Overview
The TL431ACPSR is a precision programmable reference voltage regulator produced by Texas Instruments. It is part of the TL431 series, which includes three-terminal adjustable shunt regulators known for their thermal stability across various temperature ranges. These devices are designed to provide a stable reference voltage that can be adjusted using external resistors, making them versatile for a wide range of applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | 0.5% (B Grade), 1% (A Grade), 2% (Standard Grade) | - | % |
| Adjustable Output Voltage | Vref (approximately 2.5 V) | - | 36 V | V |
| Operating Temperature Range | 0°C | - | 70°C (TL431ACPSR) | °C |
| Typical Temperature Drift | - | 6 mV (C Temp), 14 mV (I Temp, Q Temp) | - | mV |
| Output Impedance | - | 0.2 Ω | - | Ω |
| Sink-Current Capability | 1 mA | - | 100 mA | mA |
| Cathode Voltage (VKA) | - | - | 37 V | V |
| Continuous Cathode Current Range | -100 mA | - | 150 mA | mA |
| Operating Junction Temperature Range | - | - | 150°C | °C |
Key Features
- Adjustable output voltage from Vref (approximately 2.5 V) to 36 V using external resistors.
- Reference voltage tolerance at 25°C: 0.5% (B Grade), 1% (A Grade), 2% (Standard Grade).
- Operation from 0°C to 70°C for the TL431ACPSR grade.
- Typical temperature drift: 6 mV (C Temp), 14 mV (I Temp, Q Temp).
- Low output noise.
- Typical output impedance of 0.2 Ω.
- Sink-current capability: 1 mA to 100 mA.
- Available in various high-density packages such as SOIC, TO-92, and SOT-89.
Applications
- Rack server power supplies.
- Industrial AC/DC power supplies.
- AC inverter and variable frequency (VF) drives.
- Servo drive control modules.
- Notebook PC power adapter designs.
- Onboard regulation and adjustable power supplies.
- Switching power supplies.
Q & A
- What is the TL431ACPSR?
The TL431ACPSR is a precision programmable reference voltage regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431ACPSR?
The output voltage can be adjusted from Vref (approximately 2.5 V) to 36 V using external resistors.
- What are the temperature ranges for the TL431ACPSR?
The TL431ACPSR operates from 0°C to 70°C.
- What is the typical output impedance of the TL431ACPSR?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431ACPSR?
The sink-current capability ranges from 1 mA to 100 mA.
- What are some common applications of the TL431ACPSR?
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.
- How does the TL431ACPSR compare to Zener diodes?
The TL431ACPSR has active output circuitry that provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- What are the different grades of the TL431 series?
The TL431 series includes B Grade (0.5% tolerance), A Grade (1% tolerance), and Standard Grade (2% tolerance).
- What is the maximum operating junction temperature for the TL431ACPSR?
The maximum operating junction temperature is 150°C.
- What packages are available for the TL431ACPSR?
The TL431ACPSR is available in packages such as SOIC, TO-92, and SOT-89.
- How is the reference voltage tolerance specified for the TL431ACPSR?
The reference voltage tolerance at 25°C is specified as 0.5% for B Grade, 1% for A Grade, and 2% for Standard Grade.
