Overview
The TL431ACDBZR is a three-terminal adjustable shunt regulator produced by Texas Instruments. This device is part of the TL431 family, known for its high precision and thermal stability across various temperature ranges. The TL431ACDBZR is specifically graded with a 1% reference voltage tolerance at 25°C, making it suitable for applications requiring high accuracy and reliability.
The device allows for adjustable output voltage settings between approximately 2.5V (Vref) and 36V using two external resistors. It features low output noise, a typical output impedance of 0.2Ω, and a sink-current capability ranging from 1mA to 100mA. These characteristics make the TL431ACDBZR an excellent choice for on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 1% | - |
| Adjustable Output Voltage Range | Vref to 36V | V |
| Operating Temperature Range | 0°C to 70°C (C grade), -40°C to 85°C (I grade), -40°C to 125°C (Q grade) | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Output Impedance | 0.2Ω (typical) | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Reference Voltage (Vref) | Approximately 2.495V to 2.520V | mV |
| Dynamic Cathode-Anode Impedance | 0.20 to 0.5 Ω (IK = 0.1 mA to 100 mA, VKA = Vref, f < 1 kHz) | Ω |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- High Precision: Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Low Output Noise: Ensures stable and quiet operation.
- Low Output Impedance: Typical output impedance of 0.2Ω.
- Wide Temperature Range: Operates from -40°C to 125°C, depending on the grade.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- Rack Server Power: Used in power supply systems for rack servers.
- Industrial AC/DC: Suitable for industrial AC/DC power supplies.
- AC Inverter & VF Drives: Applied in AC inverter and variable frequency drive systems.
- Servo Drive Control Module: Used in servo drive control modules for precise voltage regulation.
- Notebook PC Power Adapter Design: Utilized in power adapter designs for notebook PCs.
Q & A
- What is the TL431ACDBZR?
The TL431ACDBZR is a three-terminal adjustable shunt regulator produced by Texas Instruments, with a 1% reference voltage tolerance at 25°C.
- What is the adjustable output voltage range of the TL431ACDBZR?
The output voltage can be set to any value between approximately 2.5V (Vref) and 36V using two external resistors.
- What are the operating temperature ranges for the TL431ACDBZR?
The device operates from 0°C to 70°C (C grade), -40°C to 85°C (I grade), and -40°C to 125°C (Q grade).
- What is the typical output impedance of the TL431ACDBZR?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431ACDBZR?
The sink-current capability ranges from 1 mA to 100 mA.
- What are some common applications of the TL431ACDBZR?
Common applications include rack server power, industrial AC/DC power supplies, AC inverter and variable frequency drives, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431ACDBZR compare to Zener diodes?
The TL431ACDBZR has a sharp turn-on characteristic and active output circuitry, making it an excellent replacement for Zener diodes in many applications.
- What is the reference voltage (Vref) of the TL431ACDBZR?
The reference voltage (Vref) is approximately 2.495V to 2.520V.
- What is the dynamic cathode-anode impedance of the TL431ACDBZR?
The dynamic cathode-anode impedance is 0.20 to 0.5 Ω (IK = 0.1 mA to 100 mA, VKA = Vref, f < 1 kHz).
- How do I set the output voltage of the TL431ACDBZR?
The output voltage can be set using two external resistors according to the desired voltage between Vref and 36V.
- Where can I find more detailed technical information about the TL431ACDBZR?
More detailed technical information can be found in the datasheet available on the Texas Instruments website or through authorized distributors like Mouser Electronics.
