Overview
The TL431BQLP, produced by Texas Instruments, is a three-pin adjustable shunt regulator known for its thermal stability across a wide temperature range. This device is particularly suited for automotive, commercial, and military applications due to its robust operating characteristics. The TL431BQLP allows for adjustable output voltage settings between approximately 2.5 V and 36 V using two external resistors, making it an excellent replacement for Zener diodes in various power supply and voltage regulation applications.
Key Specifications
| Specification | Value |
|---|---|
| Package | TO-92 (LP) |
| Pins | 3 |
| Operating Temperature Range (°C) | -40 to 125 |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) |
| Adjustable Output Voltage | Vref (approximately 2.5 V) to 36 V |
| Typical Output Impedance | 0.2 Ω |
| Sink-Current Capability | 1 mA to 100 mA |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) |
Key Features
- Adjustable output voltage from approximately 2.5 V to 36 V using two external resistors.
- Operation from -40°C to 125°C, making it suitable for automotive and other harsh environments.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability ranging from 1 mA to 100 mA.
- Active output circuitry providing a sharp turn-on characteristic, ideal for replacing Zener diodes.
- Available in three grades with different initial tolerances: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
Applications
- On-board regulation in various electronic systems.
- Adjustable power supplies and switching power supplies.
- Automotive systems requiring robust temperature stability.
- Industrial applications where precise voltage regulation is necessary.
- Replacement for Zener diodes in existing designs.
Q & A
- What is the TL431BQLP?
The TL431BQLP is a three-pin adjustable shunt regulator produced by Texas Instruments. - What is the operating temperature range of the TL431BQLP?
The operating temperature range is from -40°C to 125°C. - How is the output voltage of the TL431BQLP adjusted?
The output voltage can be adjusted to any value between approximately 2.5 V and 36 V using two external resistors. - What are the typical applications of the TL431BQLP?
Typical applications include on-board regulation, adjustable power supplies, switching power supplies, and automotive systems. - What is the sink-current capability of the TL431BQLP?
The sink-current capability ranges from 1 mA to 100 mA. - What are the different grades of the TL431BQLP based on reference voltage tolerance?
The TL431BQLP is available in three grades: 0.5% (B grade), 1% (A grade), and 2% (Standard grade). - What is the typical output impedance of the TL431BQLP?
The typical output impedance is 0.2 Ω. - Is the TL431BQLP suitable for replacing Zener diodes?
Yes, the TL431BQLP is an excellent replacement for Zener diodes due to its active output circuitry and sharp turn-on characteristic. - What is the package type of the TL431BQLP?
The TL431BQLP is packaged in a TO-92 (LP) package. - What are the benefits of using the TL431BQLP in automotive applications?
The TL431BQLP offers robust thermal stability and a wide operating temperature range, making it highly suitable for automotive applications.
