Overview
The TL431QDBZT, produced by Texas Instruments, is a three-terminal adjustable shunt regulator known for its thermal stability across a wide range of temperatures. This device is part of the TL431 series, which includes the TL431 and TL432 models, offering similar functionality but with different pinouts. The TL431QDBZT is particularly suited for automotive, commercial, and military applications due to its robust temperature range of -40°C to 125°C.
The device allows for adjustable output voltage settings between approximately 2.5V and 36V using two external resistors, making it versatile for various power supply and voltage regulation needs. It is an excellent replacement for Zener diodes in many applications, including on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage (Vref) | Approximately 2.5 | V |
| Adjustable Output Voltage Range | 2.5 to 36 | V |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | % |
| Typical Output Impedance | 0.2 | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Operating Temperature Range | -40 to 125 | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Package Type | SOT-23 (DBZ) |
Key Features
- Adjustable output voltage from approximately 2.5V to 36V using two external resistors.
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- Typical output impedance of 0.2 Ω.
- Sink-current capability from 1 mA to 100 mA.
- Operation from -40°C to 125°C, making it suitable for automotive and other harsh environments.
- Low output noise and low temperature drift.
- Active output circuitry providing a sharp turn-on characteristic, ideal for replacing Zener diodes.
Applications
- On-board voltage regulation.
- Adjustable power supplies.
- Switching power supplies.
- Secondary side regulation in flyback SMPSs.
- Zener diode replacement.
- Voltage monitoring.
- Comparator with integrated reference.
- Industrial and automotive power supply systems.
Q & A
- What is the adjustable output voltage range of the TL431QDBZT?
The adjustable output voltage range is from approximately 2.5V to 36V.
- What are the reference voltage tolerances available for the TL431QDBZT?
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 TL431QDBZT?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431QDBZT?
The sink-current capability ranges from 1 mA to 100 mA.
- What is the operating temperature range of the TL431QDBZT?
The operating temperature range is from -40°C to 125°C.
- What are some common applications of the TL431QDBZT?
Common applications include on-board voltage regulation, adjustable power supplies, switching power supplies, and Zener diode replacement.
- Can the TL431QDBZT be used in automotive applications?
- What is the package type of the TL431QDBZT?
The package type is SOT-23 (DBZ).
- How does the TL431QDBZT compare to Zener diodes?
The TL431QDBZT provides a sharp turn-on characteristic and better stability, making it an excellent replacement for Zener diodes in many applications.
- What are the benefits of using the TL431QDBZT over other voltage regulators?
The benefits include adjustable output voltage, low output noise, low temperature drift, and high thermal stability.
