TL431BCDE4

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Reference

Characteristics: - Adjustable precision shunt regulator - Programmable output voltage - Low dynamic impedance - High stability over temperature and time - Wide operating current range - Low output noise - Fast response time

Package: BCDE4

Essence: The TL431BCDE4 is a versatile integrated circuit that serves as an adjustable precision shunt regulator. It provides a stable reference voltage for various applications.

Packaging/Quantity: The TL431BCDE4 is available in the BCDE4 package, which consists of a small outline transistor (SOT) package with four pins. It is commonly sold in reels or tubes containing multiple units.

Specifications

The TL431BCDE4 has the following specifications:

• Reference Voltage Range: 2.495V to 36V
• Operating Current Range: 1mA to 100mA
• Dynamic Output Impedance: 0.22Ω (typical)
• Temperature Coefficient: ±50ppm/°C (typical)
• Output Noise Voltage: 0.2μVrms (typical)
• Response Time: 2μs (typical)

Detailed Pin Configuration

The TL431BCDE4 features four pins arranged as follows:

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.
4. Adjust (ADJ): Adjusts the output voltage by connecting a resistor divider network.

Functional Features

The TL431BCDE4 offers the following functional features:

• Voltage Regulation: It maintains a stable output voltage regardless of input variations.
• Programmable Output: The output voltage can be adjusted using an external resistor divider network.
• Current Limiting: It protects the load by limiting the output current during fault conditions.
• Temperature Compensation: The TL431BCDE4 exhibits high stability over temperature, ensuring accurate voltage regulation.

Advantages and Disadvantages

Advantages: - Wide operating voltage range - High precision and stability - Low output noise - Fast response time - Simple circuit implementation

Disadvantages: - Requires external components for operation - Limited maximum output current capability

Working Principles

The TL431BCDE4 operates based on the principle of a shunt regulator. It compares the reference voltage at the Reference (R) pin with the divided voltage at the Adjust (ADJ) pin. By adjusting the resistance in the external resistor divider network, the output voltage can be set to the desired value. The TL431BCDE4 continuously monitors the output voltage and adjusts the current flowing through the internal transistor to maintain a stable output.

Detailed Application Field Plans

The TL431BCDE4 finds applications in various fields, including:

1. Power Supplies: It is used as a voltage reference in linear and switching power supplies to regulate the output voltage.
2. Battery Charging Systems: The TL431BCDE4 ensures precise voltage control in battery charging circuits, preventing overcharging or undercharging.
3. Audio Amplifiers: It provides stable biasing voltages for audio amplifier circuits, improving performance and reducing distortion.
4. Voltage Monitors: The TL431BCDE4 is employed in voltage monitoring circuits to trigger alarms or shutdown systems when the voltage exceeds or falls below a certain threshold.

Detailed and Complete Alternative Models

Some alternative models to the TL431BCDE4 include:

1. TLV431A: Similar adjustable precision shunt regulator with a different package and pin configuration.
2. LM4040: Precision voltage reference IC with fixed output voltage options.
3. LT1009: Precision reference IC with adjustable output voltage and low temperature coefficient.

These alternative models offer similar functionality and can be used as substitutes for the TL431BCDE4 in various applications.

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