Overview
The TL431IP, produced by Texas Instruments, is a three-terminal adjustable precision shunt regulator. This device is part of the TL431 family, known for its high accuracy and thermal stability across a wide range of temperatures. The TL431IP is particularly useful in applications requiring a programmable voltage reference, as it can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors. This versatility makes it an excellent choice for various power supply and voltage regulation needs.
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°C to 85°C (TL431IP) | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Output Impedance | 0.2Ω (typical) | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Cathode Voltage | Up to 37 V | V |
| Reference Input Current | −0.05 to 10 mA | mA |
| Package | 8-DIP (0.300, 7.62mm) |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors.
- Low Output Noise: The device features low output noise, making it suitable for applications requiring high signal integrity.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- Thermal Stability: Specified thermal stability over applicable automotive, commercial, and military temperature ranges ensures good stability over the entire temperature range.
- Low Output Impedance: A typical output impedance of 0.2Ω enhances the device's performance in various power supply configurations.
Applications
- Rack Server Power: Used in power supply systems for rack servers due to its high accuracy and stability.
- Industrial AC/DC: Suitable for industrial power supplies and AC/DC converters.
- AC Inverter & VF Drives: Applied in AC inverter systems and variable frequency drives.
- Servo Drive Control Module: Used in servo drive control modules for precise voltage regulation.
- Notebook PC Power Adapter Design: Utilized in power adapter designs for notebook PCs due to its compact size and high performance.
Q & A
- What is the adjustable output voltage range of the TL431IP?
The output voltage can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors.
- What are the temperature ranges for the TL431IP?
The TL431IP operates from −40°C to 85°C.
- What is the typical output impedance of the TL431IP?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431IP?
The sink-current capability ranges from 1 mA to 100 mA.
- What are the common applications of the TL431IP?
Common applications include rack server power, industrial AC/DC, AC inverter & VF drives, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431IP compare to Zener diodes?
The TL431IP provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What is the reference voltage tolerance at 25°C for the TL431IP?
The reference voltage tolerance at 25°C is 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- What is the maximum cathode voltage for the TL431IP?
The maximum cathode voltage is up to 37 V.
- What is the package type for the TL431IP?
The TL431IP is available in an 8-DIP (0.300, 7.62mm) package.
- How does the TL431IP handle temperature drift?
The device features low temperature drift, with typical values of 6 mV (C temp) and 14 mV (I temp, Q temp).
