Overview
The TL431BCP, produced by Texas Instruments, is an adjustable precision shunt regulator. This three-terminal device is known for its thermal stability and adjustable output voltage, making it a versatile component in various electronic applications. The TL431BCP can operate over a wide temperature range and is available in different grades, each with specific initial tolerances.
The device is particularly useful in applications requiring precise voltage regulation, such as on-board regulation, adjustable power supplies, and switching power supplies. Its sharp turn-on characteristic and low output impedance make it an excellent replacement for Zener diodes in many scenarios.
Key Specifications
| Characteristic | Symbol | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Reference Input Voltage (Vref) | Vref | V | 2.44 | 2.495 | 2.55 |
| Reference Voltage Tolerance at 25°C | - | % | 0.5% (B grade) | 1% (A grade) | 2% (Standard grade) |
| Adjustable Output Voltage | - | V | Vref to 36V | - | - |
| Operating Temperature Range | - | °C | -40 to 125 | - | - |
| Typical Temperature Drift | - | mV | 6mV (C temp), 14mV (I temp, Q temp) | - | - |
| Output Impedance | - | Ω | - | 0.2 | - |
| Sink-Current Capability | - | mA | 1 | - | 100 |
| Storage Temperature Range | Tstg | °C | -65 | - | 150 |
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.
- Thermal Stability: Specified thermal stability over applicable automotive, commercial, and military temperature ranges.
- Low Output Noise: The device features low output noise, making it suitable for noise-sensitive applications.
- 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 0.2Ω.
- Wide Operating Temperature Range: Operation from -40°C to 125°C, depending on the device grade.
Applications
- On-Board Regulation: Used for local voltage regulation on circuit boards.
- Adjustable Power Supplies: Suitable for applications requiring adjustable output voltages.
- Switching Power Supplies: Used in switching power supply designs for precise voltage regulation.
- Replacement for Zener Diodes: Often used as a replacement for Zener diodes due to its sharp turn-on characteristic and low output impedance.
Q & A
- What is the TL431BCP?
The TL431BCP is an adjustable precision shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BCP?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the different grades of the TL431BCP 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.
- What is the operating temperature range of the TL431BCP?
The device operates from -40°C to 125°C, depending on the specific grade.
- What is the typical output impedance of the TL431BCP?
The typical output impedance is 0.2Ω.
- What are some common applications of the TL431BCP?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, and as a replacement for Zener diodes.
- How does the TL431BCP handle temperature drift?
The device has low output drift versus temperature, ensuring good stability over the entire temperature range.
- What is the sink-current capability of the TL431BCP?
The device can sink current from 1mA to 100mA.
- Is the TL431BCP suitable for noise-sensitive applications?
Yes, the device features low output noise, making it suitable for noise-sensitive applications.
- What is the storage temperature range of the TL431BCP?
The storage temperature range is from -65°C to 150°C.
