LM317LZG

Product Overview

Category

LM317LZG belongs to the category of voltage regulators.

Use

It is commonly used to regulate and control the output voltage in electronic circuits.

Characteristics

• Adjustable output voltage
• High precision
• Low dropout voltage
• Current limiting capability

Package

LM317LZG is available in a TO-92 package.

Essence

The essence of LM317LZG lies in its ability to provide a stable and regulated output voltage, making it an essential component in various electronic devices.

Packaging/Quantity

LM317LZG is typically packaged in reels or tubes, with quantities varying based on the manufacturer's specifications.

Specifications

• Input Voltage Range: 3V to 40V
• Output Voltage Range: 1.2V to 37V
• Output Current: Up to 100mA
• Dropout Voltage: 1.5V (typical)
• Line Regulation: 0.01%/V (typical)
• Load Regulation: 0.1% (typical)

Pin Configuration

LM317LZG has three pins:

1. ADJUST: This pin is used to set the desired output voltage.
2. OUTPUT: The regulated output voltage is obtained from this pin.
3. INPUT: The input voltage is supplied through this pin.

Functional Features

• Voltage regulation: LM317LZG ensures a constant output voltage regardless of variations in the input voltage or load conditions.
• Adjustable output: The output voltage can be easily adjusted using an external resistor connected to the ADJUST pin.
• Current limiting: LM317LZG incorporates current limiting protection, preventing excessive current flow and protecting the circuit components.

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile applications.
• High precision and low dropout voltage ensure accurate and efficient voltage regulation.
• Simple external resistor adjustment for output voltage control.
• Current limiting feature protects the circuit from damage.

Disadvantages

• Limited output current capability (up to 100mA).
• Higher power dissipation compared to switching regulators.
• Requires additional components for proper heat dissipation.

Working Principles

LM317LZG operates based on the principle of a linear regulator. It uses a voltage reference, an error amplifier, and a pass transistor to maintain a constant output voltage. The voltage reference compares the output voltage with a fixed internal reference, and the error amplifier adjusts the pass transistor accordingly to regulate the output voltage.

Detailed Application Field Plans

LM317LZG finds applications in various electronic devices and circuits, including:

1. Power supplies: LM317LZG is commonly used in adjustable power supply circuits to provide a stable output voltage.
2. Battery chargers: It is utilized in battery charging circuits to regulate the charging voltage and protect the batteries from overcharging.
3. Audio amplifiers: LM317LZG can be employed in audio amplifier circuits to provide a regulated power supply for improved audio quality.
4. LED drivers: It is used in LED driver circuits to maintain a constant current and prevent LED damage due to voltage fluctuations.

Detailed and Complete Alternative Models

Some alternative models to LM317LZG that offer similar functionality include:

1. LM1117: A low dropout voltage regulator with adjustable output voltage.
2. LM7805: A fixed output voltage regulator providing a stable 5V output.
3. LT1083: A high-current adjustable voltage regulator suitable for demanding applications.

These alternative models can be considered based on specific requirements and desired features.

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