Overview
The TL431ACPK is a precision programmable reference voltage source produced by Texas Instruments. It is a three-terminal adjustable shunt regulator known for its thermal stability across various temperature ranges, including automotive, commercial, and military environments. This device is highly versatile and can be used to set output voltages between approximately 2.5V and 36V using two external resistors. The TL431ACPK is part of the TL431 series, which is characterized by its low output noise, sharp turn-on characteristic, and low output impedance, making it an excellent replacement for Zener diodes in many applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | ±1% (A grade) | |
| Adjustable Output Voltage | Vref to 36V | |
| Operating Temperature Range | −40°C to 125°C | |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | |
| Output Impedance | 0.2 Ω (typical) | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Package Type | SOT89 | |
| Maximum Output Current | 100 mA | mA |
Key Features
- Precision programmable reference voltage with adjustable output between approximately 2.5V and 36V.
- Low output noise and typical output impedance of 0.2 Ω.
- Sharp turn-on characteristic, making it a suitable replacement for Zener diodes.
- Operates over a wide temperature range from −40°C to 125°C.
- Sink-current capability from 1 mA to 100 mA.
- Available in SOT89 package.
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 TL431ACPK used for?
The TL431ACPK is used as a precision programmable reference voltage source in various applications, including power supplies, servo drive control modules, and switching power supplies.
- What is the adjustable output voltage range of the TL431ACPK?
The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- What is the operating temperature range of the TL431ACPK?
The device operates from −40°C to 125°C.
- What is the typical output impedance of the TL431ACPK?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431ACPK?
The sink-current capability ranges from 1 mA to 100 mA.
- In what package is the TL431ACPK available?
The TL431ACPK is available in the SOT89 package.
- What are some common applications of the TL431ACPK?
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 TL431ACPK compare to Zener diodes?
The TL431ACPK has a sharp turn-on characteristic and low output noise, making it an excellent replacement for Zener diodes in many applications.
- What is the reference voltage tolerance of the TL431ACPK at 25°C?
The reference voltage tolerance is ±1% for the A grade.
- What is the maximum output current of the TL431ACPK?
The maximum output current is 100 mA.
