Overview
The TL431BCPWE4, 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 family, which includes the TL431 and TL432 models, offering similar functionality but with different pinouts for various packages. The TL431BCPWE4 is designed to operate over a wide temperature range, making it suitable for automotive, commercial, and military applications.
The device features an adjustable output voltage that can be set between the reference voltage (approximately 2.5V) and 36V using two external resistors. This adjustability, combined with its low output impedance and sharp turn-on characteristic, makes the TL431BCPWE4 an excellent replacement for Zener diodes in many applications.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | - | % |
| Adjustable Output Voltage | Vref (2.5V) | - | 36V | V |
| Operating Temperature Range | -40°C | - | 125°C | °C |
| Typical Temperature Drift | - | 6 mV (C temp), 14 mV (I temp, Q temp) | - | mV |
| Output Impedance | - | 0.2Ω | - | Ω |
| Sink-Current Capability | 1 mA | - | 100 mA | mA |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors.
- High Precision: Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Low Output Noise: Features low output noise, making it suitable for applications requiring stable voltage regulation.
- Low Output Impedance: Typical output impedance of 0.2Ω.
- Wide Temperature Range: Operates from -40°C to 125°C, ensuring stability across various environmental conditions.
- Sharp Turn-On Characteristic: Active output circuitry provides a very sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
- Sink-Current Capability: Can sink currents from 1 mA to 100 mA.
Applications
- Rack Server Power: Used in power supply designs for rack servers due to its high precision and stability.
- Industrial AC/DC Power Supplies: Suitable for industrial power supplies requiring adjustable and stable voltage regulation.
- AC Inverter & VF Drives: Applied in AC inverter and variable frequency drive systems for precise voltage control.
- Servo Drive Control Modules: Used in servo drive control modules to ensure stable and adjustable voltage outputs.
- Notebook PC Power Adapters: Utilized in power adapter designs for notebook PCs due to its compact size and high performance.
Q & A
- What is the TL431BCPWE4 used for?
The TL431BCPWE4 is used as a three-terminal adjustable shunt regulator, often replacing Zener diodes in applications requiring adjustable and stable voltage regulation.
- What is the adjustable output voltage range of the TL431BCPWE4?
The output voltage can be set to any value between the reference voltage (approximately 2.5V) and 36V using two external resistors.
- What are the temperature ranges for the TL431BCPWE4?
The device operates from -40°C to 125°C, ensuring stability across various environmental conditions.
- What is the typical output impedance of the TL431BCPWE4?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431BCPWE4?
The device can sink currents from 1 mA to 100 mA.
- What are the precision grades available for the TL431BCPWE4?
The device is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Can the TL431BCPWE4 be used in place of Zener diodes?
- What are some common applications of the TL431BCPWE4?
- How does the TL431BCPWE4 ensure thermal stability?
- What is the reference voltage tolerance of the TL431BCPWE4 at 25°C?
