TL431CDRE4

Overview

Category: Integrated Circuits (ICs)

Use: Voltage References

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

Package: SOIC-8

Essence: The TL431CDRE4 is a three-terminal adjustable precision shunt regulator. It provides a highly accurate reference voltage, which can be programmed to any desired value between the reference voltage (Vref) and 36 volts.

Packaging/Quantity: The TL431CDRE4 is available in tape and reel packaging, with 2500 units per reel.

Specifications

• Reference Voltage (Vref): 2.495V - 36V
• Operating Current Range (Iref): 1mA - 100mA
• Temperature Coefficient: ±50 ppm/°C
• Dynamic Output Impedance: 0.22Ω
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The TL431CDRE4 has eight pins arranged as follows:

```

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| | --| 1 |-- Anode --| 2 |-- Cathode --| 3 |-- Reference Voltage (Vref) --| 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

• Precision voltage reference
• Adjustable output voltage
• Low output impedance
• High stability over temperature and time
• Programmable reference voltage
• Wide operating current range

Advantages and Disadvantages

Advantages: - Highly accurate voltage reference - Adjustable output voltage for flexibility - Low dynamic output impedance for improved stability - Wide operating current range for various applications - High stability over time and temperature

Disadvantages: - Limited maximum output voltage (36V) - Requires external components for proper operation - Sensitivity to noise and fluctuations in input voltage

Working Principles

The TL431CDRE4 operates as a shunt regulator, maintaining a constant voltage across its terminals. It compares the reference voltage (Vref) with the feedback voltage from the load and adjusts the current flowing through the device to maintain a stable output voltage.

By programming the reference voltage using external resistors, the TL431CDRE4 can be customized to provide the desired output voltage. The device continuously monitors the output voltage and adjusts the current accordingly, ensuring precise regulation.

Detailed Application Field Plans

The TL431CDRE4 is widely used in various applications, including:

1. Power Supplies: It is commonly employed in power supply circuits to provide a stable reference voltage for voltage regulation and feedback control.

2. Battery Charging Systems: The TL431CDRE4 is utilized in battery charging circuits to maintain a constant voltage during the charging process, preventing overcharging or undercharging.

3. Voltage Monitoring: It finds application in voltage monitoring circuits, where it compares the monitored voltage with a reference voltage and triggers actions based on the comparison result.

4. Audio Amplifiers: The TL431CDRE4 is used in audio amplifier circuits to provide biasing and stabilization voltages, ensuring accurate and distortion-free audio reproduction.

5. LED Drivers: It is employed in LED driver circuits to regulate the current flowing through the LEDs, ensuring consistent brightness and preventing damage due to excessive current.

Detailed and Complete Alternative Models

Some alternative models to the TL431CDRE4 include:

1. LM4040: A precision voltage reference with similar characteristics and adjustable output voltage.

2. LT1009: A precision shunt regulator with a wide operating temperature range and low dynamic output impedance.

3. REF3030: A low-power, high-precision voltage reference with adjustable output voltage and excellent long-term stability.

4. MAX6126: An ultra-low noise, high-precision voltage reference suitable for demanding applications.

5. LM336: A precision micropower shunt voltage reference with low temperature coefficient and wide operating current range.

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

In conclusion, the TL431CDRE4 is a versatile voltage reference IC with adjustable output voltage, low dynamic output impedance, and high stability. It finds applications in power supplies, battery charging systems, voltage monitoring circuits, audio amplifiers, and LED drivers. Alternative models such as LM4040, LT1009, REF3030, MAX6126, and LM336 provide similar functionality and can be used as substitutes depending on specific needs.