Overview
The TL431AQPK is a precision programmable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 family, known for their adjustable output voltage and thermal stability across various temperature ranges. This device is particularly useful in applications requiring a stable voltage reference with adjustable output capabilities.
The TL431AQPK operates within a wide temperature range, from -40°C to 125°C, making it suitable for automotive, commercial, and military applications. It features a typical output impedance of 0.2Ω and can sink currents from 1 mA to 100 mA, ensuring low noise and high stability in its output voltage.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | - | ±1% (A grade) | % |
| Adjustable Output Voltage | Vref (approx. 2.5V) | - | 36V | V |
| Operating Temperature Range | -40°C | - | 125°C | °C |
| Typical Temperature Drift | - | 6 mV (C temp), 14 mV (I temp, Q temp) | - | mV |
| Output Impedance | - | 0.2Ω | - | Ω |
| Sink-Current Capability | 1 mA | - | 100 mA | mA |
| Cathode Voltage | - | - | 37 V | V |
| Reference Input Current | -0.05 mA | - | 10 mA | mA |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- Low output noise and typical output impedance of 0.2Ω.
- Sink-current capability from 1 mA to 100 mA.
- Operation from -40°C to 125°C, making it suitable for various environmental conditions.
- Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Low output drift versus temperature, ensuring good stability over the entire temperature range.
- Active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
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.
- On-board regulation and adjustable power supplies.
- Switching power supplies.
Q & A
- What is the adjustable output voltage range of the TL431AQPK?
The TL431AQPK can be adjusted to output any voltage between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the operating temperature ranges for the TL431AQPK?
The TL431AQPK operates from -40°C to 125°C.
- What is the typical output impedance of the TL431AQPK?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431AQPK?
The device can sink currents from 1 mA to 100 mA.
- What are the initial tolerance grades available for the TL431AQPK?
The device is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- What are some common applications of the TL431AQPK?
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.
- Can the TL431AQPK replace Zener diodes in some applications?
Yes, the TL431AQPK can replace Zener diodes due to its active output circuitry and sharp turn-on characteristic.
- What is the reference voltage tolerance of the TL431AQPK at 25°C?
The reference voltage tolerance is ±1% for the A grade.
- How does the TL431AQPK handle temperature drift?
The device has low output drift versus temperature, ensuring good stability over the entire temperature range.
- What is the package type of the TL431AQPK?
The TL431AQPK is available in a SOT-89-3 package.
