TL431QDCKR

Product Overview

• Category: Integrated Circuit
• Use: Voltage Reference
• Characteristics: Adjustable Precision Shunt Regulator
• Package: SOT-23-3
• Essence: Programmable Precision Reference
• Packaging/Quantity: Tape and Reel, 3000 pieces per reel

Specifications

• Reference Voltage Range: 2.495V to 36V
• Output Current: 100mA
• Operating Temperature Range: -40°C to +85°C
• Line Regulation: 0.2% (Typical)
• Load Regulation: 0.4% (Typical)
• Temperature Stability: 50ppm/°C (Typical)

Detailed Pin Configuration

The TL431QDCKR has three pins:

1. Anode (A): Connected to the reference voltage input.
2. Cathode (K): Connected to the ground or negative supply.
3. Reference (R): Output pin that provides a stable reference voltage.

Functional Features

• Programmable output voltage with two external resistors.
• Low dynamic output impedance.
• High accuracy and stability over temperature and time.
• Fast response time to changes in input voltage.
• Low operating current.

Advantages and Disadvantages

Advantages

• Wide range of adjustable output voltages.
• Excellent line and load regulation.
• High accuracy and stability.
• Low cost and small package size.
• Easy to use and integrate into various applications.

Disadvantages

• Limited output current capability.
• Requires external resistors for voltage adjustment.
• Not suitable for high-power applications.

Working Principles

The TL431QDCKR is a precision shunt regulator that uses a bandgap reference to provide a stable output voltage. It compares the reference voltage at the cathode with a voltage divider formed by two external resistors connected to the anode and cathode pins. By adjusting the values of these resistors, the output voltage can be set within the specified range.

The TL431QDCKR continuously monitors the input voltage and adjusts its internal resistance to maintain a constant output voltage. It operates in a feedback control loop, ensuring that the output voltage remains stable even when the input voltage or load conditions change.

Detailed Application Field Plans

The TL431QDCKR is widely used in various applications, including:

1. Voltage Regulation: It can be used as a precision voltage reference in power supplies, battery chargers, and voltage regulators.
2. Feedback Control: It is commonly used in feedback loops of switching power supplies and DC-DC converters to regulate the output voltage.
3. Battery Management: It is employed in battery monitoring circuits to provide accurate voltage references for charging and discharging processes.
4. Audio Amplifiers: It can be utilized in audio amplifiers to set bias voltages and stabilize amplifier performance.
5. Temperature Sensors: It is used in temperature sensing circuits to generate precise reference voltages for temperature measurements.

Detailed and Complete Alternative Models

Some alternative models to TL431QDCKR are:

1. LM4040: Precision Shunt Voltage Reference
2. LT1236: Micropower Precision Shunt Voltage Reference
3. REF3030: Low Dropout Voltage Reference
4. MAX6126: Ultra-High-Precision Voltage Reference
5. ADR4550: Precision Micropower Voltage Reference

These alternatives offer similar functionality and characteristics, providing options for different design requirements.

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