Overview
The TL431ACDG4, produced by Texas Instruments, is a three-terminal adjustable shunt regulator known for its high precision and thermal stability. This device is part of the TL431 series, which includes various grades with different initial tolerances. The TL431ACDG4 is particularly suited for applications requiring adjustable output voltages and high stability over a wide temperature range.
The device operates from −40°C to 125°C, making it suitable for automotive, commercial, and military applications. It features active output circuitry that provides a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many scenarios.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Input Voltage (Vref) | 2.44 | 2.495 | 2.55 | V |
| Reference Voltage Tolerance at 25°C | - | - | - | 0.5% (B grade), 1% (A grade), 2% (Standard grade) |
| Adjustable Output Voltage | Vref | - | 36 | V |
| Operating Temperature Range | -40 | - | 125 | °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 |
| Package | - | SOIC (D) | - | - |
| Pins | - | 8 | - | - |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V using two external resistors.
- High Precision: Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Wide Operating Temperature Range: Operates from −40°C to 125°C, making it suitable for various environments.
- Low Output Noise: Features low output noise, enhancing the overall performance of the circuit.
- Low Output Impedance: Typical output impedance of 0.2 Ω.
- Sink-Current Capability: Can sink currents from 1 mA to 100 mA.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- On-Board Regulation: Suitable for on-board voltage regulation due to its adjustable output voltage and high stability.
- Adjustable Power Supplies: Used in adjustable power supplies where precise voltage regulation is required.
- Switching Power Supplies: Ideal for switching power supplies due to its sharp turn-on characteristic and low output impedance.
- Automotive and Industrial Applications: AEC-Q100 qualified, making it suitable for automotive and industrial environments.
Q & A
- What is the TL431ACDG4 used for?
The TL431ACDG4 is used as a three-terminal adjustable shunt regulator, often replacing Zener diodes in applications requiring precise voltage regulation.
- What is the adjustable output voltage range of the TL431ACDG4?
The output voltage can be set to any value between Vref (approximately 2.5 V) and 36 V using two external resistors.
- What are the different grades of the TL431 series?
The TL431 series is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C, denoted as B, A, and standard grades, respectively.
- What is the operating temperature range of the TL431ACDG4?
The device operates from −40°C to 125°C.
- What is the typical output impedance of the TL431ACDG4?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431ACDG4?
The device can sink currents from 1 mA to 100 mA.
- Is the TL431ACDG4 suitable for automotive applications?
Yes, it is AEC-Q100 qualified and operates over a wide temperature range, making it suitable for automotive applications.
- What package type is the TL431ACDG4 available in?
The TL431ACDG4 is available in an SOIC (D) package with 8 pins.
- What are some common applications of the TL431ACDG4?
Common applications include on-board regulation, adjustable power supplies, and switching power supplies.
- Does the TL431ACDG4 have low output noise?
Yes, the device features low output noise.
