Overview
The TL431QD is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 family, known for its specified thermal stability over a wide range of temperatures, making it suitable for automotive, commercial, and military applications. The device features active output circuitry, providing a sharp turn-on characteristic, which makes it an excellent replacement for Zener diodes in various applications.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOIC (D), 8 Pins |
| Operating Temperature Range (°C) | -40 to 125 |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) |
| Adjustable Output Voltage | Vref (approximately 2.5V) to 36V |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) |
| Typical Output Impedance | 0.2Ω |
| Sink-Current Capability | 1mA to 100mA |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- Operation from -40°C to 125°C, making it suitable for a wide range of applications.
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability ranging from 1mA to 100mA.
- Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Active output circuitry with a sharp turn-on characteristic, ideal for replacing Zener diodes.
Applications
- On-board regulation.
- Adjustable power supplies.
- Switching power supplies.
- Automotive, commercial, and military applications due to its specified thermal stability.
Q & A
- What is the TL431QD?
The TL431QD is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the operating temperature range of the TL431QD?
The TL431QD operates from -40°C to 125°C.
- How is the output voltage of the TL431QD adjusted?
The output voltage can be adjusted to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the initial tolerance grades available for the TL431QD?
The TL431QD is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- What is the typical output impedance of the TL431QD?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431QD?
The sink-current capability ranges from 1mA to 100mA.
- What are some common applications of the TL431QD?
Common applications include on-board regulation, adjustable power supplies, and switching power supplies.
- Why is the TL431QD a good replacement for Zener diodes?
The TL431QD has active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- What package types are available for the TL431QD?
The TL431QD is available in an SOIC (D) package with 8 pins.
- How does the TL431QD handle temperature drift?
The TL431QD has low output drift versus temperature, ensuring good stability over the entire temperature range.
