Texas Instruments TL431/TL432 Precision Programmable References
Texas Instruments TL431/TL432 Precision Programmable References are three-terminal, adjustable shunt regulators featuring specified thermal stability over functional automotive, commercial, and military temperature ranges. The output voltage can be selected to any value between Vref (about 2.5V) and 36V, utilizing two external resistors.
The TI TL431/TL432 offers a typical output impedance of 0.2Ω. Active output circuitry supplies a very sharp turnon feature, making the devices ideal replacements for Zener diodes in many applications, such as on-board regulation, adjustable power supplies, and switching power supplies. The TL432 has the same functionality and electrical specifications as the TL431 device but has different pinouts for the DBV, DBZ, and PK packages. Both the TL431 and TL432 are available in three grades, with initial tolerances (at 25°C) of 0.5%, 1%, and 2% for the B, A, and standard grades, respectively. Additionally, low output drift versus temperature verifies good stability over the entire temperature range.
The TL43xxC devices operate from 0°C to 70°C, while the TL43xxI have an operating temperature from -40°C to 85°C. The TL43xxQ are characterized for operation from -40°C to 125°C.
Features
- Reference voltage tolerance at 25°C
- 0.5% (B grade)
- 1% (A grade)
- 2% (Standard grade)
- 0.2Ω typical output impedance
- Vref to 36V adjustable output voltage
- Operation from -40°C to 125°C
- Typical temperature drift (TL43xB)
- 6mV (C temp)
- 14mV (I temp, Q temp)
- Low output noise
- 1mA to 100mA sink-current capability
Applications
- Rack server power
- Industrial AC/DC
- AC inverter and VF drives
- Servo drive control module
- Notebook PC power adapter design
Simplified Schematic
Pinout/Package Style
