Overview
The TL431TDA1, produced by Texas Instruments, is a precision programmable shunt regulator. This three-terminal device is part of the TL431 and TL432 family, known for their adjustable output voltage and thermal stability across various temperature ranges. The TL431TDA1 is particularly useful in applications requiring a stable voltage reference with low output noise and high accuracy.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | - | % |
| Adjustable Output Voltage | Vref (approximately 2.5V) | - | 36V | V |
| Operating Temperature Range | -40°C | - | 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 | - | 100 mA | mA |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability from 1 mA to 100 mA.
- Operation from -40°C to 125°C with specified thermal stability.
- Low output drift versus temperature, ensuring good stability over the entire temperature range.
- Active output circuitry providing a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
Applications
- Rack server power supplies.
- 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, and switching power supplies.
Q & A
- What is the TL431TDA1?
The TL431TDA1 is a precision programmable shunt regulator produced by Texas Instruments.
- What are the key features of the TL431TDA1?
Key features include adjustable output voltage, low output noise, typical output impedance of 0.2 Ω, and sink-current capability from 1 mA to 100 mA.
- What is the operating temperature range of the TL431TDA1?
The device operates from -40°C to 125°C.
- How is the output voltage adjusted in the TL431TDA1?
The output voltage can be adjusted using two external resistors.
- What are some common applications of the TL431TDA1?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverter and VF drives, servo drive control modules, and notebook PC power adapter designs.
- What is the typical temperature drift of the TL431TDA1?
The typical temperature drift is 6 mV (C temp) and 14 mV (I temp, Q temp).
- Can the TL431TDA1 replace Zener diodes in some applications?
Yes, the TL431TDA1 can replace Zener diodes due to its active output circuitry and sharp turn-on characteristic.
- What are the different grades of the TL431TDA1 based on reference voltage tolerance?
The device is available in B grade (0.5%), A grade (1%), and Standard grade (2%) based on reference voltage tolerance at 25°C.
- How does the TL431TDA1 ensure thermal stability?
The device ensures thermal stability through its specified thermal characteristics over applicable automotive, commercial, and military temperature ranges.
- What is the significance of low output impedance in the TL431TDA1?
The low output impedance of 0.2 Ω ensures minimal voltage drop and efficient operation.
