Overview
The TL431CLPRE3, produced by Texas Instruments, is a three-terminal adjustable shunt regulator. This device is part of the TL431 family, known for its precision and versatility in various electronic applications. The TL431CLPRE3 offers adjustable output voltage, high thermal stability, and low output noise, making it an excellent choice for on-board regulation, adjustable power supplies, and switching power supplies. It is available in the TO-92 package and is suitable for a wide range of temperature conditions.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B Grade), 1% (A Grade), 2% (Standard Grade) | Varying grades for different precision needs |
| Adjustable Output Voltage | Vref to 36 V | Settable with two external resistors |
| Operating Temperature Range | −40°C to 125°C (TL43xxQ), 0°C to 70°C (TL43xxC), −40°C to 85°C (TL43xxI) | Different temperature ranges for various applications |
| Typical Temperature Drift | 6 mV (C Temp), 14 mV (I Temp, Q Temp) | Low drift ensures stability over temperature range |
| Output Impedance | 0.2 Ω (Typical) | Low impedance for efficient operation |
| Sink-Current Capability | 1 mA to 100 mA | Wide range of current handling |
| Package Type | TO-92 | Compact package for various applications |
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 Thermal Stability: Operates over a wide temperature range with low temperature drift, ensuring good stability.
- Low Output Noise: Provides low noise output, making it suitable for sensitive applications.
- Low Output Impedance: Typical output impedance of 0.2 Ω for efficient current handling.
- Sink-Current Capability: Can handle 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 regulating voltage on PCBs.
- Adjustable Power Supplies: Used in power supplies where adjustable output voltage is required.
- Switching Power Supplies: Ideal for use in switching power supplies due to its sharp turn-on characteristic.
- Secondary Side Regulation in Flyback SMPSs: Used for regulating the output voltage in flyback switch-mode power supplies.
- Zener Replacement: Can replace Zener diodes in many applications.
- Voltage Monitoring: Used in voltage monitoring circuits.
- Comparator with Integrated Reference: Can be used as a comparator with an integrated reference voltage.
Q & A
- What is the TL431CLPRE3 used for?
The TL431CLPRE3 is used as a three-terminal adjustable shunt regulator in various applications such as on-board regulation, adjustable power supplies, and switching power supplies.
- What is the adjustable output voltage range of the TL431CLPRE3?
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 temperature ranges for the TL431 devices?
The TL431 devices are available in different temperature ranges: 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 TL431CLPRE3?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431CLPRE3?
The device can handle sink currents from 1 mA to 100 mA.
- Can the TL431CLPRE3 replace Zener diodes?
- What is the reference voltage tolerance at 25°C for the TL431CLPRE3?
The reference voltage tolerance at 25°C is 0.5% (B Grade), 1% (A Grade), and 2% (Standard Grade).
- What are some common applications of the TL431CLPRE3?
- What package type is the TL431CLPRE3 available in?
The TL431CLPRE3 is available in the TO-92 package.
- How does the TL431CLPRE3 handle temperature drift?
