Overview
The TL431BQDBZR is a three-terminal adjustable shunt regulator produced by Texas Instruments. This device is part of the TL431 family, known for its specified thermal stability over a wide range of temperatures, making it suitable for automotive, commercial, and military applications. The TL431BQDBZR allows for adjustable output voltage settings between approximately 2.5V (Vref) and 36V using two external resistors. It features active output circuitry that provides a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in various applications such as on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOT-23 (DBZ) | - |
| Pins | 3 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Reference Voltage Tolerance at 25°C | 0.5% (B Grade) | % |
| Adjustable Output Voltage | Vref to 36 V | V |
| Typical Temperature Drift | 14 mV (Q Temp) | mV |
| Typical Output Impedance | 0.2 Ω | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
Key Features
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade)
- Adjustable output voltage: Vref to 36 V set by two external resistors
- Operation from -40°C to 125°C
- Typical temperature drift: 14 mV (Q Temp)
- Low output noise
- Typical output impedance: 0.2 Ω
- Sink-current capability: 1 mA to 100 mA
- AEC-Q100 qualified (grade 1) for automotive applications
- Active output circuitry with a sharp turn-on characteristic
Applications
- Rack server power
- Industrial AC/DC power supplies
- AC inverter & VF drives
- Servo drive control modules
- Notebook PC power adapter designs
- On-board regulation
- Adjustable power supplies
- Switching power supplies
Q & A
- What is the operating temperature range of the TL431BQDBZR?
The operating temperature range is from -40°C to 125°C.
- How is the output voltage of the TL431BQDBZR adjusted?
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 TL431BQDBZR?
The reference voltage tolerances are 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the typical output impedance of the TL431BQDBZR?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BQDBZR?
The sink-current capability ranges from 1 mA to 100 mA.
- Is the TL431BQDBZR qualified for automotive applications?
Yes, it is AEC-Q100 qualified (grade 1) for automotive applications.
- What are some common applications of the TL431BQDBZR?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, rack server power, and industrial AC/DC power supplies.
- What is the package type of the TL431BQDBZR?
The package type is SOT-23 (DBZ) with 3 pins.
- Does the TL431BQDBZR have low output noise?
Yes, it features low output noise.
- What is the typical temperature drift of the TL431BQDBZR?
The typical temperature drift is 14 mV (Q Temp).
