Overview
The TL431CPW is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 family, known for its high precision and thermal stability. This device is designed to provide a stable voltage reference and can be used in a variety of applications, including on-board regulation, adjustable power supplies, and switching power supplies.
The TL431CPW offers adjustable output voltage from approximately 2.5V to 36V, settable with two external resistors. It features active output circuitry that provides a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Input Voltage (Vref) | 2.44 | 2.495 | 2.55 | V |
| Output Voltage Range | 2.5 | - | 36 | V |
| Sink Current Capability | 1 | - | 100 | mA |
| Typical Output Impedance | - | 0.2 | - | Ω |
| Operating Temperature Range | 0 | - | 70 | °C |
| Reference Voltage Tolerance at 25°C | - | - | 0.5% (B Grade), 1% (A Grade), 2% (Standard Grade) | - |
Key Features
- Adjustable output voltage from approximately 2.5V to 36V with two external resistors.
- Reference voltage tolerance at 25°C: 0.5% (B Grade), 1% (A Grade), 2% (Standard Grade).
- Operation from −40°C to 125°C for automotive versions.
- Typical temperature drift: 6mV (C temp), 14mV (I temp, Q temp).
- Low output noise.
- Typical output impedance of 0.2Ω.
- Sink-current capability: 1mA to 100mA.
- Active output circuitry with a sharp turn-on characteristic.
Applications
- On-board voltage regulation.
- Adjustable power supplies.
- Switching power supplies.
- Industrial and automotive applications.
- Undervoltage and overvoltage detection circuits.
Q & A
- What is the TL431CPW used for?
The TL431CPW is used as an adjustable shunt voltage regulator, providing a stable voltage reference in various applications such as on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431CPW?
The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- What are the different grades of the TL431 based on reference voltage tolerance?
The TL431 comes in three grades: B Grade (0.5% tolerance), A Grade (1% tolerance), and Standard Grade (2% tolerance) at 25°C.
- What is the typical output impedance of the TL431CPW?
The typical output impedance is 0.2Ω.
- What is the operating temperature range for the TL431CPW?
The operating temperature range is from 0°C to 70°C, with extended ranges for automotive versions.
- Can the TL431CPW replace Zener diodes in some applications?
Yes, the TL431CPW can replace Zener diodes due to its sharp turn-on characteristic and adjustable output voltage.
- What is the sink current capability of the TL431CPW?
The sink current capability ranges from 1mA to 100mA.
- Is the TL431CPW suitable for automotive applications?
Yes, the TL431CPW, especially in its automotive versions, is suitable for automotive applications with an extended temperature range from −40°C to +125°C.
- How does the TL431CPW handle temperature drift?
The TL431CPW has a low temperature drift, with typical values of 6mV (C temp) and 14mV (I temp, Q temp).
- Can the TL431CPW be used for undervoltage and overvoltage detection?
Yes, the TL431CPW can be used in circuits for undervoltage and overvoltage detection due to its adjustable threshold and stable voltage reference.
