LM317EMP

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Regulator

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

Package: TO-252 (DPAK)

Essence: The LM317EMP is a versatile voltage regulator IC that provides adjustable output voltage with high current capability. It is commonly used in various electronic circuits to regulate and stabilize the voltage.

Packaging/Quantity: The LM317EMP is available in a TO-252 package, also known as DPAK (Plastic Package). It is typically sold in reels or tubes containing multiple units.

Specifications

The LM317EMP has the following specifications:

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

Pin Configuration

The LM317EMP has three pins:

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

Functional Features

• Adjustable Output Voltage: The LM317EMP allows the user to adjust the output voltage according to their requirements.
• High Current Capability: With a maximum output current of 1.5A, it can handle a wide range of applications.
• Low Dropout Voltage: The low dropout voltage ensures efficient regulation even when the input voltage is close to the desired output voltage.
• Thermal Overload Protection: The IC incorporates thermal overload protection, preventing damage due to excessive heat.
• Short Circuit Protection: It has built-in short circuit protection, safeguarding the IC and the connected circuitry.

Advantages and Disadvantages

Advantages: - Adjustable output voltage provides flexibility in various applications. - High current capability allows it to power demanding loads. - Thermal and short circuit protection enhance reliability and safety.

Disadvantages: - The TO-252 package may require additional heat sinking for high-power applications. - The adjustable output voltage requires external resistor network configuration.

Working Principles

The LM317EMP is a linear voltage regulator that uses a series pass transistor to regulate the output voltage. It operates by comparing the reference voltage with the feedback voltage obtained from the adjust pin. By adjusting the resistance connected to the adjust pin, the output voltage can be set accordingly.

Detailed Application Field Plans

The LM317EMP finds applications in various fields, including:

1. Power Supply Circuits: It is commonly used as a voltage regulator in power supply circuits to provide stable and regulated DC voltage.
2. Battery Charging: The LM317EMP can be used to regulate the charging voltage of batteries, ensuring safe and efficient charging.
3. Audio Amplifiers: It is utilized in audio amplifier circuits to provide a stable power source for amplification stages.
4. LED Drivers: The LM317EMP can be employed as a constant current driver for LEDs, maintaining a consistent brightness level.

Detailed and Complete Alternative Models

Some alternative models to the LM317EMP are:

1. LM1117-ADJ
2. LM350T
3. LT1083CP
4. LM7805

These alternatives offer similar functionality and can be used as substitutes depending on specific requirements.

Word count: 452