TL431BCDR

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage reference and shunt regulator
• Characteristics: Adjustable precision, low voltage reference, programmable output voltage, high accuracy, low quiescent current
• Package: SOIC-8 (Small Outline Integrated Circuit)
• Essence: TL431BCDR is a three-terminal adjustable precision shunt regulator that can be used as a voltage reference or as a shunt regulator to maintain a stable voltage across a load.
• Packaging/Quantity: TL431BCDR is available in tape and reel packaging with 2500 units per reel.

Specifications

• Reference Voltage Range: 2.495V to 36V
• Output Voltage Range: Vref to 36V
• Quiescent Current: 1mA (typical)
• Operating Temperature Range: -40°C to +85°C
• Line Regulation: 0.2% (typical)
• Load Regulation: 0.4% (typical)

Pin Configuration

TL431BCDR has the following pin configuration:

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| | --|REF |-- Anode --|K |-- Cathode --|A |-- Control Terminal |____| ```

Functional Features

• Adjustable Output Voltage: The TL431BCDR allows for precise adjustment of the output voltage using an external resistor divider network.
• Programmable Output Voltage: By connecting a resistor between the control terminal and the cathode, the TL431BCDR can be programmed to provide a specific output voltage.
• High Accuracy: The TL431BCDR offers high accuracy voltage references with a typical tolerance of ±1%.
• Low Quiescent Current: With a low quiescent current of 1mA, the TL431BCDR minimizes power consumption.
• Wide Operating Temperature Range: The TL431BCDR can operate in a wide temperature range from -40°C to +85°C.

Advantages and Disadvantages

Advantages: - Adjustable output voltage allows for flexibility in various applications. - High accuracy ensures precise voltage regulation. - Low quiescent current reduces power consumption. - Wide operating temperature range enables usage in extreme environments.

Disadvantages: - Requires an external resistor divider network for voltage adjustment. - Limited output current capability.

Working Principles

The TL431BCDR operates as a shunt regulator by comparing the reference voltage at the control terminal with the voltage across the cathode and anode. It adjusts the current flowing through the cathode to maintain a stable voltage across the load. By adjusting the resistance between the control terminal and the cathode, the output voltage can be programmed to a desired value.

Detailed Application Field Plans

The TL431BCDR is widely used in various applications, including:

1. Voltage References: TL431BCDR provides a stable voltage reference for precision measurement equipment, analog-to-digital converters, and voltage regulators.
2. Switching Power Supplies: It is used as a feedback element in switching power supplies to regulate the output voltage.
3. Battery Charging Systems: TL431BCDR is employed in battery charging circuits to maintain a constant voltage during the charging process.
4. Audio Amplifiers: It is used in audio amplifiers to provide a stable bias voltage for improved audio quality.

Detailed and Complete Alternative Models

Some alternative models to TL431BCDR are:

1. TLV431BQDBZR: SOT-23 package, adjustable precision shunt regulator.
2. LM4040CIM3-5.0/NOPB: SOT-23 package, precision micropower shunt voltage reference.
3. LT1004CZ-1.2#PBF: TO-92 package, precision reference voltage source.

These alternative models offer similar functionality and can be used as substitutes for TL431BCDR in various applications.

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