TL431CDR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Reference
• Characteristics: Adjustable Precision Shunt Regulator
• Package: SOIC-8
• Essence: The TL431CDR is a three-terminal adjustable precision shunt regulator. It provides a highly accurate reference voltage, which can be adjusted to the desired value using external resistors.
• Packaging/Quantity: The TL431CDR is typically sold in reels of 2500 units.

Specifications

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

Pin Configuration

The TL431CDR has a standard SOIC-8 package with the following pin configuration:

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| | --| 1 |-- Anode --| 2 |-- Cathode --| 3 |-- Reference --| 4 |-- N/C (No Connection) --| 5 |-- N/C (No Connection) --| 6 |-- N/C (No Connection) --| 7 |-- N/C (No Connection) --| 8 |-- N/C (No Connection) |____| ```

Functional Features

• Adjustable Output Voltage: The TL431CDR allows precise adjustment of the output voltage by connecting external resistors to the reference pin.
• High Accuracy: With a reference voltage tolerance of ±1%, the TL431CDR provides reliable and precise voltage regulation.
• Low Power Consumption: The TL431CDR operates with low quiescent current, making it suitable for low-power applications.
• Short-Circuit Protection: The device includes built-in short-circuit protection, ensuring safe operation even under fault conditions.

Advantages and Disadvantages

Advantages: - Highly accurate voltage reference - Adjustable output voltage - Low power consumption - Short-circuit protection

Disadvantages: - Limited output current capacity (up to 100mA) - Requires external resistors for voltage adjustment

Working Principles

The TL431CDR operates as a shunt regulator, maintaining a stable output voltage by comparing the reference voltage at the reference pin with an adjustable voltage divider connected to it. By adjusting the resistors in the voltage divider, the desired output voltage can be set. The TL431CDR continuously monitors the output voltage and adjusts the current flowing through the cathode to maintain the desired voltage level.

Detailed Application Field Plans

The TL431CDR finds applications in various fields, including:

1. Power Supplies: It is commonly used in linear power supplies to provide precise voltage regulation and stability.
2. Battery Charging: The TL431CDR can be employed in battery charging circuits to control the charging voltage and prevent overcharging.
3. Audio Amplifiers: It is utilized in audio amplifiers to provide biasing and voltage stabilization.
4. Voltage References: The TL431CDR can serve as a stable voltage reference in measurement and calibration equipment.
5. LED Drivers: It can be used in LED driver circuits to regulate the forward voltage and ensure consistent brightness.

Detailed and Complete Alternative Models

Some alternative models to the TL431CDR include:

1. LM431: A similar three-terminal adjustable precision shunt regulator offered by Texas Instruments.
2. LT1634: A precision voltage reference IC manufactured by Linear Technology.
3. MAX6126: An ultra-low-noise, high-precision voltage reference IC produced by Maxim Integrated.

These alternative models provide similar functionality and can be used as substitutes for the TL431CDR in various applications.

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