Overview
The TL431CDBZR is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 family, known for its specified thermal stability over a wide range of temperatures, making it suitable for automotive, commercial, and military applications. The device allows for adjustable output voltage between approximately 2.5V and 36V, set by two external resistors. It features active output circuitry with 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 | SOT-23 (DBZ) | 3 pins |
| Operating Temperature Range | 0°C to 70°C (C grade), -40°C to 85°C (I grade), -40°C to 125°C (Q grade) | Varying grades for different temperature ranges |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | Different grades for precision |
| Adjustable Output Voltage | Vref (approximately 2.5V) to 36V | Set by two external resistors |
| Typical Output Impedance | 0.2Ω | |
| Sink-Current Capability | 1mA to 100mA | |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V, set by two external resistors.
- Three different reference voltage tolerances: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- Operation from -40°C to 125°C, depending on the grade.
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability from 1mA to 100mA.
- Active output circuitry with a sharp turn-on characteristic, making it suitable for replacing Zener diodes in many applications.
Applications
- Rack server power supplies
- Industrial AC/DC power supplies
- AC inverter and VF drives
- Servo drive control modules
- Notebook PC power adapter designs
- On-board regulation, adjustable power supplies, and switching power supplies.
Q & A
- What is the TL431CDBZR?
The TL431CDBZR is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431CDBZR?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V, using two external resistors.
- What are the different temperature grades available for the TL431CDBZR?
The device is available in C grade (0°C to 70°C), I grade (-40°C to 85°C), and Q grade (-40°C to 125°C).
- What are the reference voltage tolerances for the TL431CDBZR?
The tolerances are 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the typical output impedance of the TL431CDBZR?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431CDBZR?
The device can sink current from 1mA to 100mA.
- What are some common applications of the TL431CDBZR?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverter and VF drives, servo drive control modules, and notebook PC power adapter designs.
- Can the TL431CDBZR replace Zener diodes in some applications?
Yes, the TL431CDBZR can replace Zener diodes in many applications due to its active output circuitry and sharp turn-on characteristic.
- What is the package type of the TL431CDBZR?
The TL431CDBZR comes in a SOT-23 (DBZ) package with 3 pins.
- What is the typical temperature drift of the TL431CDBZR?
The typical temperature drift is 6mV for C grade and 14mV for I and Q grades.
