TL431BCD

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: DIP-8 (Dual In-line Package 8 pins)

Essence: The TL431BCD is a versatile voltage reference IC that provides accurate and stable voltage regulation in various electronic circuits.

Packaging/Quantity: The TL431BCD is typically sold in reels or tubes, with each reel/tube containing a specific quantity of ICs. The exact packaging and quantity may vary depending on the manufacturer.

Specifications

• Reference Voltage Range: 2.495V to 36V
• Operating Current Range: 1mA to 100mA
• Temperature Range: -40°C to +85°C
• Output Voltage Tolerance: ±0.5%
• Dynamic Output Impedance: 0.22Ω (typical)
• Quiescent Current: 1.0mA (typical)
• Maximum Cathode Current: 150mA

Pin Configuration

The TL431BCD has 8 pins arranged as follows:

```

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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

• Voltage Reference: The TL431BCD provides a stable reference voltage that can be adjusted using external resistors.
• Shunt Regulation: It acts as a shunt regulator by maintaining a constant voltage drop across the cathode and anode terminals.
• Programmable Output Voltage: The output voltage can be programmed by selecting appropriate resistor values in the feedback network.
• Temperature Stability: The IC exhibits high stability over a wide temperature range, ensuring consistent performance.
• Low Dynamic Impedance: The TL431BCD has a low dynamic output impedance, allowing it to provide a stable voltage even with varying load conditions.
• Fast Response Time: It responds quickly to changes in input voltage or load conditions, making it suitable for applications requiring rapid voltage regulation.

Advantages

• Wide operating current range allows flexibility in various circuit designs.
• High stability over temperature and time ensures reliable performance.
• Adjustable output voltage enables customization for specific application requirements.
• Low output noise minimizes interference in sensitive circuits.
• Fast response time makes it suitable for dynamic voltage regulation applications.

Disadvantages

• Requires external resistors for voltage adjustment, adding complexity to the circuit design.
• Limited maximum cathode current may restrict its use in high-power applications.

Working Principles

The TL431BCD operates based on the principle of shunt regulation. It compares the reference voltage at the cathode terminal with the voltage at the anode terminal. By adjusting the current flowing through the internal resistive divider, the IC maintains a constant voltage drop between the cathode and anode. This regulated voltage is then used as a reference for other components in the circuit.

Detailed Application Field Plans

The TL431BCD finds applications in various electronic systems, including but not limited to: 1. Switching Power Supplies 2. Battery Chargers 3. Voltage Regulators 4. Audio Amplifiers 5. LED Drivers 6. Precision Instrumentation 7. Automotive Electronics

Detailed and Complete Alternative Models

Some alternative models to the TL431BCD that offer similar functionality are: 1. LM431 2. TLV431 3. KA431 4. ISL43141

These alternatives can be considered based on specific application requirements, availability, and cost considerations.

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