Overview
The TL431IPK is a precision programmable reference voltage regulator produced by Texas Instruments. This device is part of the TL431 series, known for its adjustable output voltage and high thermal stability. The TL431IPK is packaged in a 4-pin SOT-89 (PK) package and is designed for automotive, commercial, and industrial applications. It offers a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in various power supply and regulation applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 2% (Standard grade) | - |
| Adjustable Output Voltage | 2.495V to 36V | V |
| Operating Temperature Range | -40°C to 125°C | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Output Impedance | 0.2 Ω (Typical) | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Cathode Voltage (VKA) | 37 V (Max) | V |
| Reference Input Current (Iref) | -0.05 to 10 mA | mA |
| Operating Junction Temperature (TJ) | 150 °C (Max) | °C |
| Package Type | SOT-89 (PK) | - |
Key Features
- Adjustable output voltage from 2.495V to 36V using two external resistors.
- High thermal stability over a wide temperature range (-40°C to 125°C).
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability from 1 mA to 100 mA.
- Sharp turn-on characteristic, making it suitable for replacing Zener diodes.
- Available in different grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
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 TL431IPK used for?
The TL431IPK is used as a precision programmable reference voltage regulator, often replacing Zener diodes in various power supply and regulation applications.
- What is the adjustable output voltage range of the TL431IPK?
The adjustable output voltage range of the TL431IPK is from 2.495V to 36V.
- What are the operating temperature ranges for the TL431IPK?
The TL431IPK operates from -40°C to 125°C.
- What is the typical output impedance of the TL431IPK?
The typical output impedance of the TL431IPK is 0.2 Ω.
- What is the sink-current capability of the TL431IPK?
The sink-current capability of the TL431IPK ranges from 1 mA to 100 mA.
- What package type is the TL431IPK available in?
The TL431IPK is available in a 4-pin SOT-89 (PK) package.
- What are some common applications of the TL431IPK?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverters, servo drive control modules, and notebook PC power adapter designs.
- How does the TL431IPK compare to Zener diodes?
The TL431IPK offers a 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 is available in different grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- What is the maximum cathode voltage for the TL431IPK?
The maximum cathode voltage (VKA) for the TL431IPK is 37 V.
