Overview
The TL431AQDBZR is a three-terminal adjustable precision shunt regulator produced by Texas Instruments. This device is part of the TL431 family, known for its thermal stability over a wide range of temperatures, making it suitable for automotive, commercial, and military applications. The TL431AQDBZR allows for adjustable output voltage between the reference voltage (approximately 2.5V) and 36V, set using two external resistors. It features a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in various applications such as on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Package | SOT23 | |
| Pins | 3 | |
| Operating Temperature Range | -40°C to 125°C | |
| Reference Voltage Tolerance at 25°C | 1% (A grade) | |
| Adjustable Output Voltage | Vref (approximately 2.5V) to 36V | Set by two external resistors |
| Typical Temperature Drift | 14mV (I temp, Q temp) | |
| Output Impedance | 0.2Ω (typical) | |
| Sink-Current Capability | 1mA to 100mA | |
| Low Output Noise | Yes |
Key Features
- Adjustable output voltage between Vref (approximately 2.5V) and 36V, set by two external resistors.
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- Operation from -40°C to 125°C.
- Typical temperature drift: 6mV (C temp), 14mV (I temp, Q temp).
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability: 1mA to 100mA.
- AEC-Q100 qualified (grade 1).
- Active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- On-board regulation.
- Adjustable power supplies.
- Switching power supplies.
- Precision current limiter.
- Precision constant current sink.
- Isolated feedback loop for Switch Mode Power Supply (SMPS).
- Automotive, industrial, power, computing, consumer, mobile, and wearable applications.
Q & A
- What is the TL431AQDBZR?
The TL431AQDBZR is a three-terminal adjustable precision shunt regulator produced by Texas Instruments.
- What is the operating temperature range of the TL431AQDBZR?
The operating temperature range is from -40°C to 125°C.
- How is the output voltage of the TL431AQDBZR adjusted?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the reference voltage tolerances available for the TL431AQDBZR?
The reference voltage tolerances are 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the typical output impedance of the TL431AQDBZR?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431AQDBZR?
The sink-current capability ranges from 1mA to 100mA.
- Is the TL431AQDBZR AEC-Q100 qualified?
Yes, the TL431AQDBZR is AEC-Q100 qualified (grade 1).
- What are some common applications of the TL431AQDBZR?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, precision current limiter, precision constant current sink, and isolated feedback loop for SMPS.
- What package type is the TL431AQDBZR available in?
The TL431AQDBZR is available in the SOT23 package.
- Does the TL431AQDBZR have low output noise?
Yes, the TL431AQDBZR features low output noise.
