Overview
The TL431QDBVT is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 series, known for their specified thermal stability across various temperature ranges, including automotive, commercial, and military applications. The device allows for adjustable output voltage settings between the reference voltage (approximately 2.5V) and 36V using two external resistors. It features active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
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 | 6mV (C temp), 14mV (I temp, Q temp) | mV |
| Output Impedance | 0.2Ω (Typical) | Ω |
| Sink-Current Capability | 1mA to 100mA | mA |
| Package Type | SOT-23 (DBV) | - |
| Number of Pins | 5 | - |
Key Features
- Adjustable output voltage: Vref to 36V using two external resistors.
- Operation from -40°C to 125°C, ensuring wide temperature range compatibility.
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability ranging from 1mA to 100mA.
- Active output circuitry with a sharp turn-on characteristic, suitable for replacing Zener diodes.
- Available in three grades with different initial tolerances: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
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 regulation and adjustable power supplies.
- Switching power supplies.
Q & A
- What is the TL431QDBVT?
The TL431QDBVT is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431QDBVT?
The output voltage can be adjusted between the reference voltage (approximately 2.5V) and 36V using two external resistors.
- What are the operating temperature ranges for the TL431QDBVT?
The device operates from -40°C to 125°C.
- What are the typical temperature drift values for the TL431QDBVT?
The typical temperature drift values are 6mV for C temperature range and 14mV for I and Q temperature ranges.
- What is the output impedance of the TL431QDBVT?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431QDBVT?
The sink-current capability ranges from 1mA to 100mA.
- In what package type is the TL431QDBVT available?
The TL431QDBVT is available in the SOT-23 (DBV) package with 5 pins.
- What are some common applications of the TL431QDBVT?
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.
- Can the TL431QDBVT replace Zener diodes in some applications?
Yes, the TL431QDBVT can replace Zener diodes due to its active output circuitry and sharp turn-on characteristic.
- What are the different grades available for the TL431QDBVT?
The device is available in three grades with initial tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
