Overview
The TL431BQLPRE3 is a three-terminal adjustable shunt regulator produced by Texas Instruments. This device is part of the TL431 series, known for its specified thermal stability over a wide range of temperatures, including automotive, commercial, and military environments. The TL431BQLPRE3 operates from −40°C to 125°C, ensuring good stability across the entire temperature range.
The device features an adjustable output voltage that can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors. It is characterized by its sharp turn-on characteristic, making it an excellent replacement for Zener diodes in various applications.
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 |
| Cathode Voltage | 37 V | V |
| Operating Junction Temperature Range | 150 °C | °C |
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 with two external resistors
- Operation from −40°C to 125°C, ensuring good stability over the entire temperature range
- Typical temperature drift: 6 mV (C Temp), 14 mV (I Temp, Q Temp)
- Low output noise and typical output impedance of 0.2 Ω
- Sink-current capability: 1 mA to 100 mA
- Sharp turn-on characteristic, making it an excellent replacement for Zener diodes
Applications
- On-board regulation and adjustable power supplies
- Switching power supplies
- Rack server power and industrial AC/DC power supplies
- AC inverter and VF drives
- Servo drive control modules
- Notebook PC power adapter designs
Q & A
- What is the operating temperature range of the TL431BQLPRE3?
The TL431BQLPRE3 operates from −40°C to 125°C
- What is the adjustable output voltage range of the TL431BQLPRE3?
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 TL431 series?
The reference voltage tolerances are 0.5% (B Grade), 1% (A Grade), and 2% (Standard Grade)
- What is the typical output impedance of the TL431BQLPRE3?
The typical output impedance is 0.2 Ω
- What is the sink-current capability of the TL431BQLPRE3?
The sink-current capability ranges from 1 mA to 100 mA
- What are some common applications of the TL431BQLPRE3?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, rack server power, industrial AC/DC power supplies, AC inverter and VF drives, servo drive control modules, and notebook PC power adapter designs
- How does the TL431BQLPRE3 compare to Zener diodes?
The TL431BQLPRE3 has a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications
- What is the typical temperature drift of the TL431BQLPRE3?
The typical temperature drift is 6 mV (C Temp) and 14 mV (I Temp, Q Temp)
- What is the maximum cathode voltage for the TL431BQLPRE3?
The maximum cathode voltage is 37 V
- What is the operating junction temperature range for the TL431BQLPRE3?
The operating junction temperature range is up to 150 °C
