STMicroelectronics
Afbeelding kan een representatie zijn.
Zie specificaties voor productdetails.
L79L12ACUTR
Details bekijken DataSheets

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.

Word count: 345 words

Noem 10 veelgestelde vragen en antwoorden met betrekking tot de toepassing van L79L12ACUTR in technische oplossingen

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.