Overview
The TL431BIPK is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 family, known for their specified thermal stability over a wide range of temperatures, including automotive, commercial, and military applications. The device allows for adjustable output voltage settings between the reference voltage (approximately 2.5V) and 36V using two external resistors. This makes it an excellent replacement for Zener diodes in various applications such as on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Specification | Value |
|---|---|
| Package | SOT-89 (PK), 3 pins |
| Operating Temperature Range | -40°C to 125°C |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) |
| Adjustable Output Voltage | Vref (approximately 2.5V) to 36V |
| Typical Output Impedance | 0.2Ω |
| Sink-Current Capability | 1mA to 100mA |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) |
Key Features
- Adjustable output voltage: Vref to 36V using two external resistors
- Low output noise
- Typical output impedance of 0.2Ω
- Sink-current capability: 1mA to 100mA
- Operation from -40°C to 125°C with low temperature drift
- Active output circuitry providing a sharp turn-on characteristic
- Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C
Applications
- On-board regulation
- Adjustable power supplies
- Switching power supplies
- Replacement for Zener diodes in various applications
- Automotive, commercial, and military temperature ranges
Q & A
- What is the TL431BIPK?
The TL431BIPK is a three-terminal adjustable shunt regulator produced by Texas Instruments. - What is the adjustable output voltage range of the TL431BIPK?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors. - What are the operating temperature ranges for the TL431BIPK?
The device operates from -40°C to 125°C. - What are the typical output impedance and sink-current capability of the TL431BIPK?
The typical output impedance is 0.2Ω, and the sink-current capability is from 1mA to 100mA. - What are the key applications of the TL431BIPK?
Key applications include on-board regulation, adjustable power supplies, switching power supplies, and as a replacement for Zener diodes. - What are the different grades of the TL431BIPK based on reference voltage tolerance?
The device is available in three grades with initial tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C. - How does the TL431BIPK compare to Zener diodes?
The TL431BIPK has active output circuitry providing a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications. - What is the typical temperature drift of the TL431BIPK?
The typical temperature drift is 6mV for C temp and 14mV for I and Q temps. - What package type is the TL431BIPK available in?
The TL431BIPK is available in the SOT-89 (PK) package with 3 pins. - Where can I find additional technical documentation for the TL431BIPK?
Additional technical documentation, including SPICE models and design calculators, can be found on the Texas Instruments website.
