Overview
The TL431ACDCKT is a three-terminal adjustable precision shunt regulator produced by Texas Instruments. This device is part of the TL431 series, known for its high precision and thermal stability. The TL431ACDCKT is particularly useful in applications requiring a stable voltage reference with adjustable output voltage capabilities.
It is available in the SC-70 (DCK) package and is characterized for operation over a wide temperature range, making it suitable for various industrial, automotive, and commercial applications.
Key Specifications
| Characteristic | Symbol | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | % | 0.5 (B grade), 1 (A grade), 2 (Standard grade) | - | - |
| Adjustable Output Voltage | - | V | Vref (2.5V) | - | 36 |
| Operating Temperature Range | - | °C | -40 | - | 125 |
| Typical Temperature Drift | - | mV | 6 (C temp), 14 (I temp, Q temp) | - | - |
| Output Impedance | - | Ω | - | 0.2 | - |
| Sink-Current Capability | - | mA | 1 | - | 100 |
| Thermal Resistance, Junction-to-Ambient | RJA | °C/W | - | 114 | - |
| Thermal Resistance, Junction-to-Case | RJC | °C/W | - | 41 | - |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V using two external resistors.
- High Precision: Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Wide Operating Temperature Range: Operates from −40°C to 125°C, making it suitable for various environments.
- Low Output Noise: Features low output noise, enhancing the stability of the voltage reference.
- Low Output Impedance: Typical output impedance of 0.2 Ω.
- Sink-Current Capability: Can sink current from 1 mA to 100 mA.
- Thermal Stability: Low temperature drift ensures good stability over the entire temperature range.
Applications
- Rack Server Power: Used in power supply units for rack servers due to its high precision and stability.
- Industrial AC/DC: Suitable for industrial AC/DC power supplies and converters.
- AC Inverter & VF Drives: Applied in AC inverters and variable frequency drives.
- Servo Drive Control Module: Used in servo drive control modules for precise voltage regulation.
- Notebook PC Power Adapter Design: Utilized in power adapter designs for notebook PCs.
Q & A
- What is the TL431ACDCKT?
The TL431ACDCKT is a three-terminal adjustable precision shunt regulator produced by Texas Instruments.
- What are the initial tolerances of the TL431ACDCKT at 25°C?
The device is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- What is the adjustable output voltage range of the TL431ACDCKT?
The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V.
- What is the operating temperature range of the TL431ACDCKT?
The device operates from −40°C to 125°C.
- What is the typical output impedance of the TL431ACDCKT?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431ACDCKT?
The device can sink current from 1 mA to 100 mA.
- What are some common applications of the TL431ACDCKT?
Common applications include rack server power, industrial AC/DC, AC inverter & VF drives, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431ACDCKT compare to Zener diodes?
The TL431ACDCKT has active output circuitry providing a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What package type is the TL431ACDCKT available in?
The TL431ACDCKT is available in the SC-70 (DCK) package.
- What is the thermal resistance of the TL431ACDCKT?
The thermal resistance, junction-to-ambient (RJA), is approximately 114 °C/W, and junction-to-case (RJC) is approximately 41 °C/W.
