Overview
The TL431QDBVRG4 is a precision adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 family, known for its high accuracy and thermal stability. This device is a three-terminal adjustable shunt regulator that can be used to set output voltages between approximately 2.5V and 36V using two external resistors. The TL431QDBVRG4 is characterized for operation from −40°C to 125°C, making it suitable for various applications including automotive, commercial, and military environments.
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 | 0.2 Ω | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Package Type | SOT-23-5 (DBV) | - |
Key Features
- High accuracy with reference voltage tolerance of 0.5%, 1%, and 2% at 25°C for B, A, and standard grades respectively.
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability from 1 mA to 100 mA.
- Active output circuitry providing a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Low temperature drift, ensuring good stability over the entire temperature range.
Applications
- Rack server power supplies.
- Industrial AC/DC power supplies.
- AC inverter and VF drives.
- Servo drive control modules.
- Notebook PC power adapter designs.
- On-board regulation and adjustable power supplies.
- Switching power supplies.
Q & A
- What is the TL431QDBVRG4 used for?
The TL431QDBVRG4 is used as a precision adjustable shunt regulator in various applications, including on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431QDBVRG4?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the temperature ranges for the TL431QDBVRG4?
The device is characterized for operation from −40°C to 125°C.
- What is the typical output impedance of the TL431QDBVRG4?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431QDBVRG4?
The sink-current capability ranges from 1 mA to 100 mA.
- Why is the TL431QDBVRG4 a good replacement for Zener diodes?
It provides a sharp turn-on characteristic and low output noise, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431QDBVRG4 based on reference voltage tolerance?
The device is available in B, A, and standard grades with initial tolerances of 0.5%, 1%, and 2% at 25°C, respectively.
- What package type is the TL431QDBVRG4 available in?
The TL431QDBVRG4 is available in the SOT-23-5 (DBV) package.
- What are some common applications of the TL431QDBVRG4?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverter and VF drives, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431QDBVRG4 ensure thermal stability?
The device has low temperature drift, ensuring good stability over the entire temperature range.
