Overview
The TL431IDBZT is a three-terminal adjustable precision shunt regulator produced by Texas Instruments. This device is part of the TL431 family, known for its high accuracy and thermal stability. It offers a programmable output voltage range from approximately 2.495 V to 36 V, set by two external resistors. The TL431IDBZT is designed to operate over a wide temperature range, making it suitable for various applications in automotive, commercial, and military environments.
Key Specifications
| Parameter | Value |
|---|---|
| Reference Voltage (Vref) | Approximately 2.495 V |
| Adjustable Output Voltage Range | Vref to 36 V |
| Reference Voltage Tolerance (at 25°C) | 0.5% (B grade), 1% (A grade), 2% (Standard grade) |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | SOT-23 (DBZ) |
| Package Size | 2.90 mm x 1.30 mm |
| Sink-Current Capability | 1 mA to 100 mA |
| Typical Output Impedance | 0.2 Ω |
| Reference Input Current (IREF) | 0.4 μA (max) |
Key Features
- Programmable output voltage up to 36 V using two external resistors.
- High accuracy with reference voltage tolerances of 0.5%, 1%, and 2%.
- Operation from -40°C to 125°C, ensuring stability over a wide temperature range.
- Low output impedance of 0.2 Ω.
- Sink-current capability from 1 mA to 100 mA.
- Active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Low output drift versus temperature, ensuring good stability.
Applications
- Adjustable voltage and current referencing.
- Secondary side regulation in flyback SMPS (Switch-Mode Power Supplies).
- Zener diode replacement.
- Voltage monitoring.
- Precision constant current sink/source.
- Comparator with integrated reference.
- On-board regulation, adjustable power supplies, and switching power supplies.
Q & A
- What is the reference voltage of the TL431IDBZT?
The reference voltage (Vref) of the TL431IDBZT is approximately 2.495 V. - What is the adjustable output voltage range of the TL431IDBZT?
The output voltage can be adjusted from Vref (approximately 2.495 V) to 36 V using two external resistors. - What are the reference voltage tolerances available for the TL431IDBZT?
The TL431IDBZT is available with reference voltage tolerances of 0.5%, 1%, and 2% at 25°C. - What is the operating temperature range of the TL431IDBZT?
The TL431IDBZT operates from -40°C to 125°C. - What is the typical output impedance of the TL431IDBZT?
The typical output impedance is 0.2 Ω. - What is the sink-current capability of the TL431IDBZT?
The sink-current capability ranges from 1 mA to 100 mA. - Can the TL431IDBZT replace Zener diodes in some applications?
Yes, the TL431IDBZT can replace Zener diodes due to its active output circuitry and sharp turn-on characteristic. - What are some common applications of the TL431IDBZT?
Common applications include adjustable voltage and current referencing, secondary side regulation in flyback SMPS, voltage monitoring, and precision constant current sink/source. - What package type is the TL431IDBZT available in?
The TL431IDBZT is available in the SOT-23 (DBZ) package. - What is the size of the SOT-23 package for the TL431IDBZT?
The SOT-23 package size is 2.90 mm x 1.30 mm.
