Overview
The TL431QDBZTG4 is a three-terminal adjustable shunt regulator produced by Texas Instruments. This device is known for its high thermal stability and adjustable output voltage, making it suitable for a wide range of applications including automotive, commercial, and military environments. The TL431 series offers excellent performance as a replacement for Zener diodes in various power supply and regulation circuits.
Key Specifications
| Attribute | Value |
|---|---|
| Package | SOT-23 (DBZ) |
| Pins | 3 |
| Operating Temperature Range | -40°C to 125°C |
| Reference Voltage | Approximately 2.5V |
| Output Voltage Range | Vref to 36V |
| Output Impedance | Typical 0.2Ω |
| Sink Current Capability | 1mA to 100mA |
| Reference Voltage Tolerance | 2% (Standard grade), 1% (A grade), 0.5% (B grade) |
| Power Dissipation | 950mW |
| Mounting Method | Surface Mount |
Key Features
- Programmable output voltage up to 36V, set by two external resistors.
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- Typical output impedance of 0.2Ω and low output noise.
- Sink-current capability: 1mA to 100mA.
- Operation from -40°C to 125°C, ensuring stability over a wide temperature range.
- Active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- Shunt regulator.
- Precision current limiter.
- Precision constant current sink.
- Isolated feedback loop for Switch Mode Power Supply (SMPS).
- On-board regulation, adjustable power supplies, and switching power supplies.
Q & A
- What is the TL431QDBZTG4? The TL431QDBZTG4 is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the operating temperature range of the TL431QDBZTG4? The operating temperature range is -40°C to 125°C.
- What is the reference voltage of the TL431QDBZTG4? The reference voltage is approximately 2.5V.
- How is the output voltage of the TL431QDBZTG4 set? The output voltage can be set to any value between Vref and 36V using two external resistors.
- What are the typical applications of the TL431QDBZTG4? Applications include shunt regulation, precision current limiting, precision constant current sinking, and isolated feedback loops for SMPS.
- What is the sink-current capability of the TL431QDBZTG4? The sink-current capability ranges from 1mA to 100mA.
- What is the typical output impedance of the TL431QDBZTG4? The typical output impedance is 0.2Ω.
- Is the TL431QDBZTG4 suitable for automotive applications? Yes, it is qualified according to AEC-Q100 (grade 1) and recommended for use in automotive applications.
- What is the power dissipation of the TL431QDBZTG4? The power dissipation is 950mW.
- What are the different grades of reference voltage tolerance available for the TL431 series? The TL431 series is available in three grades: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
