capacitor and an output capacitor are recommended.

  7. Q: Can AN79L12 tolerate overvoltage or reverse polarity? A: No, AN79L12 is not designed to tolerate overvoltage or reverse polarity. It is important to ensure correct polarity and protect against overvoltage conditions.

  8. Q: What is the typical dropout voltage of AN79L12? A: The typical dropout voltage of AN79L12 is around 2V, meaning the input voltage must be at least 2V higher than the desired output voltage.

  9. Q: Can AN79L12 handle short-circuit conditions? A: AN79L12 has built-in thermal shutdown protection, which helps protect it from damage during short-circuit conditions. However, it is still recommended to avoid prolonged short circuits.

  10. Q: Are there any specific precautions to consider when using AN79L12? A: Yes, some precautions include proper heat sinking, avoiding excessive input voltage, ensuring correct polarity, and following the manufacturer's datasheet for recommended usage guidelines.

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