LM317D2T

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

Characteristics: - Adjustable output voltage - High current capability - Thermal overload protection - Short circuit protection

Package: TO-263 (D2PAK)

Essence: The LM317D2T is a three-terminal adjustable voltage regulator that can provide a regulated output voltage between 1.2V and 37V.

Packaging/Quantity: Available in reels of 2500 units.

Specifications

• Input Voltage Range: 3V to 40V
• Output Voltage Range: 1.2V to 37V
• Output Current: Up to 1.5A
• Dropout Voltage: 1.5V typical at 1A load
• Line Regulation: 0.01%/V
• Load Regulation: 0.1%
• Temperature Range: -40°C to +125°C

Pin Configuration

The LM317D2T has three pins:

1. Adjust: This pin allows the user to set the desired output voltage by connecting an external resistor network.
2. Output: The regulated output voltage is obtained from this pin.
3. Input: The input voltage is applied to this pin.

Functional Features

• Adjustable Output: The LM317D2T allows the user to adjust the output voltage according to their requirements.
• Overload Protection: It incorporates thermal overload and short circuit protection, ensuring safe operation even under fault conditions.
• High Current Capability: With a maximum output current of 1.5A, it can handle a wide range of applications.
• Low Dropout Voltage: The dropout voltage is minimal, allowing efficient regulation even when the input voltage is close to the desired output voltage.

Advantages and Disadvantages

Advantages: - Wide input voltage range - Adjustable output voltage - High current capability - Thermal and short circuit protection

Disadvantages: - Requires external resistor network for voltage adjustment - Higher dropout voltage compared to some other regulators

Working Principles

The LM317D2T is a linear voltage regulator that uses a reference voltage, feedback mechanism, and pass transistor to maintain a stable output voltage. The adjust pin is connected to an external resistor network, which sets the desired output voltage. The regulator compares the output voltage with the reference voltage and adjusts the pass transistor accordingly to maintain the desired output.

Detailed Application Field Plans

The LM317D2T finds applications in various fields, including:

1. Power Supply Design: It can be used to regulate the output voltage of power supplies, ensuring a stable and reliable power source.
2. Battery Charging: The LM317D2T can be employed in battery charging circuits to provide a controlled charging voltage.
3. Audio Amplifiers: It can be used as a voltage regulator in audio amplifier circuits to ensure consistent performance.
4. LED Lighting: The LM317D2T can regulate the voltage for LED lighting systems, preventing damage due to voltage fluctuations.

Detailed and Complete Alternative Models

Some alternative models to the LM317D2T include:

1. LM1117: A low dropout voltage regulator with similar characteristics.
2. LM7805: A fixed voltage regulator that provides a constant 5V output.
3. LT1083: A high-current adjustable voltage regulator suitable for demanding applications.

These alternatives offer different features and specifications, allowing users to choose the most suitable option for their specific requirements.

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