Overview
The TL431AILPME3 is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 series, known for their high precision and thermal stability. This device is designed to operate over a wide temperature range, making it suitable for various applications including automotive, commercial, and military environments. The TL431AILPME3 offers adjustable output voltage, low output impedance, and a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many power supply and regulation applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage (Vref) | 2.47 to 2.52 | mV |
| Output Voltage Range | Vref to 36 | V |
| Output Impedance | 0.2 | Ω |
| Sink-Current Capability | 1 to 100 | mA |
| Operating Temperature Range | -40 to 125 | °C |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | |
| Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
Key Features
- Adjustable output voltage from Vref (approximately 2.5 V) to 36 V using two external resistors.
- Low output impedance of 0.2 Ω.
- Sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Low output noise.
- Sink-current capability from 1 mA to 100 mA.
- Operation from -40°C to 125°C with specified thermal stability.
- Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
Applications
- On-board regulation.
- Adjustable power supplies.
- Switching power supplies.
- Secondary side regulation in flyback SMPSs.
- Voltage monitoring.
- Comparator with integrated reference.
Q & A
- What is the reference voltage range of the TL431AILPME3?
The reference voltage (Vref) of the TL431AILPME3 is approximately 2.47 to 2.52 V. - How is the output voltage of the TL431AILPME3 adjusted?
The output voltage can be adjusted to any value between Vref and 36 V using two external resistors. - What is the typical output impedance of the TL431AILPME3?
The typical output impedance is 0.2 Ω. - What is the operating temperature range of the TL431AILPME3?
The device operates from -40°C to 125°C. - What are the typical applications of the TL431AILPME3?
Typical applications include on-board regulation, adjustable power supplies, switching power supplies, and secondary side regulation in flyback SMPSs. - Can the TL431AILPME3 replace Zener diodes?
Yes, the TL431AILPME3 is an excellent replacement for Zener diodes due to its sharp turn-on characteristic and adjustable output voltage. - What are the different grades of the TL431AILPME3 based on reference voltage tolerance?
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 sink-current capability of the TL431AILPME3?
The sink-current capability ranges from 1 mA to 100 mA. - How does the TL431AILPME3 perform in terms of temperature drift?
The device has a low temperature drift, with values of 6 mV (C temp) and 14 mV (I temp, Q temp). - What is the significance of the 'LI' suffix in TL431LI-Q1?
The 'LI' suffix indicates that the device offers better stability, lower temperature drift, and lower reference current for improved system accuracy.
