STMicroelectronics
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L4947L
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L4947L

Product Overview

  • Category: Integrated Circuit
  • Use: Voltage Regulator
  • Characteristics: Low Dropout, Adjustable Output Voltage
  • Package: TO-220
  • Essence: Linear Voltage Regulator
  • Packaging/Quantity: Tape and Reel, 1000 units per reel

Specifications

  • Input Voltage Range: 4.5V to 26V
  • Output Voltage Range: 1.2V to 20V
  • Output Current: Up to 1A
  • Dropout Voltage: 0.6V (typical)
  • Quiescent Current: 75µA (typical)
  • Line Regulation: ±0.2% (typical)
  • Load Regulation: ±0.3% (typical)
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L4947L has the following pin configuration:

  1. GND (Ground)
  2. Vout (Output Voltage)
  3. Vin (Input Voltage)
  4. Adj (Adjustment Pin)

Functional Features

  • Low dropout voltage ensures efficient regulation even with small input-output voltage differentials.
  • Adjustable output voltage allows for flexibility in various applications.
  • Excellent line and load regulation provide stable output voltage under varying conditions.
  • Internal thermal shutdown protection prevents damage due to excessive temperature.
  • Short-circuit current limiting protects the device and connected components from overcurrent situations.

Advantages and Disadvantages

Advantages

  • Low dropout voltage enables efficient power conversion.
  • Adjustable output voltage suits a wide range of applications.
  • Good line and load regulation ensure stable performance.
  • Thermal shutdown protection prevents overheating.
  • Short-circuit current limiting enhances safety.

Disadvantages

  • Limited output current capacity (up to 1A).
  • Requires external components for proper operation.
  • Higher quiescent current compared to some other voltage regulators.

Working Principles

The L4947L is a linear voltage regulator that utilizes a pass transistor to regulate the output voltage. It operates by comparing the reference voltage with a fraction of the output voltage through a feedback network. The error amplifier drives the pass transistor to maintain the desired output voltage, compensating for load and line variations.

Detailed Application Field Plans

The L4947L is suitable for various applications requiring regulated power supply. Some potential application fields include:

  1. Automotive electronics
  2. Industrial control systems
  3. Consumer electronics
  4. Telecommunications equipment
  5. Battery-powered devices

Detailed and Complete Alternative Models

  1. LM317: Adjustable Linear Voltage Regulator
  2. LT1084: Low Dropout Positive Fixed Voltage Regulator
  3. LM1117: Low Dropout Linear Voltage Regulator
  4. LM7805: Fixed Output Positive Voltage Regulator
  5. LM2940: Low Dropout Adjustable Voltage Regulator

These alternative models offer similar functionality and can be considered as substitutes for the L4947L in different applications.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací L4947L v technických řešeních

  1. What is the application of L4947L in technical solutions?
    - The L4947L is commonly used as a voltage regulator in various technical solutions to provide stable power supply.

  2. How does L4947L contribute to improving system reliability?
    - The L4947L helps improve system reliability by regulating and stabilizing the voltage, thus preventing fluctuations that could potentially damage sensitive components.

  3. Can L4947L be used in automotive applications?
    - Yes, the L4947L is suitable for automotive applications due to its robust design and ability to withstand harsh operating conditions.

  4. What are the key features of L4947L that make it suitable for industrial use?
    - The L4947L's wide input voltage range, high efficiency, and thermal protection make it well-suited for industrial applications.

  5. Is L4947L compatible with both analog and digital circuits?
    - Yes, the L4947L can be used with both analog and digital circuits, making it versatile for a wide range of applications.

  6. How does L4947L help in reducing power consumption?
    - The L4947L's low dropout voltage and high efficiency contribute to reducing overall power consumption in a system.

  7. Can L4947L be used in battery-powered devices?
    - Yes, the L4947L is suitable for battery-powered devices, as it can efficiently regulate voltage from varying input sources.

  8. What are the typical output voltage options available for L4947L?
    - The L4947L is available in various fixed output voltage options, such as 3.3V, 5V, and 12V, catering to different application requirements.

  9. Does L4947L require external components for operation?
    - The L4947L requires minimal external components for operation, simplifying the design and reducing overall system cost.

  10. How does L4947L handle overcurrent and overtemperature conditions?
    - The L4947L incorporates overcurrent and overtemperature protection features to safeguard the device and the connected circuitry during fault conditions.