Overview
The TL431BIP is a precision adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 series, known for its high accuracy and thermal stability. This device is a three-terminal adjustable shunt regulator that can be programmed to provide an output voltage between the reference voltage (approximately 2.5V) and 36V using two external resistors. The TL431BIP is particularly noted for its low output noise, sharp turn-on characteristic, and wide operating current range, making it an excellent replacement for Zener diodes in various applications.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | |
| Adjustable Output Voltage | Vref to 36V | Set using two external resistors |
| Operating Temperature Range | −40°C to 125°C | Dependent on device grade (C, I, Q) |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | |
| Output Impedance | 0.2Ω (typical) | |
| Sink-Current Capability | 1 mA to 100 mA | |
| Dynamic Impedance | 0.22 Ω (typical) at f ≤ 1.0 kHz |
Key Features
- Programmable Output Voltage: Can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- Low Output Noise: Ensures stable voltage regulation.
- Sharp Turn-On Characteristic: Makes it an excellent replacement for Zener diodes.
- Wide Operating Current Range: From 1 mA to 100 mA.
- Thermal Stability: Specified over automotive, commercial, and military temperature ranges.
- Low Output Impedance: Typical output impedance of 0.2Ω.
Applications
- On-Board Regulation: For stable voltage references in various board designs.
- Adjustable Power Supplies: Ideal for applications requiring adjustable output voltages.
- Switching Power Supplies: Used in switching power supply designs for efficient voltage regulation.
- Digital Voltmeters: Provides stable reference voltages for measurement instruments.
- Op Amp Circuitry: Used in operational amplifier circuits for precise voltage references.
- Rack Server Power, Industrial AC/DC, AC Inverter & VF Drives, Servo Drive Control Module, Notebook PC Power Adapter Design: Various industrial and consumer electronics applications.
Q & A
- What is the TL431BIP?
The TL431BIP is a precision adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BIP?
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 different grades of the TL431?
The TL43xxC devices operate from 0°C to 70°C, the TL43xxI devices from −40°C to 85°C, and the TL43xxQ devices from −40°C to 125°C.
- What is the typical output impedance of the TL431BIP?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431BIP?
The sink-current capability ranges from 1 mA to 100 mA.
- Why is the TL431BIP preferred over Zener diodes in some applications?
It is preferred due to its low output noise, sharp turn-on characteristic, and wider operating current range.
- What are some common applications of the TL431BIP?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, digital voltmeters, and op amp circuitry.
- How does the TL431BIP ensure thermal stability?
The device is specified for thermal stability over applicable automotive, commercial, and military temperature ranges.
- What is the dynamic impedance of the TL431BIP?
The dynamic impedance is typically 0.22 Ω at frequencies up to 1.0 kHz.
- Can the TL431BIP be used as a positive or negative voltage reference?
Yes, it can be used as either a positive or negative voltage reference due to its shunt regulator operation.
