TL431IDR

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 - High Accuracy and Temperature Stability

Package: SOIC-8

Essence: The TL431IDR is a three-terminal adjustable precision shunt regulator. It provides a highly accurate reference voltage that can be programmed to any desired value between the reference voltage (Vref) and 36 volts.

Packaging/Quantity: The TL431IDR is available in a standard SOIC-8 package. It is typically sold in reels of 2500 units.

Specifications

• Reference Voltage (Vref): 2.495V - 36V
• Operating Current Range (IKA): 1mA - 100mA
• Cathode Current (IK): 1mA - 100mA
• Cathode Voltage (VK): 2.5V - 37V
• Power Dissipation (PD): 625mW
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The TL431IDR has eight pins arranged as follows:

```

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| | --| 1 |-- Anode --| 2 |-- Cathode --| 3 |-- Reference --| 4 |-- N/C --| 5 |-- N/C --| 6 |-- N/C --| 7 |-- N/C --| 8 |-- N/C |____| ```

Functional Features

• Programmable output voltage allows for flexibility in various applications.
• Low dynamic output impedance ensures stability and accuracy.
• Wide operating current range enables compatibility with different load requirements.
• High accuracy and temperature stability make it suitable for precision applications.

Advantages

• Easy to use and integrate into circuits.
• Provides a stable reference voltage over a wide range of operating conditions.
• Offers excellent line and load regulation characteristics.
• Low output noise and ripple voltage.

Disadvantages

• Requires an external resistor divider network for precise voltage setting.
• Limited power dissipation capability compared to other voltage regulators.
• Not suitable for high current applications.

Working Principles

The TL431IDR operates as a shunt regulator, maintaining a constant voltage across its reference terminals. By adjusting the resistive divider connected to the reference terminal, the output voltage can be set to the desired value. The TL431IDR compares the reference voltage with the feedback voltage and adjusts the cathode current accordingly to maintain the desired output voltage.

Detailed Application Field Plans

The TL431IDR is widely used in various applications, including:

1. Voltage regulation in power supplies and battery chargers.
2. Precision voltage references in instrumentation and measurement equipment.
3. Overvoltage protection circuits in automotive and industrial systems.
4. Current limiting circuits in LED drivers and motor control systems.
5. Error amplifiers in feedback control loops.

Detailed and Complete Alternative Models

Some alternative models that can be considered as substitutes for the TL431IDR are:

1. LM4040: Precision Micropower Shunt Voltage Reference
2. LT1009: Precision Reference
3. REF3030: Low Dropout Voltage Reference
4. MAX6126: Ultra-High-Precision Voltage Reference
5. ADR421: Precision Series Voltage Reference

These alternatives offer similar functionality and performance characteristics, providing options for different design requirements.

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