Overview
The TL431BQDBZR is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 family, known for its precision and versatility in voltage regulation. This device allows for adjustable output voltage settings between approximately 2.5V and 36V, using two external resistors. The TL431BQDBZR is packaged in a SOT-23 (DBZ) case, making it suitable for surface mount applications. It is widely used in various electronic systems requiring stable voltage references, such as onboard regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Case/Package | SOT-23 (DBZ) | |
| Number of Pins | 3 | |
| Mount | Surface Mount | |
| Max Output Current | 100mA | |
| Min Input Voltage | 2.495V | |
| Max Input Voltage | 37V | |
| Max Output Voltage | 36V | |
| Tolerance | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | |
| Temperature Coefficient | 34ppm/°C | |
| Cathode Current | 700µA | |
| Min Operating Temperature | -40°C | |
| Max Operating Temperature | 125°C | |
| Output Impedance | 0.2Ω (typical) | |
| RoHS Compliance | Yes |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between 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 stability.
- Low Output Impedance: Typical output impedance of 0.2Ω.
- Sink-Current Capability: The device can sink current from 1mA to 100mA.
- Temperature Stability: Operates from -40°C to 125°C with low temperature drift.
- AEC-Q100 Qualified: Grade 1 qualified, suitable for automotive applications.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- Shunt Regulator: Used as a precision shunt regulator in various power supply applications.
- Precision Current Limiter: Can be used as a precision current limiter due to its adjustable current sinking capability.
- Precision Constant Current Sink: Suitable for applications requiring a constant current sink.
- Isolated Feedback Loop for SMPS: Used in isolated feedback loops for Switch Mode Power Supplies (SMPS).
- Voltage Monitoring and Zener Replacement: Can be used for voltage monitoring and as a replacement for Zener diodes in many applications.
Q & A
- What is the TL431BQDBZR used for?
The TL431BQDBZR is used as a three-terminal adjustable shunt regulator, suitable for applications such as onboard regulation, adjustable power supplies, and switching power supplies.
- What is the output voltage range of the TL431BQDBZR?
The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- What is the typical output impedance of the TL431BQDBZR?
The typical output impedance is 0.2Ω.
- What is the operating temperature range of the TL431BQDBZR?
The device operates from -40°C to 125°C.
- Is the TL431BQDBZR RoHS compliant?
Yes, the TL431BQDBZR is RoHS compliant.
- What are the tolerance grades available for the TL431BQDBZR?
The device is available in three tolerance grades: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- Can the TL431BQDBZR replace Zener diodes?
Yes, the TL431BQDBZR can replace Zener diodes in many applications due to its sharp turn-on characteristic and adjustable output voltage.
- What is the sink-current capability of the TL431BQDBZR?
The device can sink current from 1mA to 100mA.
- Is the TL431BQDBZR AEC-Q100 qualified?
Yes, the TL431BQDBZR is AEC-Q100 qualified (Grade 1), making it suitable for automotive applications.
- What are some common applications of the TL431BQDBZR?
Common applications include shunt regulation, precision current limiting, precision constant current sinking, and isolated feedback loops for SMPS.
