Overview
The TL431TDA2, produced by Texas Instruments, is a three-terminal adjustable shunt regulator. It is part of the TL431 and TL432 family, known for their precision and programmability. The TL431TDA2 offers adjustable output voltage, thermal stability, and low output noise, making it an excellent choice for various applications requiring precise voltage regulation.
This device is essentially the same as the TL431 but may have different packaging and pinouts, such as the TDA2 package. It is widely used in applications that require a stable reference voltage and can replace Zener diodes in many scenarios.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | % |
| Adjustable Output Voltage | Vref to 36V | V |
| Operating Temperature Range | −40°C to 125°C | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Output Impedance | 0.2 Ω | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Output Noise | Low |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- Thermal Stability: Operates over a wide temperature range from −40°C to 125°C with low temperature drift.
- Low Output Noise: Provides a stable and quiet output, making it suitable for noise-sensitive applications.
- Sharp Turn-On Characteristic: Active output circuitry ensures a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- High Accuracy Grades: Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
Applications
- On-Board Regulation: Used in various board-level voltage regulation applications.
- Adjustable Power Supplies: Ideal for adjustable power supply designs where precise voltage control is necessary.
- Switching Power Supplies: Suitable for use in switching power supplies due to its sharp turn-on characteristic and low output impedance.
- Rack Server Power: Used in rack server power systems for stable voltage regulation.
- Industrial AC/DC and AC Inverter & VF Drives: Applied in industrial power conversion and drive systems.
- Servo Drive Control Modules: Utilized in servo drive control modules for precise voltage regulation.
- Notebook PC Power Adapters: Used in notebook PC power adapter designs for efficient and stable power supply.
Q & A
- What is the TL431TDA2?
The TL431TDA2 is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What are the key features of the TL431TDA2?
The key features include adjustable output voltage, thermal stability, low output noise, and a sharp turn-on characteristic.
- What is the operating temperature range of the TL431TDA2?
The device operates from −40°C to 125°C.
- How is the output voltage of the TL431TDA2 adjusted?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the typical applications of the TL431TDA2?
It is used in on-board regulation, adjustable power supplies, switching power supplies, rack server power, industrial AC/DC, AC inverter & VF drives, servo drive control modules, and notebook PC power adapters.
- What are the different grades of the TL431TDA2?
The device 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 TL431TDA2?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431TDA2?
The device can sink current from 1 mA to 100 mA.
- How does the TL431TDA2 compare to Zener diodes?
The TL431TDA2 has a sharper turn-on characteristic and lower output noise, making it an excellent replacement for Zener diodes in many applications.
- Where can I find more detailed specifications and documentation for the TL431TDA2?
You can find detailed specifications and documentation on the Texas Instruments website or through distributors like Digi-Key and Mouser.
