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Tl431 package _tl431 main parameters
Tl431 is a controllable precision voltage regulator that allows users to set the output voltage anywhere between 2.5V (the internal reference voltage) and 36V using just two resistors. This makes it highly versatile for a wide range of applications, including digital voltmeters, op-amp circuits, adjustable power supplies, and switching power supplies. Its low dynamic impedance, typically around 0.2Ω, ensures stable and accurate voltage regulation, making it a popular choice over traditional Zener diodes in many designs.
The Tl431 is manufactured by Texas Instruments and is known as a three-terminal adjustable shunt reference source with excellent thermal stability. It can be used in various electronic systems where precise voltage control is required. The device’s ability to adjust its output voltage continuously from 2.5V to 36V makes it ideal for both fixed and variable power supply designs.
In terms of packaging, the Tl431 is available in several standard forms, such as TO-92, SOT-89, and SOT-23. These packages are similar in size and shape to common transistors like the 9013, making it easy to integrate into existing circuits. Some versions also come in dual-inline (DIP) packages, suitable for through-hole PCB designs.
Key specifications of the Tl431 include:
- **Three-terminal adjustable shunt reference**
- **Programmable output voltage: 2.5V to 36V**
- **Reference voltage accuracy: ±0.4% (typical at 25°C for TL431B)**
- **Low dynamic output impedance: 0.22Ω (typical)**
- **Temperature coefficient: 50 ppm/°C (typical)**
- **Operating temperature range: -40°C to +125°C**
- **Output current range: 1mA to 100mA**
- **Maximum input voltage: 37V**
- **Maximum operating current: 150mA**
- **Internal reference voltage: 2.5V**
The Tl431 is widely used in power management circuits due to its reliability, cost-effectiveness, and ease of use. It provides a stable reference voltage and can be configured to work with different load conditions. Additionally, it has low output noise, which is essential for sensitive analog applications. Whether you're designing a simple voltage divider or a complex power supply, the Tl431 is a reliable and flexible component that can meet a variety of design needs.