Overview
The TL431ILPRE3 is a precision programmable reference voltage regulator produced by Texas Instruments. It is part of the TL431 and TL432 family of three-terminal adjustable shunt regulators. These devices are known for their high thermal stability and are suitable for various applications across automotive, commercial, and military temperature ranges.
The TL431ILPRE3 is a pin-to-pin alternative to the standard TL431, offering improved stability, lower temperature drift, and lower reference current for enhanced system accuracy. It operates within a temperature range of -40°C to 125°C, making it versatile for different environmental conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (Vref) | 2440 | 2495 | 2550 | mV |
| Reference Voltage Tolerance at 25°C | - | 0.5% (B Grade), 1% (A Grade) | - | % |
| Adjustable Output Voltage | Vref | - | 36 | V |
| Operating Temperature Range | -40 | - | 125 | °C |
| Typical Temperature Drift | - | 6 mV (C Temp), 14 mV (I Temp, Q Temp) | - | mV |
| Output Impedance | - | 0.2 Ω | - | Ω |
| Sink-Current Capability | 1 | - | 100 | mA |
| Reference Input Current (Iref) | - | 0.4 μA | - | μA |
Key Features
- High precision reference voltage with tolerances of 0.5% (B Grade) and 1% (A Grade) at 25°C.
- Adjustable output voltage from Vref (approximately 2.495 V) to 36 V using two external resistors.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability ranging from 1 mA to 100 mA.
- Low reference input current (Iref) and deviation over temperature for improved system accuracy.
- Active output circuitry providing a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- Adjustable voltage and current referencing.
- Secondary side regulation in flyback SMPS (Switch-Mode Power Supplies).
- Zener diode replacement.
- Voltage monitoring.
- Precision constant current sink/source.
- Comparator with integrated reference.
- Onboard regulation, adjustable power supplies, and switching power supplies.
- Rack server power, industrial AC/DC, AC inverter & VF drives, and servo drive control modules.
Q & A
- What is the TL431ILPRE3?
The TL431ILPRE3 is a precision programmable reference voltage regulator produced by Texas Instruments.
- What are the key features of the TL431ILPRE3?
It includes high precision reference voltage, adjustable output voltage, low output noise, and low reference input current.
- What is the operating temperature range of the TL431ILPRE3?
The device operates from -40°C to 125°C.
- What are the typical applications of the TL431ILPRE3?
Applications include adjustable voltage and current referencing, secondary side regulation in flyback SMPS, Zener diode replacement, and voltage monitoring.
- How is the output voltage of the TL431ILPRE3 adjusted?
The output voltage can be adjusted between Vref (approximately 2.495 V) and 36 V using two external resistors.
- What is the sink-current capability of the TL431ILPRE3?
The device can sink current from 1 mA to 100 mA.
- What are the advantages of using the TL431ILPRE3 over traditional Zener diodes?
The TL431ILPRE3 offers a sharp turn-on characteristic, low output noise, and better thermal stability compared to traditional Zener diodes.
- What are the different grades of the TL431ILPRE3 based on reference voltage tolerance?
The device is available in B Grade (0.5% tolerance) and A Grade (1% tolerance) at 25°C.
- What is the typical output impedance of the TL431ILPRE3?
The typical output impedance is 0.2 Ω.
- Can the TL431ILPRE3 be used in safety-critical applications?
It is recommended to consult the datasheet and Texas Instruments' guidelines for use in safety-critical applications.
