Overview
The TL431BCPW is an adjustable precision shunt regulator produced by Texas Instruments. It is part of the TL431 series, known for its high precision and adjustable output voltage. This device is a three-terminal regulator that offers specified thermal stability over a wide range of temperatures, making it suitable for various applications including automotive, commercial, and military environments.
The TL431BCPW can be set to any output voltage between approximately 2.5V and 36V using two external resistors. It features a sharp turn-on characteristic, low output noise, and a typical output impedance of 0.2Ω, making it an excellent replacement for Zener diodes in many applications.
Key Specifications
| Characteristic | Symbol | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Reference Input Voltage (at 25°C) | 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 (approx. 2.5V) | - | 36V |
| Operating Temperature Range | TA | °C | -40°C | - | 125°C |
| Sink-Current Capability | IK | mA | 1 | - | 100 |
| Typical Output Impedance | - | Ω | - | 0.2 | - |
| Thermal Resistance, Junction-to-Ambient | RJA | °C/W | - | 178 (for certain packages) | - |
Key Features
- Adjustable Output Voltage: Can be set to any value between approximately 2.5V and 36V using two external resistors.
- High Precision: Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Low Output Noise: 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.
- Wide Operating Temperature Range: Operates from -40°C to 125°C, ensuring good stability over the entire temperature range.
- Low Output Impedance: Typical output impedance of 0.2Ω.
- Sink-Current Capability: Can sink currents from 1mA to 100mA.
Applications
- On-Board Regulation: Used for local voltage regulation on circuit boards.
- Adjustable Power Supplies: Suitable for use in adjustable power supply designs.
- Switching Power Supplies: Can be used in switching power supply applications due to its sharp turn-on characteristic.
- Automotive and Military Applications: Characterized for operation in automotive, commercial, and military temperature ranges.
Q & A
- What is the TL431BCPW?
The TL431BCPW is an adjustable precision shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BCPW?
The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- What are the different grades of the TL431BCPW based on reference voltage tolerance?
The device is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- What is the typical output impedance of the TL431BCPW?
The typical output impedance is 0.2Ω.
- What is the operating temperature range of the TL431BCPW?
The device operates from -40°C to 125°C.
- What is the sink-current capability of the TL431BCPW?
The device can sink currents from 1mA to 100mA.
- Why is the TL431BCPW a good replacement for Zener diodes?
It features a sharp turn-on characteristic and low output noise, making it an excellent replacement for Zener diodes in many applications.
- What are some common applications of the TL431BCPW?
Common applications include on-board regulation, adjustable power supplies, and switching power supplies.
- Is the TL431BCPW suitable for automotive and military applications?
Yes, it is characterized for operation in automotive, commercial, and military temperature ranges.
- What is the thermal resistance of the TL431BCPW?
The thermal resistance, junction-to-ambient, is typically 178°C/W for certain packages.
