Overview
The TL431ACDR, produced by Texas Instruments, is a three-terminal adjustable shunt regulator known for its precision and thermal stability. This device is part of the TL431 family, which includes various grades and temperature ranges, making it versatile for different applications. The TL431ACDR is characterized by its ability to operate from 0°C to 70°C, making it suitable for commercial and industrial environments. It offers adjustable output voltage, low output noise, and a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many scenarios.
Key Specifications
| Parameter | Value |
|---|---|
| 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 |
| Operating Temperature Range | 0°C to 70°C |
| Typical Temperature Drift | 6 mV (C temp) |
| Output Impedance | 0.2Ω (typical) |
| Sink-Current Capability | 1 mA to 100 mA |
| Output Noise | Low |
Key Features
- Adjustable output voltage settable between Vref (approximately 2.5V) and 36V using two external resistors.
- Low output impedance of 0.2Ω (typical).
- Low output noise.
- Sink-current capability from 1 mA to 100 mA.
- Sharp turn-on characteristic, making it a good replacement for Zener diodes.
- Specified thermal stability over applicable commercial temperature ranges.
Applications
- Rack server power supplies.
- Industrial AC/DC power supplies.
- AC inverter and variable frequency (VF) drives.
- Servo drive control modules.
- Notebook PC power adapter designs.
- On-board regulation and adjustable power supplies.
- Switching power supplies.
Q & A
- What is the TL431ACDR used for?
The TL431ACDR is used as a three-terminal adjustable shunt regulator, often replacing Zener diodes in various applications such as on-board regulation, adjustable power supplies, and switching power supplies. - What is the adjustable output voltage range of the TL431ACDR?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors. - What are the temperature ranges for the TL431ACDR?
The TL431ACDR operates from 0°C to 70°C. - What is the typical output impedance of the TL431ACDR?
The typical output impedance is 0.2Ω. - What is the sink-current capability of the TL431ACDR?
The sink-current capability ranges from 1 mA to 100 mA. - How does the TL431ACDR handle temperature drift?
The device has a typical temperature drift of 6 mV for the C temperature range. - What are some common applications of the TL431ACDR?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverters, servo drive control modules, and notebook PC power adapter designs. - What grades of reference voltage tolerance are available for the TL431ACDR?
The device is available in B, A, and standard grades with initial tolerances of 0.5%, 1%, and 2% at 25°C, respectively. - Does the TL431ACDR have low output noise?
Yes, the TL431ACDR is characterized by low output noise. - How does the TL431ACDR compare to Zener diodes?
The TL431ACDR offers a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
