Overview
The TL431BIDR is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 device family, known for their specified thermal stability over a wide range of temperature conditions, including automotive, commercial, and military environments. The TL431BIDR allows for adjustable output voltage between the reference voltage (approximately 2.5V) and 36V, set using two external resistors. This device features active output circuitry, providing 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 |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B 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 |
| 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), and 2% (Standard grade)
- Adjustable output voltage: Vref to 36V, set by 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
Applications
- On-board regulation and voltage monitoring
- Adjustable power supplies and switching power supplies
- Rack server power, industrial AC/DC, and AC inverter & VF drives
- Servo drive control modules and notebook PC power adapter designs
Q & A
- What is the TL431BIDR?
The TL431BIDR is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BIDR?
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 TL431BIDR?
The device operates from -40°C to 125°C.
- What is the typical output impedance of the TL431BIDR?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BIDR?
The sink-current capability ranges from 1 mA to 100 mA.
- Can the TL431BIDR replace Zener diodes?
Yes, the TL431BIDR can replace Zener diodes due to its active output circuitry and sharp turn-on characteristic.
- What are some common applications of the TL431BIDR?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, rack server power, and industrial AC/DC systems.
- What package types are available for the TL431BIDR?
The TL431BIDR is available in the SOIC (D) package with 8 pins.
- What is the reference voltage tolerance of the TL431BIDR?
The reference voltage tolerance at 25°C is 0.5% for the B grade.
- How does the TL431BIDR handle temperature drift?
The device has a typical temperature drift of 6 mV (C temp) and 14 mV (I temp, Q temp).
