Overview
The TL431AQDBVT is a three-terminal adjustable precision shunt regulator produced by Texas Instruments. This device is designed to provide a precise DC voltage output, making it suitable for various power management applications. It operates over a wide temperature range from -40°C to 125°C and can produce an output voltage adjustable between 2.495 V and 36 V using two external resistors. The TL431AQDBVT is known for its high stability, low output noise, and sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many circuits.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage | 2.495 V | V |
| Reference Voltage Tolerance at 25°C | 1% (A grade) | % |
| Output Voltage Range | 2.495 V to 36 V | V |
| Operating Temperature Range | -40°C to 125°C | °C |
| Output Current Capability | 1 mA to 100 mA | mA |
| Typical Output Impedance | 0.2 Ω | Ω |
| Maximum Cathode Voltage | 37 V | V |
| Package Type | SOT-23 (DBVT) |
Key Features
- Programmable output voltage up to 36 V using two external resistors.
- Reference voltage of 2.5 V with a tolerance of 1% at 25°C.
- 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.
- Operates over a wide temperature range from -40°C to 125°C.
Applications
- Shunt regulator.
- Precision current limiter.
- Precision constant current sink.
- Isolated feedback loop for Switch Mode Power Supply (SMPS).
- Rack server power.
- Industrial AC/DC power supplies.
- AC inverter and VF drives.
- Servo drive control modules.
- Notebook PC power adapter design.
Q & A
- What is the reference voltage of the TL431AQDBVT?
The reference voltage is approximately 2.495 V with a tolerance of 1% at 25°C. - What is the adjustable output voltage range of the TL431AQDBVT?
The output voltage can be adjusted between 2.495 V and 36 V using two external resistors. - What is the operating temperature range of the TL431AQDBVT?
The device operates from -40°C to 125°C. - What is the maximum cathode voltage for the TL431AQDBVT?
The maximum cathode voltage is 37 V. - What is the typical output impedance of the TL431AQDBVT?
The typical output impedance is 0.2 Ω. - What are some common applications of the TL431AQDBVT?
Common applications include shunt regulators, precision current limiters, precision constant current sinks, and isolated feedback loops for SMPS. - What package type is the TL431AQDBVT available in?
The TL431AQDBVT is available in the SOT-23 (DBVT) package. - What is the sink-current capability of the TL431AQDBVT?
The device can sink current from 1 mA to 100 mA. - Why is the TL431AQDBVT a good replacement for Zener diodes?
It has a sharp turn-on characteristic and low output noise, making it an excellent replacement for Zener diodes in many applications. - Where can the TL431AQDBVT be used in power supply designs?
It can be used in on-board regulation, adjustable power supplies, and switching power supplies.
