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L4940V5
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L4940V5

Product Overview

  • Category: Voltage Regulator
  • Use: To regulate and stabilize the output voltage in electronic circuits.
  • Characteristics: High precision, low dropout voltage, high current capability.
  • Package: TO-220
  • Essence: Linear voltage regulator
  • Packaging/Quantity: Available in reels of 2,500 units

Specifications

  • Input Voltage Range: 7V to 35V
  • Output Voltage: 5V
  • Output Current: Up to 1.5A
  • Dropout Voltage: 1.2V (typical)
  • Line Regulation: 0.04% (typical)
  • Load Regulation: 0.3% (typical)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L4940V5 has three pins:

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

Functional Features

  • High Precision: The L4940V5 offers a highly accurate output voltage of 5V, ensuring stable performance in various applications.
  • Low Dropout Voltage: With a dropout voltage as low as 1.2V, this regulator can maintain a stable output even when the input voltage is close to the desired output voltage.
  • High Current Capability: Capable of delivering up to 1.5A of continuous output current, making it suitable for power-hungry devices.
  • Thermal Shutdown Protection: Built-in thermal shutdown protection prevents the device from overheating, ensuring safe operation.

Advantages and Disadvantages

Advantages

  • High precision and stability in voltage regulation.
  • Low dropout voltage allows for efficient power conversion.
  • Can handle high current loads.
  • Thermal shutdown protection ensures safe operation.

Disadvantages

  • Requires external capacitors for stability.
  • Limited output voltage options (fixed at 5V).

Working Principles

The L4940V5 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 output voltage. The dropout voltage is minimized by using a low resistance pass element.

Detailed Application Field Plans

The L4940V5 is commonly used in various electronic devices and applications, including:

  1. Power supplies for microcontrollers and digital circuits.
  2. Battery-powered devices requiring a stable 5V supply.
  3. Automotive electronics, such as car audio systems and navigation units.
  4. Industrial control systems and automation equipment.
  5. Consumer electronics, including TVs, DVD players, and gaming consoles.

Detailed and Complete Alternative Models

  1. LM7805: A popular alternative with similar specifications and pin configuration.
  2. LT1085: Offers adjustable output voltage and higher current capability.
  3. LM317: Adjustable voltage regulator with a wide input voltage range.

These alternative models provide flexibility in terms of output voltage options and current handling capabilities, catering to different application requirements.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací L4940V5 v technických řešeních

Sure! Here are 10 common questions and answers related to the application of L4940V5 in technical solutions:

  1. Q: What is the L4940V5? A: The L4940V5 is a voltage regulator IC that provides a fixed output voltage of 5V.

  2. Q: What is the maximum input voltage for the L4940V5? A: The maximum input voltage for the L4940V5 is 35V.

  3. Q: What is the maximum output current of the L4940V5? A: The maximum output current of the L4940V5 is 1.5A.

  4. Q: Can the L4940V5 be used to regulate voltages other than 5V? A: No, the L4940V5 is specifically designed to provide a fixed output voltage of 5V.

  5. Q: Is the L4940V5 suitable for low-power applications? A: No, the L4940V5 is designed for medium to high power applications due to its maximum output current of 1.5A.

  6. Q: Does the L4940V5 require any external components for operation? A: Yes, the L4940V5 requires input and output capacitors for stability and filtering.

  7. Q: Can the L4940V5 handle short-circuit conditions? A: Yes, the L4940V5 has built-in protection features that allow it to handle short-circuit conditions without damage.

  8. Q: What is the dropout voltage of the L4940V5? A: The dropout voltage of the L4940V5 is typically around 1.2V at full load.

  9. Q: Can the L4940V5 be used in automotive applications? A: Yes, the L4940V5 is suitable for automotive applications as it can handle a wide input voltage range and has built-in protection features.

  10. Q: What is the thermal resistance of the L4940V5? A: The thermal resistance of the L4940V5 is typically around 3°C/W, which determines its ability to dissipate heat.

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