Overview
The TL431QDR, produced by Texas Instruments, is a precision programmable reference voltage regulator. It is part of the TL431 and TL432 family of three-terminal adjustable shunt regulators. These devices are known for their thermal stability across a wide range of temperatures, making them suitable for automotive, commercial, and military applications. The TL431QDR offers adjustable output voltage, low output noise, and a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in various power supply and regulation applications.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | - | % |
| Adjustable Output Voltage | Vref (approx. 2.5V) | - | 36V | V |
| Operating Temperature Range | -40°C | - | 125°C | °C |
| Typical Temperature Drift | - | 6 mV (C temp), 14 mV (I temp, Q temp) | - | mV |
| Output Impedance | - | 0.2 Ω | - | Ω |
| Sink-Current Capability | 1 mA | - | 100 mA | mA |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using 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, ensuring stability across a wide temperature range.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability ranging from 1 mA to 100 mA.
- Sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- Rack server power supplies.
- Industrial AC/DC power supplies.
- AC inverter and variable frequency (VF) drives.
- Servo drive control modules.
- Notebook PC power adapter designs.
- On-board regulation and adjustable power supplies.
- Switching power supplies.
Q & A
- What is the TL431QDR?
The TL431QDR is a precision programmable reference voltage regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431QDR?
The output voltage can be adjusted from Vref (approximately 2.5V) to 36V using two external resistors.
- What are the temperature ranges for the TL431QDR?
The device operates from -40°C to 125°C.
- What is the typical output impedance of the TL431QDR?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431QDR?
The sink-current capability ranges from 1 mA to 100 mA.
- What are some common applications of the TL431QDR?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverters, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431QDR compare to Zener diodes?
The TL431QDR has a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431QDR based on reference voltage tolerance?
The device is available in B grade (0.5%), A grade (1%), and Standard grade (2%) based on reference voltage tolerance at 25°C.
- What is the typical temperature drift of the TL431QDR?
The typical temperature drift is 6 mV for C temperature range and 14 mV for I and Q temperature ranges.
- Is the TL431QDR suitable for automotive applications?
Yes, the TL431QDR is suitable for automotive applications due to its specified thermal stability over applicable automotive temperature ranges.
