Overview
The TL431QPKG3, produced by Texas Instruments, is a three-terminal adjustable shunt regulator known for its precision and versatility. This device is part of the TL431 family, which includes various grades and packages to suit different application requirements. The TL431QPKG3 operates over a wide temperature range from −40°C to 125°C, making it suitable for automotive, commercial, and military applications. It offers adjustable output voltage from approximately 2.5V to 36V, set using two external resistors, and features a sharp turn-on characteristic, making it an excellent replacement for 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 (Typical) | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Package Type | SOT-89 (PK) |
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.
- Wide Temperature Range: Operates from −40°C to 125°C, ensuring good stability over the entire temperature range.
- Low Output Noise: Features low output noise, making it suitable for applications requiring high signal integrity.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Low Output Impedance: Typical output impedance of 0.2 Ω.
- Sink-Current Capability: Can sink current from 1 mA to 100 mA.
Applications
- Rack Server Power: Used in power supply designs 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: Employed in AC inverter and variable frequency drive applications.
- Servo Drive Control Module: Used in servo drive control modules for precise voltage regulation.
- Notebook PC Power Adapter Design: Ideal for power adapter designs in notebook PCs due to its compact size and high performance.
Q & A
- What is the TL431QPKG3?
The TL431QPKG3 is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the operating temperature range of the TL431QPKG3?
The device operates from −40°C to 125°C.
- How is the output voltage of the TL431QPKG3 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 TL431QPKG3?
It is used in rack server power, industrial AC/DC, AC inverter & VF drives, servo drive control modules, and notebook PC power adapter designs.
- What is the sink-current capability of the TL431QPKG3?
The device can sink current from 1 mA to 100 mA.
- What is the typical output impedance of the TL431QPKG3?
The typical output impedance is 0.2 Ω.
- How does the TL431QPKG3 compare to Zener diodes?
The TL431QPKG3 has a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431QPKG3?
The device is available in three grades: B (0.5% tolerance), A (1% tolerance), and Standard (2% tolerance) at 25°C.
- What is the package type of the TL431QPKG3?
The TL431QPKG3 comes in an SOT-89 (PK) package.
- What are the benefits of using the TL431QPKG3 in power supply designs?
The device offers high precision, low output noise, and good stability over a wide temperature range, making it ideal for various power supply applications.
