Overview
The TL431CPWR is a three-terminal adjustable shunt regulator manufactured by Texas Instruments. It is part of the TL431 series, known for its precision and versatility in voltage regulation. This device is designed to provide a stable reference voltage and can be adjusted to output voltages between approximately 2.5V and 36V using two external resistors. The TL431CPWR is suitable for a wide range of applications, including on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Typical Value | Unit |
|---|---|---|
| Reference Voltage (Vref) | 2.495 | mV |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | % |
| Adjustable Output Voltage | Vref to 36V | V |
| Operating Temperature Range | −40°C to 125°C (Q grade) | °C |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) | mV |
| Output Impedance | 0.2Ω | Ω |
| Sink-Current Capability | 1mA to 100mA | mA |
| Package Type | PDIP (P) |
Key Features
- Adjustable output voltage from approximately 2.5V to 36V using two external resistors.
- Low output noise and typical output impedance of 0.2Ω.
- Sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Specified thermal stability over automotive, commercial, and military temperature ranges.
- Low output drift versus temperature, ensuring good stability over the entire temperature range.
- Available in various packages, including PDIP, SOIC, and SOT-23.
Applications
- On-board voltage regulation.
- Adjustable power supplies.
- Switching power supplies.
- Replacement for Zener diodes in many applications.
- Isolated feedback circuits in switching-mode power supplies when used with an optocoupler.
Q & A
- What is the adjustable output voltage range of the TL431CPWR?
The output voltage can be adjusted from approximately 2.5V to 36V using two external resistors.
- What are the reference voltage tolerances for the TL431CPWR?
The reference voltage tolerances are 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the typical output impedance of the TL431CPWR?
The typical output impedance is 0.2Ω.
- What is the operating temperature range for the TL431CPWR?
The device operates from −40°C to 125°C (Q grade).
- What is the sink-current capability of the TL431CPWR?
The sink-current capability ranges from 1mA to 100mA.
- Can the TL431CPWR replace Zener diodes in some applications?
- What packages are available for the TL431CPWR?
The device is available in various packages, including PDIP, SOIC, and SOT-23.
- How does the TL431CPWR ensure thermal stability?
The device has specified thermal stability over applicable automotive, commercial, and military temperature ranges.
- What is the typical temperature drift for the TL431CPWR?
The typical temperature drift is 6mV (C temp) and 14mV (I temp, Q temp).
- Is there a design calculator available for the TL431CPWR?
