TL431ACDR

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

Characteristics: - Adjustable Precision Shunt Regulator - Programmable Output Voltage - Low Dynamic Output Impedance - Wide Operating Current Range - Low Temperature Drift - High Accuracy

Package: SOIC-8

Essence: The TL431ACDR is a three-terminal adjustable precision shunt regulator. It provides an accurate reference voltage that can be adjusted to the desired value using external resistors. This IC is commonly used in various applications where precise voltage regulation is required.

Packaging/Quantity: The TL431ACDR is available in a standard SOIC-8 package. It is typically sold in reels containing 2500 units.

Specifications

• Reference Voltage Range: 2.495V to 36V
• Operating Current Range: 1mA to 100mA
• Temperature Range: -40°C to +85°C
• Initial Accuracy: ±0.5%
• Temperature Stability: ±50ppm/°C

Pin Configuration

The TL431ACDR has eight pins arranged as follows:

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| | --| REF K |-- --| Vref A |-- --| Anode C |-- --| Cathode D |-- --| K REF |-- --| A Vref |-- --| C Anode |-- --| D Cathode |-- |___________| ```

Functional Features

• Adjustable Output Voltage: The TL431ACDR allows the user to set the output voltage precisely by connecting external resistors.
• Low Dynamic Output Impedance: It maintains a stable output voltage even with varying load conditions.
• Wide Operating Current Range: The IC can operate within a wide range of current values, making it suitable for various applications.
• Low Temperature Drift: The TL431ACDR exhibits minimal voltage variation with temperature changes, ensuring stable performance.
• High Accuracy: It provides a highly accurate reference voltage with an initial accuracy of ±0.5%.

Advantages and Disadvantages

Advantages: - Precise voltage regulation - Wide operating current range - Low temperature drift - High accuracy

Disadvantages: - Requires external resistors for voltage adjustment - Limited output current capability

Working Principles

The TL431ACDR operates as a shunt regulator by comparing the reference voltage (Vref) with the voltage across the cathode and anode terminals. By adjusting the resistance connected to the REF pin, the output voltage can be set to the desired value. The internal circuitry of the IC ensures that the output voltage remains stable even with varying load conditions.

Detailed Application Field Plans

The TL431ACDR finds applications in various fields, including:

1. Power Supplies: It is commonly used in power supply circuits to provide precise voltage regulation and stability.
2. Battery Charging Systems: The IC is utilized in battery charging circuits to maintain a constant charging voltage.
3. Voltage References: It serves as a reliable voltage reference source in measurement and control systems.
4. Audio Amplifiers: The TL431ACDR can be employed in audio amplifier circuits to regulate bias voltages and ensure consistent performance.

Detailed and Complete Alternative Models

Some alternative models to the TL431ACDR include:

1. LM4040: Precision Micropower Shunt Voltage Reference
2. LT1009: Precision Reference
3. MAX6126: Ultra-High-Precision Voltage Reference
4. REF02: Precision Voltage Reference

These alternative models offer similar functionality and characteristics, providing options for different design requirements.

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