Overview
The TL431AQDBVRQ1 is an adjustable precision shunt regulator produced by Texas Instruments. This device is specifically designed for automotive applications and is qualified under the AEC-Q100 standard. It offers a high degree of thermal stability and precision, making it suitable for a variety of applications requiring stable voltage regulation.
The TL431AQDBVRQ1 features a three-pin configuration and can be adjusted to output voltages ranging from approximately 2.5 V to 36 V using two external resistors. It is known for its low output noise, low output impedance, and sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many scenarios.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (VREF) | 2.440 | 2.495 | 2.550 | mV |
| Reference Voltage Tolerance at 25°C | - | ±1% (A Grade), ±0.5% (B Grade) | - | % |
| Temperature Drift (VI(DEV)) | - | 14 mV | 34 mV | mV |
| Output Impedance | - | 0.2 Ω | - | Ω |
| Sink-Current Capability | 1 mA | - | 100 mA | mA |
| Ambient Operating Temperature Range | -40°C | - | 125°C | °C |
Key Features
- Qualified for automotive applications with AEC-Q100 test guidance.
- Adjustable output voltage from approximately 2.5 V to 36 V using two external resistors.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability from 1 mA to 100 mA.
- Sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Low reference current and improved system accuracy compared to non-LI versions.
Applications
- Onboard regulation and voltage monitoring.
- Adjustable power supplies and switching power supplies.
- Secondary side regulation in flyback SMPSs.
- Zener diode replacement.
- Comparator with integrated reference.
- Automotive LED lighting and other automotive electronic systems.
Q & A
- What is the TL431AQDBVRQ1 used for?
The TL431AQDBVRQ1 is used as an adjustable precision shunt regulator in various applications, including onboard regulation, adjustable power supplies, and switching power supplies.
- What is the operating temperature range of the TL431AQDBVRQ1?
The device operates over an ambient temperature range of -40°C to 125°C.
- How is the output voltage of the TL431AQDBVRQ1 adjusted?
The output voltage can be adjusted to any value from approximately 2.5 V to 36 V using two external resistors.
- What are the key advantages of the TL431AQDBVRQ1 over Zener diodes?
The TL431AQDBVRQ1 offers low output noise, low output impedance, and a sharp turn-on characteristic, making it a superior replacement for Zener diodes in many applications.
- Is the TL431AQDBVRQ1 qualified for automotive use?
Yes, the TL431AQDBVRQ1 is qualified for automotive applications and meets the AEC-Q100 standard.
- What is the typical output impedance of the TL431AQDBVRQ1?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431AQDBVRQ1?
The sink-current capability ranges from 1 mA to 100 mA.
- Are there any pin-to-pin alternatives to the TL431AQDBVRQ1?
Yes, the TL431LI-Q1 and TL432LI-Q1 are pin-to-pin alternatives that offer better stability and lower temperature drift.
- What are some common applications of the TL431AQDBVRQ1 in automotive systems?
Common applications include onboard regulation, adjustable power supplies, switching power supplies, and LED lighting systems.
- Where can I find detailed technical documentation for the TL431AQDBVRQ1?
Detailed technical documentation can be found on the Texas Instruments website, including datasheets and application notes.
