Overview
The TL431AIDG4 is an adjustable precision shunt regulator produced by Texas Instruments. This device is part of the TL431 family, known for its versatility and precision in voltage regulation. The TL431AIDG4 is a three-terminal adjustable shunt regulator that can be set to any output voltage between the reference voltage (approximately 2.5 V) and 36 V using two external resistors. It is characterized by its low output noise, high stability, and wide operating temperature range, making it suitable for various applications in power supplies, voltage monitoring, and more.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | - |
| Adjustable Output Voltage | Vref to 36 V | - |
| Operating Temperature Range | −40°C to 125°C (TL43xxQ) | - |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | - |
| Output Impedance | 0.2 Ω (typical) | - |
| Sink-Current Capability | 1 mA to 100 mA | - |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between the reference voltage (approximately 2.5 V) and 36 V using two external resistors.
- Low Output Noise: The device features low output noise, making it suitable for applications requiring high stability.
- High Stability Over Temperature: The TL431AIDG4 has low output drift versus temperature, ensuring good stability over the entire temperature range.
- Wide Operating Temperature Range: The device operates from −40°C to 125°C, depending on the specific grade (TL43xxQ).
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
Applications
- Secondary Side Regulation in Flyback SMPSs: The TL431AIDG4 can be used for secondary side regulation in flyback switching mode power supplies (SMPSs).
- Zener Replacement: It is often used as a replacement for Zener diodes due to its adjustable output voltage and high stability.
- Voltage Monitoring: The device can be used in voltage monitoring circuits to detect undervoltage and overvoltage conditions.
- Comparator with Integrated Reference: It can be configured as a comparator with an integrated reference voltage, useful in various control and monitoring applications.
- Adjustable Power Supplies: The TL431AIDG4 is suitable for use in adjustable power supplies and switching power supplies.
Q & A
- What is the reference voltage tolerance of the TL431AIDG4 at 25°C?
The reference voltage tolerance at 25°C is 0.5% for the B grade, 1% for the A grade, and 2% for the standard grade.
- What is the adjustable output voltage range of the TL431AIDG4?
The output voltage can be set to any value between the reference voltage (approximately 2.5 V) and 36 V using two external resistors.
- What is the operating temperature range of the TL431AIDG4?
The device operates from −40°C to 125°C, depending on the specific grade (TL43xxQ).
- What is the typical output impedance of the TL431AIDG4?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431AIDG4?
The sink-current capability ranges from 1 mA to 100 mA.
- Can the TL431AIDG4 be used as a replacement for Zener diodes?
Yes, the TL431AIDG4 is often used as a replacement for Zener diodes due to its adjustable output voltage and high stability.
- What are some common applications of the TL431AIDG4?
Common applications include secondary side regulation in flyback SMPSs, Zener replacement, voltage monitoring, and use in adjustable power supplies and switching power supplies.
- How does the TL431AIDG4 handle temperature drift?
The device has low output drift versus temperature, ensuring good stability over the entire temperature range.
- Can the TL431AIDG4 be used in open-loop configuration?
Yes, the TL431AIDG4 can be used in both closed-loop and open-loop configurations, increasing its versatility.
- What tools are available for designing with the TL431AIDG4?
Texas Instruments provides a design calculator (TL431CALC) to help calculate component parameters for any desired output voltage.
