TL431ILPRE3

Overview

Category: Integrated Circuit (IC)

Use: Voltage Reference

Characteristics: - Adjustable precision shunt regulator - Programmable output voltage - Low dynamic impedance - Wide operating current range - High accuracy and stability - Low temperature coefficient

Package: TO-92, SOT-23, SOIC-8

Essence: The TL431ILPRE3 is a versatile integrated circuit that provides a stable reference voltage for various applications.

Packaging/Quantity: Available in reels or tubes with varying quantities depending on the manufacturer.

Specifications

The TL431ILPRE3 has the following specifications:

• Reference Voltage Range: 2.495V to 36V
• Operating Current Range: 1mA to 100mA
• Temperature Range: -40°C to +85°C
• Output Voltage Tolerance: ±1%
• Dynamic Output Impedance: 0.22Ω typical
• Cathode Current: 1mA to 100mA

Pin Configuration

The TL431ILPRE3 has three pins:

1. Anode (A): Connected to the positive supply voltage.
2. Cathode (K): Connected to the load or ground.
3. Reference (R): Provides the stable reference voltage.

Functional Features

The TL431ILPRE3 offers the following functional features:

• Adjustable Output Voltage: The reference voltage can be programmed using external resistors.
• Precision Regulation: Provides accurate and stable output voltage over a wide range of operating conditions.
• Low Dynamic Impedance: Ensures good load regulation and stability.
• Temperature Compensation: The TL431ILPRE3 has a low temperature coefficient, making it suitable for temperature-sensitive applications.
• Short-Circuit Protection: The device can withstand short-circuit conditions without damage.

Advantages and Disadvantages

Advantages: - Versatile and widely used in various applications. - Easy to use and configure. - High accuracy and stability. - Low temperature coefficient ensures reliable performance over a wide temperature range.

Disadvantages: - Requires external resistors for voltage programming. - Limited output current capability compared to other voltage regulators.

Working Principles

The TL431ILPRE3 operates as a shunt regulator. It compares the reference voltage at the Reference (R) pin with the voltage across the external resistor network connected between the Anode (A) and Cathode (K) pins. By adjusting the resistance values, the output voltage can be precisely set within the specified range. The device continuously monitors the output voltage and adjusts the current flowing through the cathode to maintain the desired voltage level.

Detailed Application Field Plans

The TL431ILPRE3 finds applications in various fields, including:

1. Power Supplies: Used as a voltage reference in linear and switching power supplies.
2. Battery Charging Systems: Provides accurate voltage regulation for battery charging circuits.
3. Audio Amplifiers: Used for biasing and voltage stabilization in audio amplifier circuits.
4. LED Drivers: Ensures constant current or voltage supply for LED lighting applications.
5. Industrial Control Systems: Provides stable voltage references for control systems and sensors.

Detailed and Complete Alternative Models

Some alternative models to TL431ILPRE3 include:

1. LM431: Similar adjustable precision shunt regulator with comparable specifications.
2. TLV431: Programmable precision shunt regulator with enhanced features.
3. LT1634: Precision voltage reference with low temperature drift and high accuracy.

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

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