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L79L12ACUTR
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L79L12ACUTR

Product Overview

  • Category: Voltage Regulator
  • Use: To regulate and stabilize the output voltage in electronic circuits
  • Characteristics: Low dropout, fixed negative voltage regulator
  • Package: TO-220, DPAK, or SO-8 package
  • Essence: Integrated circuit (IC) voltage regulator
  • Packaging/Quantity: Available in reels or tubes, quantity varies based on manufacturer

Specifications

  • Input Voltage: Up to -35V
  • Output Voltage: -12V
  • Output Current: Up to 100mA
  • Dropout Voltage: Typically 1.7V at 100mA
  • Operating Temperature Range: -40°C to +125°C
  • Line Regulation: Typically 0.04%/V
  • Load Regulation: Typically 0.3%
  • Ripple Rejection: Typically 60dB
  • Quiescent Current: Typically 4.5mA

Detailed Pin Configuration

The L79L12ACUTR voltage regulator has three pins:

  1. Input Pin (VIN): Connects to the input voltage source.
  2. Ground Pin (GND): Connected to the ground reference of the circuit.
  3. Output Pin (VOUT): Provides the regulated -12V output voltage.

Functional Features

  • Voltage Regulation: The L79L12ACUTR maintains a stable -12V output voltage regardless of variations in the input voltage or load conditions.
  • Low Dropout: With a low dropout voltage of typically 1.7V, it can operate efficiently even when the input voltage is close to the desired output voltage.
  • Short Circuit Protection: The device includes internal current limiting and thermal shutdown protection to prevent damage in case of a short circuit or excessive temperature.

Advantages and Disadvantages

Advantages: - Provides a stable -12V output voltage for various electronic applications. - Low dropout voltage enables efficient operation even with low input voltages. - Internal protection features enhance reliability and prevent damage.

Disadvantages: - Limited output current capability (up to 100mA). - Requires external capacitors for stability in some applications.

Working Principles

The L79L12ACUTR is a fixed negative voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the reference voltage with a fraction of the output voltage and adjusts the pass transistor accordingly to maintain a constant -12V output.

Detailed Application Field Plans

The L79L12ACUTR is commonly used in various electronic devices and circuits, including:

  1. Power Supplies: Provides a stable -12V voltage rail for powering analog and digital circuits.
  2. Audio Amplifiers: Used as a negative power supply to bias audio amplifier stages.
  3. Instrumentation Systems: Ensures a regulated -12V supply for accurate measurements.
  4. Automotive Electronics: Used in automotive applications requiring a regulated negative voltage.

Detailed and Complete Alternative Models

  1. LM7912: Negative voltage regulator with similar specifications and pin configuration.
  2. MC79L12: Another negative voltage regulator with comparable characteristics.
  3. LT1963A-12: High-performance negative voltage regulator with lower dropout voltage.

These alternative models can be considered based on specific application requirements and availability.

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技術ソリューションにおける L79L12ACUTR の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of L79L12ACUTR in technical solutions:

  1. Q: What is L79L12ACUTR? A: L79L12ACUTR is a voltage regulator IC that provides a fixed output voltage of -12V.

  2. Q: What is the input voltage range for L79L12ACUTR? A: The input voltage range for L79L12ACUTR is typically between -35V and -15V.

  3. Q: What is the maximum output current of L79L12ACUTR? A: The maximum output current of L79L12ACUTR is 100mA.

  4. Q: Can L79L12ACUTR be used in both AC and DC applications? A: Yes, L79L12ACUTR can be used in both AC and DC applications.

  5. Q: Is L79L12ACUTR suitable for automotive applications? A: No, L79L12ACUTR is not suitable for automotive applications as it operates within a limited temperature range.

  6. Q: Can L79L12ACUTR be used to regulate positive voltages? A: No, L79L12ACUTR is specifically designed to regulate negative voltages.

  7. Q: What is the typical dropout voltage of L79L12ACUTR? A: The typical dropout voltage of L79L12ACUTR is around 2V.

  8. Q: Does L79L12ACUTR require any external components for operation? A: Yes, L79L12ACUTR requires an input capacitor and an output capacitor for stable operation.

  9. Q: Can L79L12ACUTR be used in high-frequency applications? A: No, L79L12ACUTR is not suitable for high-frequency applications as it has limited bandwidth.

  10. Q: What are the typical applications of L79L12ACUTR? A: L79L12ACUTR is commonly used in audio amplifiers, power supplies, and other low-power electronic circuits that require a regulated -12V output voltage.

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