STMicroelectronics
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L78L12ACZ
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L78L12ACZ

Product Overview

  • Category: Voltage Regulator
  • Use: To regulate and stabilize the output voltage in electronic circuits
  • Characteristics:
    • Fixed output voltage of 12V
    • Low dropout voltage
    • High ripple rejection
    • Short-circuit protection
  • Package: TO-92 (Through-Hole)
  • Essence: Linear voltage regulator
  • Packaging/Quantity: Available in reels or tubes, quantity varies based on manufacturer

Specifications

  • Input Voltage Range: 14V to 35V
  • Output Voltage: 12V
  • Output Current: Up to 100mA
  • Dropout Voltage: 2V (maximum)
  • Ripple Rejection: 60dB (typical)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L78L12ACZ voltage regulator has three pins:

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

Functional Features

  • Regulates the output voltage to a fixed 12V regardless of input variations.
  • Provides a stable power supply for various electronic components.
  • Protects against short-circuits, preventing damage to the circuitry.
  • Filters out ripple and noise from the input voltage, ensuring a clean output.

Advantages and Disadvantages

Advantages: - Simple and easy to use. - Cost-effective solution for voltage regulation. - Wide operating temperature range allows for versatile applications. - Short-circuit protection enhances circuit reliability.

Disadvantages: - Limited output current capability (up to 100mA). - Dropout voltage may cause inefficiency in low input voltage scenarios.

Working Principles

The L78L12ACZ is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It compares the output voltage with a reference voltage and adjusts the pass transistor accordingly to maintain a stable 12V output. The regulator operates in a "dropout" mode, where the input voltage must be at least 2V higher than the desired output voltage for proper regulation.

Detailed Application Field Plans

The L78L12ACZ is commonly used in various electronic applications, including:

  1. Power Supply Units (PSUs): Provides regulated voltage to power sensitive components.
  2. Audio Amplifiers: Stabilizes the power supply for audio amplification circuits.
  3. Microcontroller Systems: Ensures a stable voltage for microcontrollers and other digital ICs.
  4. Automotive Electronics: Regulates voltage for automotive sensors, actuators, and control systems.
  5. Battery Charging Circuits: Controls the charging voltage for batteries in portable devices.

Detailed and Complete Alternative Models

  • LM7812: Similar fixed 12V linear voltage regulator with higher output current capability.
  • LT1086: Adjustable linear voltage regulator with a wide input voltage range.
  • LM317: Adjustable linear voltage regulator with higher output current capability.

Note: This entry provides a brief overview of the L78L12ACZ voltage regulator. For more detailed information, please refer to the datasheet provided by the manufacturer.

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Énumérez 10 questions et réponses courantes liées à l'application de L78L12ACZ dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of L78L12ACZ in technical solutions:

  1. Q: What is L78L12ACZ? A: L78L12ACZ is a voltage regulator IC (integrated circuit) that provides a fixed output voltage of +12V.

  2. Q: What is the input voltage range for L78L12ACZ? A: The input voltage range for L78L12ACZ is typically between 14V and 35V.

  3. Q: What is the maximum output current of L78L12ACZ? A: The maximum output current of L78L12ACZ is 100mA.

  4. Q: Can L78L12ACZ be used to regulate voltages other than +12V? A: No, L78L12ACZ is specifically designed to provide a fixed output voltage of +12V.

  5. Q: Is L78L12ACZ suitable for low-power applications? A: Yes, L78L12ACZ is commonly used in low-power applications where a regulated +12V supply is required.

  6. Q: Does L78L12ACZ require any external components for operation? A: Yes, L78L12ACZ requires at least two external capacitors (input and output capacitors) for stable operation.

  7. Q: Can L78L12ACZ handle high temperatures? A: L78L12ACZ has a maximum operating temperature of 125°C, making it suitable for many industrial and automotive applications.

  8. Q: Can L78L12ACZ tolerate reverse polarity on its input? A: No, L78L12ACZ is not designed to handle reverse polarity. Reverse polarity can damage the IC.

  9. Q: Can L78L12ACZ be used in battery-powered applications? A: Yes, L78L12ACZ can be used in battery-powered applications as long as the input voltage is within its specified range.

  10. Q: Are there any alternatives to L78L12ACZ for +12V voltage regulation? A: Yes, there are other voltage regulator ICs available in the market that can provide a regulated +12V output, such as LM7812 or UA7812.

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