Overview
The TL431CD is a three-terminal adjustable shunt regulator produced by Fairchild Semiconductor. This device is part of the TL431 series, known for its thermal stability over a wide range of operating temperatures. It is designed to provide a programmable output voltage, making it versatile for various applications. The TL431CD is particularly useful in scenarios where a stable voltage reference is required, and it can replace Zener diodes in many cases due to its sharp turn-on characteristic and low output impedance.
Key Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Cathode Voltage | VKA | 37 | V |
| Cathode Current Range (Continuous) | IKA | -100 to +150 | mA |
| Reference Input Current Range | IREF | -0.05 to +10 | mA |
| Power Dissipation (D, LP Suffix Package) | PD | 770 | mW |
| Power Dissipation (P Suffix Package) | PD | 1000 | mW |
| Operating Temperature Range | TOPR | -25 to +85 | °C |
| Junction Temperature | TJ | 150 | °C |
| Storage Temperature Range | TSTG | -65 to +150 | °C |
| Output Voltage Range | VO | 2.5 to 36 | V |
| Output Impedance (Typical) | Zo | 0.2 | Ω |
| Sink Current Capability | IKA | 1 to 100 | mA |
| Reference Voltage Tolerance at 25°C | Vref | 2% (Standard Grade) |
Key Features
- Programmable Output Voltage: The output voltage can be set to any value between Vref (approximately 2.5V) and 36V using two external resistors.
- Low Dynamic Output Impedance: Typical output impedance of 0.2Ω, ensuring stable voltage regulation.
- Sink Current Capability: Can sink currents from 1mA to 100mA, making it suitable for a wide range of applications.
- Temperature Stability: Guaranteed thermal stability over the full rated operating temperature range, with a typical temperature drift of 50ppm/°C.
- Low Output Noise: Features low output noise voltage, enhancing the overall performance in noise-sensitive applications.
- Fast Turn-on Response: 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 in various electronic systems.
- Adjustable Power Supplies: Can be used in adjustable power supply circuits to provide a stable and adjustable output voltage.
- Switching Power Supplies: Used in switching power supplies to regulate output voltages efficiently.
- Current Limiting and Current Sources: Can be configured as current limiters or current sources due to its adjustable output and sink current capability).
Q & A
- What is the TL431CD used for?
The TL431CD is a three-terminal adjustable shunt regulator used for providing a programmable output voltage in various electronic applications.
- What is the output voltage range of the TL431CD?
The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- What is the typical output impedance of the TL431CD?
The typical output impedance is 0.2Ω.
- What is the sink current capability of the TL431CD?
The TL431CD can sink currents from 1mA to 100mA.
- What is the operating temperature range of the TL431CD?
The operating temperature range is from -25°C to +85°C.
- Can the TL431CD replace Zener diodes?
Yes, the TL431CD can replace Zener diodes in many applications due to its sharp turn-on characteristic and low output impedance.
- What are the different grades of the TL431CD based on reference voltage tolerance?
The TL431CD is available in three grades: B grade (0.5% tolerance), A grade (1% tolerance), and Standard grade (2% tolerance) at 25°C.
- What are some common applications of the TL431CD?
Common applications include on-board regulation, adjustable power supplies, and switching power supplies.
- What is the junction temperature of the TL431CD?
The junction temperature is 150°C.
- What is the storage temperature range for the TL431CD?
The storage temperature range is from -65°C to +150°C.
