TL431A

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TL431A

V-REF ADJUSTABLE 2.5V TO 36V 100

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Thông số kỹ thuật

Part Status Active
Reference Type Shunt
Output Type Adjustable
Voltage - Output (Min/Fixed) 2.5V
Voltage - Output (Max) 36 V
Current - Output 100 mA
Tolerance ±0.4%
Operating Temperature -40°C ~ 125°C (TA)
Mounting Type Surface Mount
Package / Case TO-236-3, SC-59, SOT-23-3
Supplier Device Package SOT-23
Current - Cathode 1 mA

Tổng quan

Description

The TL431A is a programmable voltage reference and adjustable shunt regulator widely used in electronic circuits. It features a precision reference voltage of 1.25V and can be adjusted to output voltages from 1.25V to 36V, making it versatile for various applications.
Key characteristics include low output impedance, high accuracy, and temperature stability, which are crucial for power supply design and regulation. The device operates with a wide input voltage range (up to 36V) and can handle currents from a few microamperes to 100 mA, allowing it to function in different configurations, such as linear regulators and feedback loops in power supplies.
The TL431A also includes a built-in error amplifier, making it suitable for applications requiring precise control, such as flyback converters, battery chargers, and voltage monitoring circuits. Its ease of integration and reliability have made it a popular choice among engineers designing power management solutions.

Features

The TL431A is a programmable shunt voltage reference widely used in electronic circuits for voltage regulation and reference applications. Key features include:
1. Output Voltage: Adjustable output voltage from 1.24V to 37V.
2. Accuracy: ±1% initial accuracy at 25°C.
3. Temperature Coefficient: Low temperature coefficient of 30 ppm/°C ensures stable performance over temperature variations.
4. Sink Current Capability: Can sink up to 100 mA, making it suitable for various applications.
5. High Speed: Fast response time, allowing for quick adjustments in voltage output.
6. Low Output Impedance: Provides stable output under varying load conditions.
7. Wide Operating Range: Operates from 2.5V to 36V, making it versatile for different power supply designs.
8. Applications: Commonly used in power supplies, battery chargers, and as an error amplifier in feedback loops.
These features make the TL431A a popular choice for precision voltage regulation in a variety of electronic applications.

Package

The TL431A is commonly available in several package types, including TO-92, SO-8, and TO-220. These packages facilitate its use in various applications, providing options for different form factors and thermal performance.

Pinout

The TL431A is a programmable shunt voltage reference with a pin count of 3. The functions of its pins are as follows:
1. Reference (Ref): This pin provides a reference voltage of 2.5V when connected to a resistor divider. It is used to set the output voltage based on the feedback from the output voltage.
2. Anode (A): This pin is connected to the load or the output side of the circuit. It allows current to flow when the voltage on the Ref pin exceeds the set threshold.
3. Cathode (K): This pin is used for connecting to the ground or the negative side of the power supply. It serves as the output of the device, providing a regulated voltage.
The TL431A is commonly used in power supplies and voltage regulation applications, offering precision voltage reference capabilities.

Manufacturer

The TL431A is manufactured by multiple companies, with Texas Instruments (TI) being one of the most notable producers. Texas Instruments is a semiconductor company that specializes in designing and manufacturing analog and embedded processing chips. Founded in 1930, TI is recognized for its innovations in electronics and has a broad portfolio that includes a range of products such as integrated circuits, microcontrollers, and sensors.
In addition to TI, other manufacturers like ON Semiconductor, NXP Semiconductors, and STMicroelectronics also produce versions of the TL431A. These companies operate within the electronics and semiconductor industry, focusing on providing components for various applications, including consumer electronics, automotive, and industrial sectors.

Application

The TL431A is commonly used in various applications, including:
1. Voltage Regulation: Acts as a precision voltage reference and adjustable regulator.
2. Power Supply Circuits: Used in feedback loops for switching power supplies.
3. Battery Management: Monitors and stabilizes battery voltages.
4. Signal Conditioning: Provides level shifting and signal regulation.
5. LED Drivers: Controls current in LED lighting applications.
6. Overvoltage Protection: Protects circuits by clamping voltage levels.

Equivalent

Equivalent products to the TL431A chip include the LMV431, TL431C, TL431B, MCP1401, and TLV431. These devices share similar functionalities as adjustable voltage references and shunt regulators. When substituting, ensure compatible voltage and current specifications, as well as package type. Always consult datasheets for specific applications and performance characteristics.

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