Overview
The TLV431ACDBZR from Texas Instruments is a low-voltage, adjustable precision shunt regulator. This device is part of the TLV431 series, known for its high accuracy and thermal stability over a wide range of temperatures. The TLV431ACDBZR operates with a reference voltage (VREF) of 1.24V and allows for adjustable output voltages from VREF to 6V using two external resistors. This makes it highly versatile for various voltage regulation applications.
Key Specifications
| Parameter | Value |
|---|---|
| Reference Voltage (VREF) | 1.24V |
| Output Voltage Range | VREF to 6V |
| Reference Voltage Tolerance at 25°C | ±1% for TLV431A |
| Typical Temperature Drift | 4mV (0°C to 70°C), 6mV (–40°C to 85°C), 11mV (–40°C to 125°C) |
| Operational Cathode Current | 80µA typical |
| Output Impedance | 0.25Ω typical |
| Package Type | SOT-23-3 (DBZ) |
| Operating Temperature Range | –40°C to 125°C (TLV431Q), –40°C to 85°C (TLV431I), 0°C to 70°C (TLV431C) |
Key Features
- Low-voltage operation with a reference voltage of 1.24V.
- Adjustable output voltage from VREF to 6V using two external resistors.
- High accuracy with ±1% reference voltage tolerance at 25°C for the TLV431A model.
- Low operational cathode current of 80µA typical.
- Ultra-small SC-70 package available, offering a 40% smaller footprint than SOT-23-3 packages.
- Active output circuitry with a very sharp turn-on characteristic, making it an excellent replacement for low-voltage Zener diodes.
Applications
- Isolated feedback circuits for 3V to 3.3V switching-mode power supplies when used with an optocoupler.
- On-board regulation and adjustable power supplies.
- Replacement for low-voltage Zener diodes in various applications.
- Voltage regulation in industrial and commercial temperature ranges.
Q & A
- What is the reference voltage of the TLV431ACDBZR?
The reference voltage (VREF) is 1.24V.
- What is the adjustable output voltage range of the TLV431ACDBZR?
The output voltage can be set to any value between VREF (1.24V) and 6V using two external resistors.
- What is the typical temperature drift of the TLV431ACDBZR?
The typical temperature drift is 4mV (0°C to 70°C), 6mV (–40°C to 85°C), and 11mV (–40°C to 125°C).
- What is the operational cathode current of the TLV431ACDBZR?
The operational cathode current is 80µA typical.
- What is the output impedance of the TLV431ACDBZR?
The output impedance is 0.25Ω typical.
- In what package types is the TLV431ACDBZR available?
The TLV431ACDBZR is available in SOT-23-3 (DBZ) and other packages such as SC-70 and SOT-89.
- What are the operating temperature ranges for the TLV431ACDBZR?
The operating temperature ranges are –40°C to 125°C (TLV431Q), –40°C to 85°C (TLV431I), and 0°C to 70°C (TLV431C).
- Can the TLV431ACDBZR be used as a replacement for Zener diodes?
Yes, the TLV431ACDBZR can be used as a replacement for low-voltage Zener diodes due to its active output circuitry and sharp turn-on characteristic.
- What are some common applications of the TLV431ACDBZR?
Common applications include isolated feedback circuits for switching-mode power supplies, on-board regulation, and adjustable power supplies.
- How does the TLV431ACDBZR compare to other shunt regulators like the TL431?
The TLV431ACDBZR operates at a lower voltage (1.24V) compared to the TL431 and offers better thermal stability and accuracy.
