Overview
The TL431BCDE4 is a precision programmable reference voltage regulator produced by Texas Instruments. It is part of the TL431 and TL432 series, which are three-terminal adjustable shunt regulators known for their thermal stability across various temperature ranges, including automotive, commercial, and military environments.
These devices are highly versatile, allowing the output voltage to be set to any value between approximately 2.5V (Vref) and 36V using two external resistors. The TL431BCDE4 is particularly suited for applications requiring precise voltage regulation and stability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | % |
| Adjustable Output Voltage | Vref to 36V | V |
| Operating Temperature Range | −40°C to 125°C (Q grade) | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Output Impedance | 0.2 Ω | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Cathode Voltage | 37 V | V |
| Continuous Cathode Current Range | −100 mA to 150 mA | mA |
| Reference Input Current | −0.05 mA to 10 mA | mA |
| Operating Junction Temperature Range | −40°C to 150°C | °C |
Key Features
- Precision programmable reference voltage with adjustable output from Vref (approximately 2.5V) to 36V using two external resistors.
- High thermal stability over a wide temperature range, including automotive, commercial, and military grades.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability ranging from 1 mA to 100 mA.
- Sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- Available in various packages, including SOIC, TO-92, SOT-23-5, and SOT-89.
Applications
- Rack server power supplies.
- Industrial AC/DC power supplies.
- AC inverter and variable frequency (VF) drives.
- Servo drive control modules.
- Notebook PC power adapter designs.
- On-board voltage regulation.
- Adjustable power supplies.
- Switching power supplies.
Q & A
- What is the TL431BCDE4?
The TL431BCDE4 is a precision programmable reference voltage regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BCDE4?
The output voltage can be set to any value between approximately 2.5V (Vref) and 36V using two external resistors.
- What are the temperature ranges for the TL431BCDE4?
The device operates from −40°C to 125°C (Q grade), with different temperature ranges for C and I grades.
- What is the typical output impedance of the TL431BCDE4?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BCDE4?
The sink-current capability ranges from 1 mA to 100 mA.
- What are some common applications of the TL431BCDE4?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverters, servo drive control modules, and notebook PC power adapter designs.
- Can the TL431BCDE4 replace Zener diodes in some applications?
Yes, the TL431BCDE4 has a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431BCDE4?
The TL431BCDE4 is available in B, A, and standard grades, with initial tolerances of 0.5%, 1%, and 2%, respectively.
- What packages is the TL431BCDE4 available in?
The device is available in various packages, including SOIC, TO-92, SOT-23-5, and SOT-89.
- How does the TL431BCDE4 ensure thermal stability?
The device ensures thermal stability through its specified thermal stability over applicable automotive, commercial, and military temperature ranges.
