TL431CDBZR

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

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

Package: SOT-23-3

Essence: The TL431CDBZR is a three-terminal adjustable precision shunt regulator. It provides a highly accurate reference voltage that can be programmed to any desired value between the reference voltage (Vref) and 36 volts, with two external resistors. This device operates as a low temperature coefficient zener diode with a sharp breakdown characteristic.

Packaging/Quantity: The TL431CDBZR is available in tape and reel packaging, with 3000 units per reel.

Specifications

• Reference Voltage (Vref): 2.495V to 36V
• Operating Current Range (Iref): 1mA to 100mA
• Temperature Range: -40°C to +85°C
• Dynamic Impedance (Zref): 0.22Ω typical at Iref = 1mA
• Output Voltage Tolerance: ±0.5% at 25°C
• Cathode Current (Ik): 1mA to 100mA

Pin Configuration

The TL431CDBZR has three pins:

1. Anode (A): Connected to the positive supply voltage.
2. Cathode (K): Connected to the load or ground.
3. Reference (R): Connected to the external resistors for programming the output voltage.

Functional Features

• Programmable Output Voltage: The TL431CDBZR allows the user to set the output voltage precisely using two external resistors, providing flexibility in various applications.
• High Accuracy and Stability: This device offers a low output voltage tolerance of ±0.5% at 25°C, ensuring reliable and consistent performance.
• Low Temperature Coefficient: The TL431CDBZR exhibits a low temperature coefficient, minimizing variations in the output voltage over a wide temperature range.
• Fast Response Time: With its low dynamic impedance, the TL431CDBZR responds quickly to changes in load conditions, maintaining a stable output voltage.

Advantages

• Versatile Voltage Reference: The adjustable output voltage makes the TL431CDBZR suitable for a wide range of applications requiring precise voltage regulation.
• Cost-Effective Solution: By eliminating the need for a dedicated voltage reference circuit, the TL431CDBZR reduces overall system costs.
• Easy to Use: The simple two-resistor programming method allows for easy customization of the output voltage.

Disadvantages

• Limited Output Current: The TL431CDBZR is designed for low to moderate current applications and may not be suitable for high-current loads.
• External Components Required: To program the output voltage, two external resistors are necessary, adding complexity to the circuit design.

Working Principles

The TL431CDBZR operates as a shunt regulator by comparing the reference voltage (Vref) with an internal voltage divider network. By adjusting the external resistors connected to the reference pin (R), the output voltage can be precisely set. When the cathode current exceeds the reference current (Iref), the TL431CDBZR starts conducting, regulating the output voltage to maintain a constant value.

Detailed Application Field Plans

The TL431CDBZR finds applications in various fields, including:

1. Power Supplies: It is commonly used in linear power supplies to provide accurate voltage regulation and stability.
2. Battery Charging Systems: The TL431CDBZR ensures precise charging voltages for batteries, preventing overcharging or undercharging.
3. Voltage References: It serves as a stable voltage reference for analog-to-digital converters, digital-to-analog converters, and other precision measurement circuits.
4. Audio Amplifiers: The TL431CDBZR can be used to regulate bias voltages in audio amplifier circuits, ensuring optimal performance.

Detailed and Complete Alternative Models

Some alternative models to the TL431CDBZR include:

1. TLV431AIDBVR: SOT-23-5 package, adjustable precision shunt regulator with a wider temperature range (-40°C to +125°C).
2. LM4040AIM3-2.5/NOPB: SOT-23-3 package, precision micropower shunt voltage reference with fixed output voltage of 2.5V.
3. REF3030AIDBZT: SOT-23-3 package, precision voltage reference with a fixed output voltage of 3.0V.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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