Overview
The TL431BCDBVRE4 is a three-terminal adjustable 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 characterized by its thermal stability over a wide range of temperatures, making it suitable for various applications including automotive, commercial, and military environments.
The TL431BCDBVRE4 offers adjustable output voltage from approximately 2.5V to 36V, set using two external resistors. It features low output noise, a typical output impedance of 0.2Ω, and a sink-current capability ranging from 1mA to 100mA. The device is available in different packages, including the SOT-23-5 package for the TL431BCDBVRE4 model.
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 | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Output Impedance | 0.2Ω (Typical) | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Package Type | SOT-23-5 |
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.
- Low Output Noise: The device features low output noise, making it suitable for applications requiring stable voltage regulation.
- Low Output Impedance: A typical output impedance of 0.2Ω ensures minimal voltage drop and efficient current handling.
- Wide Operating Temperature Range: The device operates from −40°C to 125°C, making it suitable for a variety of environmental conditions.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
Applications
- On-Board Regulation: Suitable for regulating voltages within electronic boards and systems.
- Adjustable Power Supplies: Used in power supplies where the output voltage needs to be adjustable.
- Switching Power Supplies: Ideal for use in switching power supplies due to its low output impedance and sharp turn-on characteristic.
- Rack Server Power: Utilized in rack server power systems for stable voltage regulation.
- Industrial AC/DC and AC Inverter & VF Drives: Applied in industrial power conversion and drive systems.
- Servo Drive Control Module: Used in servo drive control modules for precise voltage regulation.
- Notebook PC Power Adapter Design: Suitable for use in power adapters for notebook PCs.
Q & A
- What is the TL431BCDBVRE4 used for?
The TL431BCDBVRE4 is used as an adjustable shunt regulator in various applications requiring precise voltage regulation, such as on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431BCDBVRE4?
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 TL431 series based on reference voltage tolerance?
The TL431 series is available in three grades: B grade with 0.5% tolerance, A grade with 1% tolerance, and standard grade with 2% tolerance at 25°C.
- What is the typical output impedance of the TL431BCDBVRE4?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431BCDBVRE4?
The sink-current capability ranges from 1 mA to 100 mA.
- What is the operating temperature range of the TL431BCDBVRE4?
The device operates from −40°C to 125°C.
- What package type is the TL431BCDBVRE4 available in?
The TL431BCDBVRE4 is available in the SOT-23-5 package.
- How does the TL431BCDBVRE4 compare to Zener diodes?
The TL431BCDBVRE4 has a sharper turn-on characteristic and lower output noise compared to Zener diodes, making it an excellent replacement in many applications.
- What are some common applications of the TL431BCDBVRE4?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, rack server power, industrial AC/DC and AC inverter & VF drives, servo drive control modules, and notebook PC power adapter design.
- How do I set the output voltage of the TL431BCDBVRE4?
The output voltage can be set using two external resistors. The TL431CALC spreadsheet provided by Texas Instruments can help calculate the necessary resistor values.
