L4947 - English Editing Encyclopedia Entry

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Regulator
• Characteristics: High precision, low dropout voltage, adjustable output voltage, thermal shutdown protection
• Package: TO-220, SO-8
• Essence: L4947 is a voltage regulator IC designed to provide stable and regulated output voltage for various electronic devices.
• Packaging/Quantity: Available in reels or tubes, quantity depends on manufacturer's packaging standards.

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: 1.2V to 37V
• Output Current: Up to 1A
• Dropout Voltage: 0.6V typical at 1A load
• Quiescent Current: 10mA typical
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The L4947 IC has the following pin configuration:

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| | --| Vout | --| Vin | --| GND | --| Adj | |___________| ```

Functional Features

• High Precision: The L4947 provides accurate and stable output voltage regulation, ensuring reliable performance of connected devices.
• Low Dropout Voltage: With a low dropout voltage of 0.6V at 1A load, the L4947 minimizes power dissipation and improves efficiency.
• Adjustable Output Voltage: The output voltage can be easily adjusted using an external resistor, allowing flexibility in different applications.
• Thermal Shutdown Protection: The IC incorporates a thermal shutdown feature that protects it from overheating, enhancing its reliability and safety.

Advantages and Disadvantages

Advantages: - High precision voltage regulation - Low dropout voltage for improved efficiency - Adjustable output voltage for versatility - Thermal shutdown protection for enhanced safety

Disadvantages: - Limited output current capability (up to 1A) - Requires an external resistor for output voltage adjustment

Working Principles

The L4947 is a linear voltage regulator that utilizes a feedback mechanism to maintain a stable output voltage. It compares the output voltage with a reference voltage and adjusts the internal circuitry to regulate the output within the desired range. The IC also incorporates thermal shutdown protection, which activates when the temperature exceeds a certain threshold, preventing damage to the device.

Detailed Application Field Plans

The L4947 is commonly used in various electronic devices and applications, including but not limited to: - Power supplies for microcontrollers and other digital circuits - Battery-powered devices requiring stable voltage regulation - Automotive electronics, such as infotainment systems and engine control units - Industrial automation equipment - Portable consumer electronics, such as smartphones and tablets

Detailed and Complete Alternative Models

• LM317: A popular adjustable voltage regulator with similar characteristics and pin configuration.
• LT1083: High-current, adjustable linear regulator suitable for demanding applications.
• LM1117: Low dropout voltage regulator available in various fixed output voltages.

Note: This is not an exhaustive list of alternative models, and there are many other options available in the market.

In conclusion, the L4947 is a versatile voltage regulator IC offering high precision, low dropout voltage, and adjustable output voltage. Its thermal shutdown protection ensures safe operation even under challenging conditions. With its wide range of applications and availability in different package options, the L4947 is a reliable choice for voltage regulation needs in various electronic devices.

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