Overview
The TL431BCDBVRG4 is a precision adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 family, known for its thermal stability and adjustable output voltage. This device is particularly useful in applications requiring precise voltage regulation and is often used as a replacement for Zener diodes due to its sharp turn-on characteristic and low output noise.
The TL431BCDBVRG4 is available in the SOT-23-5 package and is AEC-Q100 qualified, making it suitable for automotive and other demanding environments. It operates over a wide temperature range and offers adjustable output voltage, low output impedance, and high sink-current capability.
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 36 V | 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 | 0.2 Ω | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Package | SOT-23-5 | |
| AEC-Q100 Qualification | Grade 1 |
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 high stability.
- Low Output Impedance: Typical output impedance of 0.2 Ω.
- High Sink-Current Capability: Can sink current from 1 mA to 100 mA.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Thermal Stability: Specified thermal stability over applicable automotive, commercial, and military temperature ranges.
- AEC-Q100 Qualified: Grade 1 qualification ensures suitability for automotive and other demanding environments.
Applications
- On-Board Regulation: Used for regulating voltage on PCBs.
- Adjustable Power Supplies: Ideal for designing adjustable power supplies.
- Switching Power Supplies: Suitable for switch mode power supply (SMPS) applications due to its high EMI ruggedness.
- Precision Current Limiter: Can be used as a precision current limiter.
- Precision Constant Current Sink: Useful in applications requiring a constant current sink.
- Isolated Feedback Loop for SMPS: Used in isolated feedback loops for switch mode power supplies.
- Rack Server Power, Industrial AC/DC, AC Inverter & VF Drives, Servo Drive Control Module, Notebook PC Power Adapter Design: Various industrial and consumer electronics applications.
Q & A
- What is the TL431BCDBVRG4 used for?
The TL431BCDBVRG4 is used as a precision adjustable shunt regulator, often replacing Zener diodes in various applications such as on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431BCDBVRG4?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the reference voltage tolerances available for the TL431BCDBVRG4?
The device is available with reference voltage tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the operating temperature range of the TL431BCDBVRG4?
The device operates from −40°C to 125°C.
- What is the typical output impedance of the TL431BCDBVRG4?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BCDBVRG4?
The device can sink current from 1 mA to 100 mA.
- Is the TL431BCDBVRG4 AEC-Q100 qualified?
- What package is the TL431BCDBVRG4 available in?
The device is available in the SOT-23-5 package.
- What are some common applications of the TL431BCDBVRG4?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, precision current limiters, and isolated feedback loops for SMPS.
- How does the TL431BCDBVRG4 compare to Zener diodes?
The TL431BCDBVRG4 offers a sharper turn-on characteristic and lower output noise compared to Zener diodes, making it a superior choice in many applications.
