Overview
The TL431AILP is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 series, known for their specified thermal stability across various temperature ranges, including automotive, commercial, and military environments. The device allows for adjustable output voltage settings between the reference voltage (approximately 2.5V) and 36V using two external resistors. It features active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | TO-92 (LP) | |
| Pins | 3 | |
| Operating Temperature Range | -40 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 | |
| Typical Output Impedance | 0.2Ω | |
| Sink-Current Capability | 1mA to 100mA | |
| Cathode to Anode Voltage | 37V | |
| Reference Input Current Range | -0.05 to 10mA | |
| Operating Junction Temperature Range | -40 to 125°C |
Key Features
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), 2% (Standard grade)
- Adjustable output voltage: Vref to 36V
- Operation from -40°C to 125°C
- Typical temperature drift: 6mV (C temp), 14mV (I temp, Q temp)
- Low output noise
- Typical output impedance: 0.2Ω
- Sink-current capability: 1mA to 100mA
Applications
- Rack server power
- Industrial AC/DC power supplies
- AC inverter and VF drives
- Servo drive control modules
- Notebook PC power adapter designs
- On-board regulation
- Adjustable power supplies
- Switching power supplies
Q & A
- What is the TL431AILP?
The TL431AILP is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What are the key applications of the TL431AILP?
The TL431AILP is used in rack server power, industrial AC/DC power supplies, AC inverter and VF drives, servo drive control modules, and notebook PC power adapter designs.
- What is the adjustable output voltage range of the TL431AILP?
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 TL431AILP?
The device operates from -40°C to 125°C.
- What is the typical output impedance of the TL431AILP?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431AILP?
The sink-current capability ranges from 1mA to 100mA.
- How does the TL431AILP compare to Zener diodes?
The TL431AILP has active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431AILP based on reference voltage tolerance?
The device is available in three grades: B (0.5% tolerance), A (1% tolerance), and Standard (2% tolerance) at 25°C.
- What is the maximum cathode to anode voltage for the TL431AILP?
The maximum cathode to anode voltage is 37V.
- What is the reference input current range for the TL431AILP?
The reference input current range is -0.05 to 10mA.
