TL431CD

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Voltage reference and shunt regulator
• Characteristics: Adjustable precision voltage reference, low output impedance, high accuracy, wide operating temperature range
• Package: SOIC-8 (Small Outline Integrated Circuit)
• Essence: Programmable precision voltage reference

Packaging/Quantity

• TL431CD is typically sold in reels or tubes.
• Each reel contains 2500 pieces of TL431CD.
• Each tube contains 50 pieces of TL431CD.

Specifications

• Reference Voltage Range: 2.495V to 36V
• Output Current Range: 1mA to 100mA
• Operating Temperature Range: -40°C to +85°C
• Input Voltage Range: -0.3V to 37V
• Quiescent Current: 1.0mA (maximum)

Detailed Pin Configuration

The TL431CD IC has 8 pins arranged as follows:

```

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| | --|____|-- Vref --|____|-- Anode --|____|-- Cathode --|____|-- K --|____|-- Adj --|____|-- N/C |____| ```

• Vref: Reference voltage output
• Anode: Anode terminal for the internal reference diode
• Cathode: Cathode terminal for the internal reference diode
• K: Kelvin (temperature) sensing terminal
• Adj: Adjust pin for setting the desired reference voltage
• N/C: Not connected pin

Functional Features

• The TL431CD provides a stable and adjustable reference voltage that can be used as a precise voltage source in various applications.
• It acts as a shunt regulator, maintaining a constant voltage across its terminals by dissipating excess current.
• The device has a low output impedance, allowing it to provide a stable voltage even in the presence of varying loads.
• It offers high accuracy and good temperature stability, making it suitable for precision applications.

Advantages

• Wide operating voltage range allows for versatile use in different circuits.
• Adjustable reference voltage provides flexibility in design.
• Low output impedance ensures stable voltage regulation.
• High accuracy and temperature stability make it suitable for precision applications.
• Compact SOIC-8 package enables easy integration into circuit boards.

Disadvantages

• The TL431CD requires an external resistor network for setting the desired reference voltage, adding complexity to the circuit design.
• It is sensitive to noise and may require additional filtering components for optimal performance in noisy environments.

Working Principles

The TL431CD operates based on the principle of feedback control. By comparing the reference voltage at the Adj pin with the voltage across the external resistor network connected to the Anode and Cathode pins, the device adjusts its internal current flow to maintain a constant voltage at the Vref pin. This feedback mechanism ensures precise voltage regulation.

Detailed Application Field Plans

The TL431CD finds applications in various fields, including: 1. Power supply circuits: It can be used as a voltage reference for regulating the output voltage of power supplies. 2. Battery charging circuits: It helps maintain a constant voltage during battery charging, preventing overcharging or undercharging. 3. Audio amplifiers: It can be used as a biasing element to stabilize the operating point of audio amplifier circuits. 4. Voltage regulators: It acts as a shunt regulator to provide a stable voltage reference for linear voltage regulators. 5. Industrial control systems: It finds use in control circuits that require precise voltage references for accurate measurements and control.

Detailed and Complete Alternative Models

Some alternative models to TL431CD include: - TL431ACD - TL431BCD - TL431AIDBZR - TL431BIDBZR - TL431AIDCKR - TL431BIDCKR

These models offer similar functionality and characteristics, but may have slight differences in package type or operating temperature range.

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