Overview
The TL431BQD is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 series, known for its thermal stability across various temperature ranges, including automotive, commercial, and military applications. The device allows for adjustable output voltage 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 such as on-board regulation, adjustable power supplies, and switching power supplies.
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 to 125 | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Typical Output Impedance | 0.2 Ω | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Package Type | SOIC (D) | - |
| Number of Pins | 8 | - |
Key Features
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), 2% (Standard grade).
- Adjustable output voltage: Vref to 36V using two external resistors.
- Operation from -40°C to 125°C, ensuring stability across a wide temperature range.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability: 1 mA to 100 mA.
- Active output circuitry with a sharp turn-on characteristic, making it suitable for replacing Zener diodes in various applications.
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 TL431BQD? The TL431BQD is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BQD? 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 TL431BQD? The device operates from -40°C to 125°C.
- What are the reference voltage tolerances for the TL431BQD? The tolerances are 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the typical output impedance of the TL431BQD? The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BQD? The sink-current capability ranges from 1 mA to 100 mA.
- What are some common applications of the TL431BQD? Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverters, servo drive control modules, and notebook PC power adapter designs.
- Can the TL431BQD replace Zener diodes in some applications? Yes, the TL431BQD can replace Zener diodes due to its active output circuitry and sharp turn-on characteristic.
- What package type is the TL431BQD available in? The TL431BQD is available in an 8-pin SOIC (D) package.
- What is the operating junction temperature range of the TL431BQD? The operating junction temperature range is from -40°C to 125°C.
