Overview
The TLV431BCDBZR is a low-voltage adjustable precision shunt regulator produced by Texas Instruments. It is part of the TLV431 family, which is known for its low power consumption and versatility in various applications. This device operates with a reference voltage of 1.24V, making it suitable for low-voltage adjustability and applications requiring precision voltage regulation. The TLV431BCDBZR is particularly useful in industrial, automotive, telecom, and computing equipment due to its wide operating temperature range and high accuracy.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage (VREF) | 1.234 to 1.246 | V |
| Reference Voltage Tolerance at 25°C | 0.5% | |
| Output Voltage Range | 1.24V to 6V | V |
| Minimum Cathode Current (Ik(min)) | 100µA | A |
| Maximum Operating Current | Up to 150µA over temperature | A |
| Output Impedance | Typically 0.25Ω | Ω |
| Operating Temperature Range | -40°C to 125°C (Q grade) | °C |
| Package Type | SOT-23-3 (DBZ) |
Key Features
- Low-voltage operation with a reference voltage of 1.24V
- Adjustable output voltage from 1.24V to 6V using external resistors
- High accuracy with reference voltage tolerances as low as 0.5% at 25°C
- Low minimum cathode current of 100µA
- Typical output impedance of 0.25Ω
- Active output circuitry providing a sharp turn-on characteristic
- Ideal for replacing low-voltage Zener diodes
- Operates in open-loop and closed-loop configurations
- AEC-Q100 qualified for automotive applications (Q grade)
Applications
- Secondary side regulation in flyback switching-mode power supplies (SMPS)
- Voltage monitoring and regulation in industrial, automotive, telecom, and computing equipment
- Replacement for low-voltage Zener diodes in on-board regulation and adjustable power supplies
- Comparator with integrated reference for voltage monitoring and control
- Isolated feedback circuits for 3V to 3.3V switching-mode power supplies when used with an optocoupler
Q & A
- What is the reference voltage of the TLV431BCDBZR?
The reference voltage (VREF) of the TLV431BCDBZR is 1.24V with a tolerance of 0.5% at 25°C. - What is the adjustable output voltage range of the TLV431BCDBZR?
The output voltage can be adjusted from 1.24V to 6V using external resistors. - What is the minimum cathode current required for the TLV431BCDBZR?
The minimum cathode current (Ik(min)) required is 100µA. - What is the typical output impedance of the TLV431BCDBZR?
The typical output impedance is 0.25Ω. - Can the TLV431BCDBZR be used in automotive applications?
Yes, the TLV431BCDBZR (Q grade) is AEC-Q100 qualified for automotive applications. - What are the common applications of the TLV431BCDBZR?
Common applications include secondary side regulation in flyback SMPS, voltage monitoring, replacing low-voltage Zener diodes, and isolated feedback circuits. - How does the TLV431BCDBZR operate in open-loop and closed-loop configurations?
In open-loop, it operates as a comparator, and in closed-loop, it functions as a shunt regulator or error amplifier. - What is the operating temperature range of the TLV431BCDBZR?
The operating temperature range is -40°C to 125°C for the Q grade. - What package type is the TLV431BCDBZR available in?
The TLV431BCDBZR is available in the SOT-23-3 (DBZ) package. - Can the TLV431BCDBZR be used in place of a Zener diode?
Yes, it is an excellent replacement for low-voltage Zener diodes due to its active output circuitry and sharp turn-on characteristic.
