Overview
The TL431IPK3, produced by Texas Instruments, is a three-terminal adjustable shunt regulator. It is part of the TL431 family, known for its precision and adjustability. This device is designed to provide a stable reference voltage and can be used in a variety of power management applications. The TL431IPK3 offers adjustable output voltage, low output noise, and high thermal stability, making it suitable for automotive, commercial, and industrial environments.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (Vref) | 2.44 | 2.495 | 2.55 | mV |
| Cathode Voltage (VKA) | - | - | 37 | V |
| Cathode Current Range (IKA) | 1 | - | 100 | mA |
| Reference Input Current Range (Iref) | -0.05 | - | 10 | mA |
| Operating Junction Temperature (TJ) | - | - | 150 | °C |
| Operating Ambient Temperature Range (TA) | -40 | - | 125 | °C |
| Output Impedance | - | 0.2 | - | Ω |
| Temperature Drift (TL43xB) | - | 6 mV (C temp), 14 mV (I temp, Q temp) | - | mV |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- Precision Reference Voltage: Reference voltage tolerance at 25°C is available in 0.5% (B grade), 1% (A grade), and 2% (Standard grade) options.
- Low Output Noise: The device features low output noise, making it suitable for noise-sensitive applications.
- Low Output Impedance: Typical output impedance is 0.2Ω.
- Sink-Current Capability: The device can sink current from 1 mA to 100 mA.
- Thermal Stability: Operates over a wide temperature range with specified thermal stability: TL43xxC (0°C to 70°C), TL43xxI (–40°C to 85°C), and TL43xxQ (–40°C to 125°C).
Applications
- Rack Server Power: Used in power supply designs for rack servers.
- Industrial AC/DC: Suitable for industrial AC/DC power supplies.
- AC Inverter & VF Drives: Applied in AC inverter and variable frequency drive systems.
- Servo Drive Control Module: Used in servo drive control modules.
- Notebook PC Power Adapter Design: Utilized in power adapter designs for notebook PCs.
- On-Board Regulation: Excellent for on-board voltage regulation.
- Adjustable Power Supplies: Ideal for adjustable power supply designs.
- Switching Power Supplies: Used in switching power supply applications.
Q & A
- What is the TL431IPK3?
The TL431IPK3 is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431IPK3?
The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- What are the temperature ranges for the TL431IPK3?
The device operates over a wide temperature range: TL43xxC (0°C to 70°C), TL43xxI (–40°C to 85°C), and TL43xxQ (–40°C to 125°C).
- What is the typical output impedance of the TL431IPK3?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431IPK3?
The device can sink current from 1 mA to 100 mA.
- What are the common applications of the TL431IPK3?
Common applications include rack server power, industrial AC/DC, AC inverter & VF drives, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431IPK3 compare to Zener diodes?
The TL431IPK3 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 TL431IPK3 based on reference voltage tolerance?
The device is available in three grades: 0.5% (B grade), 1% (A grade), and 2% (Standard grade) reference voltage tolerance at 25°C.
- What is the operating junction temperature range of the TL431IPK3?
The operating junction temperature range is up to 150°C, though operating at the maximum can affect reliability.
- How does the TL431IPK3 handle noise in applications?
The device features low output noise, making it suitable for noise-sensitive applications.
