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L4978
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L4978 Voltage Regulator

Product Category

The L4978 is a voltage regulator belonging to the category of linear regulators.

Basic Information Overview

  • Use: The L4978 is used to regulate voltage in electronic circuits, ensuring a stable output voltage regardless of input fluctuations.
  • Characteristics: It offers high precision and low dropout voltage, making it suitable for various applications.
  • Package: The L4978 comes in a TO-220 package, which provides efficient heat dissipation.
  • Essence: Its essence lies in providing a reliable and stable voltage output for electronic devices.
  • Packaging/Quantity: Typically, the L4978 is available in reels or tubes containing a specific quantity per package.

Specifications

  • Input Voltage Range: 4.4V to 60V
  • Output Voltage Range: 1.2V to 57V
  • Output Current: Up to 1.5A
  • Dropout Voltage: 1.3V at 1.5A
  • Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The L4978 has a standard pin configuration with input, output, and ground pins, along with additional pins for control and feedback.

Functional Features

  • High Precision: Provides accurate and stable output voltage regulation.
  • Low Dropout Voltage: Ensures efficient operation even when the input voltage is close to the output voltage.
  • Overcurrent Protection: Safeguards the circuit by limiting the output current during overloads.

Advantages and Disadvantages

Advantages

  • Reliable voltage regulation
  • Wide input voltage range
  • Low dropout voltage
  • Overcurrent protection

Disadvantages

  • Limited output current compared to some other regulators
  • Higher power dissipation under heavy loads

Working Principles

The L4978 operates by comparing the actual output voltage with a reference voltage and adjusting the internal circuitry to maintain a constant output voltage. It utilizes a feedback mechanism to continuously monitor and regulate the output voltage.

Detailed Application Field Plans

The L4978 is well-suited for various applications, including: - Battery-powered devices - Industrial automation systems - Automotive electronics - Telecommunication equipment - Power management modules

Detailed and Complete Alternative Models

Some alternative models to the L4978 include: - LM317: A widely used adjustable linear voltage regulator - LT1086: Offers higher output current capability - LM2940: Low dropout regulator suitable for battery-operated devices

This comprehensive entry provides an in-depth understanding of the L4978 voltage regulator, covering its specifications, features, application fields, and alternatives.

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Seznam 10 běžných otázek a odpovědí souvisejících s aplikací L4978 v technických řešeních

Sure, here are 10 common questions and answers related to the application of L4978 in technical solutions:

  1. What is the L4978?

    • The L4978 is a step-down switching regulator designed to provide high efficiency and low standby power consumption in a compact package.

  2. What is the input voltage range for the L4978?

    • The input voltage range for the L4978 is typically from 4.5V to 55V.

  3. What is the output current capability of the L4978?

    • The L4978 can deliver up to 3A of continuous output current.

  4. What is the switching frequency of the L4978?

    • The switching frequency of the L4978 is typically set at 300 kHz.

  5. What are the key features of the L4978?

    • The key features of the L4978 include high efficiency, wide input voltage range, adjustable output voltage, overcurrent and thermal protection, and low standby power consumption.

  6. How do I set the output voltage of the L4978?

    • The output voltage of the L4978 can be adjusted using an external resistor divider connected to the feedback pin.

  7. What are the typical applications of the L4978?

    • The L4978 is commonly used in industrial automation, automotive, and telecommunications applications where high efficiency and low standby power consumption are required.

  8. What is the efficiency of the L4978?

    • The efficiency of the L4978 can reach up to 95% depending on the input and output conditions.

  9. Does the L4978 have built-in protection features?

    • Yes, the L4978 includes overcurrent and thermal protection to ensure safe operation under fault conditions.

  10. Is there a reference design available for the L4978?

    • Yes, STMicroelectronics provides reference designs and application notes to help engineers implement the L4978 in their technical solutions effectively.