LM217D2T

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

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

Package: TO-220

Essence: The LM217D2T is a versatile voltage regulator IC that provides adjustable output voltage with high current capability. It offers thermal overload and short-circuit protection, making it suitable for various applications.

Packaging/Quantity: The LM217D2T is available in a TO-220 package. It is typically sold in reels or tubes containing multiple units.

Specifications

The LM217D2T has the following specifications:

• Input Voltage Range: 4.2V to 40V
• Output Voltage Range: 1.2V to 37V
• Output Current: Up to 1.5A
• Dropout Voltage: 2.0V (typical)
• Line Regulation: 0.01%/V (typical)
• Load Regulation: 0.3% (typical)
• Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The LM217D2T has three pins:

1. Input Pin (VIN): This pin is connected to the input voltage source.
2. Output Pin (VOUT): This pin provides the regulated output voltage.
3. Ground Pin (GND): This pin is connected to the ground reference.

Functional Features

The LM217D2T offers the following functional features:

• Adjustable Output Voltage: The output voltage can be adjusted using external resistors, allowing flexibility in different applications.
• High Current Capability: With an output current of up to 1.5A, the LM217D2T can handle demanding loads.
• Thermal Overload Protection: The IC incorporates thermal shutdown circuitry to prevent damage from excessive heat.
• Short-Circuit Protection: In the event of a short circuit, the LM217D2T limits the output current to protect itself and the connected components.

Advantages and Disadvantages

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

Disadvantages: - Dropout voltage of 2.0V may limit its use in low voltage applications - Requires external resistors for voltage adjustment

Working Principles

The LM217D2T is a linear voltage regulator that uses a series pass element to regulate the output voltage. It compares the reference voltage with a fraction of the output voltage and adjusts the pass element accordingly to maintain a stable output voltage.

When the input voltage exceeds the desired output voltage, the excess voltage is dropped across the pass element, resulting in dissipation of power as heat. The thermal overload protection ensures that the IC does not exceed its safe operating temperature.

Detailed Application Field Plans

The LM217D2T can be used in various applications, including but not limited to:

1. Power Supply Units: It can be used as a voltage regulator in power supply units to provide stable and adjustable output voltages.
2. Battery Chargers: The LM217D2T can regulate the charging voltage for batteries, ensuring safe and efficient charging.
3. Automotive Electronics: It finds application in automotive electronics, such as car audio systems and lighting controls, where regulated voltages are required.
4. Industrial Control Systems: The IC can be used in industrial control systems to regulate voltages for sensors, actuators, and other components.

Detailed and Complete Alternative Models

Some alternative models to the LM217D2T include:

1. LM317: Similar to LM217D2T, but with a different pin configuration (TO-220 package).
2. LM1117: Fixed output voltage regulator with various voltage options.
3. LT1083: High current adjustable voltage regulator with low dropout voltage.

These alternative models offer similar functionality and can be considered based on specific requirements and availability.

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