LM2576D2T-ADJR4G

Product Overview

Category: Voltage Regulator
Use: LM2576D2T-ADJR4G is a voltage regulator integrated circuit (IC) that provides a regulated output voltage from an unregulated input voltage. It is commonly used in various electronic devices to ensure a stable and constant power supply.
Characteristics: The LM2576D2T-ADJR4G features high efficiency, low standby current, and a wide input voltage range. It is capable of delivering up to 3A of output current with a maximum dropout voltage of 1.2V.
Package: The LM2576D2T-ADJR4G is available in a TO-263-7 package, which is a surface-mount package with seven pins.
Essence: The essence of LM2576D2T-ADJR4G lies in its ability to regulate voltage efficiently and reliably, ensuring the proper functioning of electronic devices.
Packaging/Quantity: The LM2576D2T-ADJR4G is typically sold in reels or tubes, with a quantity of 250 units per reel/tube.

Specifications

• Input Voltage Range: 4.5V to 40V
• Output Voltage Range: 1.23V to 37V
• Output Current: Up to 3A
• Dropout Voltage: 1.2V (maximum)
• Efficiency: Up to 92%
• Operating Temperature Range: -40°C to +125°C

Pin Configuration

The LM2576D2T-ADJR4G has the following pin configuration:

1. VIN (Input Voltage)
2. GND (Ground)
3. FB (Feedback)
4. VOUT (Output Voltage)
5. ON/OFF (Enable/Disable)
6. SS/TR (Soft-Start/Tracking)
7. NC (No Connection)

Functional Features

• High Efficiency: The LM2576D2T-ADJR4G offers high efficiency, minimizing power losses and maximizing energy conversion.
• Wide Input Voltage Range: It can accept a wide range of input voltages, making it suitable for various applications.
• Adjustable Output Voltage: The output voltage can be adjusted using an external resistor, providing flexibility in different scenarios.
• Protection Mechanisms: The IC incorporates protection features such as thermal shutdown, current limiting, and short-circuit protection.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power dissipation. - Wide input voltage range allows for versatile applications. - Adjustable output voltage provides flexibility. - Integrated protection mechanisms enhance reliability.

Disadvantages: - Limited maximum output current compared to some other voltage regulators. - Requires additional external components for proper operation.

Working Principles

The LM2576D2T-ADJR4G operates on the principle of pulse-width modulation (PWM). It uses a feedback mechanism to compare the actual output voltage with a reference voltage and adjusts the duty cycle of the internal switch accordingly. This regulates the output voltage within the desired range.

When the input voltage exceeds the desired output voltage, the internal switch is turned off, reducing the duty cycle and lowering the output voltage. Conversely, when the input voltage drops below the desired output voltage, the switch is turned on, increasing the duty cycle and raising the output voltage.

Detailed Application Field Plans

The LM2576D2T-ADJR4G finds applications in various fields, including:

1. Power supply units for electronic devices
2. Battery charging circuits
3. Automotive electronics
4. Industrial control systems
5. LED lighting systems
6. Telecommunications equipment
7. Audio amplifiers

Detailed and Complete Alternative Models

1. LM2596S-ADJ: Similar to LM2576D2T-ADJR4G, but with a different package (TO-263-5) and slightly different specifications.
2. LM317: Adjustable voltage regulator with higher output current capability but lower efficiency compared to LM2576D2T-ADJR4G.
3. LT1083: High-current adjustable voltage regulator with improved line regulation and load regulation.

These alternative models offer similar functionality and can be considered as substitutes for LM2576D2T-ADJR4G in specific applications.

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