Overview
The TL431AIDR is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 device family, known for their thermal stability across various temperature ranges, including automotive, commercial, and military applications. The TL431AIDR allows for adjustable output voltage settings between approximately 2.5V (Vref) and 36V using two external resistors. This device is particularly useful for applications requiring precise voltage regulation, such as on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Package | SOIC (D) | 8 pins |
| Operating Temperature Range | -40°C to 85°C | |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | |
| Adjustable Output Voltage | Vref to 36V | Set by two external resistors |
| Typical Output Impedance | 0.2Ω | |
| Sink-Current Capability | 1mA to 100mA | |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) | |
| Low Output Noise |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- Operation from -40°C to 125°C, depending on the grade.
- Typical output impedance of 0.2Ω.
- Sink-current capability from 1mA to 100mA.
- Low output noise.
- Active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- AEC-Q100 qualified (grade 1) for automotive applications.
Applications
- On-board voltage regulation.
- Adjustable power supplies.
- Switching power supplies.
- Precision current limiter.
- Precision constant current sink.
- Isolated feedback loop for Switch Mode Power Supply (SMPS).
Q & A
- What is the TL431AIDR?
The TL431AIDR is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431AIDR?
The output voltage can be set between approximately 2.5V (Vref) and 36V using two external resistors.
- What are the reference voltage tolerances available for the TL431AIDR?
The device is available in three grades with initial tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the typical output impedance of the TL431AIDR?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431AIDR?
The device can sink current from 1mA to 100mA.
- What are the typical applications of the TL431AIDR?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, precision current limiters, and precision constant current sinks.
- Is the TL431AIDR suitable for automotive applications?
- What is the operating temperature range of the TL431AIDR?
The device operates from -40°C to 85°C, depending on the specific grade.
- Does the TL431AIDR have low output noise?
- Can the TL431AIDR replace Zener diodes in some applications?
