TL431QDBVR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Reference
• Characteristics: Adjustable Precision Shunt Regulator
• Package: SOT-23-5
• Essence: Programmable Precision References
• Packaging/Quantity: Tape and Reel, 3000 pieces per reel

Specifications

• Reference Voltage Range: 2.495V to 36V
• Output Current: 100mA
• Temperature Range: -40°C to +85°C
• Line Regulation: 0.2% typical
• Load Regulation: 0.4% typical
• Reference Voltage Tolerance: ±1%
• Cathode Current: 1mA to 100mA

Detailed Pin Configuration

The TL431QDBVR has a total of five pins:

1. Anode (A): Connected to the positive terminal of the voltage source.
2. Cathode (K): Connected to the load or ground.
3. Reference (R): Provides the adjustable reference voltage.
4. Cathode Current (C): Controls the cathode current.
5. NC (No Connection): Unused pin.

Functional Features

• Adjustable Reference Voltage: The TL431QDBVR allows precise adjustment of the reference voltage within a wide range.
• High Precision: Offers a reference voltage tolerance of ±1%, ensuring accurate voltage regulation.
• Low Power Consumption: Consumes minimal power during operation, making it suitable for low-power applications.
• Wide Temperature Range: Can operate in extreme temperature conditions ranging from -40°C to +85°C.
• Short-Circuit Protection: Provides protection against short-circuits, preventing damage to the circuitry.

Advantages and Disadvantages

Advantages

• Easy to use and integrate into various electronic circuits.
• Provides stable and accurate voltage regulation.
• Low cost and widely available in the market.
• Offers excellent line and load regulation.

Disadvantages

• Requires an external resistor network for precise voltage adjustment.
• Limited output current capability (100mA).

Working Principles

The TL431QDBVR is a three-terminal adjustable shunt regulator. It operates by comparing the reference voltage at the Reference pin with the voltage across the cathode and anode pins. By adjusting the resistance connected to the Cathode Current pin, the reference voltage can be precisely set. The TL431QDBVR then regulates the output voltage by shunting excess current to the cathode.

Detailed Application Field Plans

The TL431QDBVR finds applications in various fields, including:

1. Power Supplies: Used as a voltage reference in power supply circuits to maintain stable output voltages.
2. Battery Charging: Ensures accurate voltage regulation during battery charging processes.
3. Voltage Monitoring: Monitors and controls voltage levels in electronic systems to prevent damage due to overvoltage or undervoltage conditions.
4. Audio Amplifiers: Provides precise biasing and voltage stabilization in audio amplifier circuits.
5. LED Lighting: Regulates the voltage supplied to LEDs, ensuring consistent brightness and longevity.

Detailed and Complete Alternative Models

Some alternative models to the TL431QDBVR include:

1. LM4040: Precision Micropower Shunt Voltage Reference
2. LT1236: Precision Reference
3. REF3030: Low-Noise, Very Low Drift, Precision Voltage Reference
4. MAX6126: Ultra-High-Precision, Low-Noise, Low-Iq, Series Voltage Reference
5. ADR421: Precision Micropower Low Dropout Voltage Reference

These alternatives offer similar functionality and can be used as replacements depending on specific requirements.

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