Overview
The TL431CDR-J, 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 is widely used in various applications requiring adjustable voltage regulation. The TL431CDR-J offers a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many scenarios. It operates over a wide temperature range and is available in different grades, ensuring versatility and reliability in different environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | 8-SOIC (0.154, 3.90mm Width) | |
| Number of Pins | 8 | |
| Operating Temperature Range | 0°C to 70°C | °C |
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | % |
| Adjustable Output Voltage | Vref (approximately 2.5V) to 36V | V |
| Typical Output Impedance | 0.2Ω | Ω |
| Sink-Current Capability | 1mA to 100mA | mA |
| Typical Temperature Drift | 6mV (C temp), 14mV (I temp, Q temp) | mV |
| Max Output Current | 100mA | mA |
| Min Input Voltage | 2.495V | V |
| Max Input Voltage | 37V | V |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
- Operation from −40°C to 125°C, with specific models characterized for different temperature ranges (C, I, Q).
- Typical output impedance of 0.2Ω.
- Sink-current capability: 1mA to 100mA.
- Low output noise and low temperature drift.
- Active output circuitry with a sharp turn-on characteristic, making it an excellent replacement for Zener diodes.
Applications
- On-board regulation and voltage reference.
- Adjustable power supplies and switching power supplies.
- Rack server power and industrial AC/DC power supplies.
- AC inverter and variable frequency (VF) drives.
- Servo drive control modules and notebook PC power adapter designs.
Q & A
- What is the TL431CDR-J used for?
The TL431CDR-J is used as an adjustable shunt regulator, providing a stable voltage reference and adjustable output voltage in various applications.
- What is the adjustable output voltage range of the TL431CDR-J?
The output voltage can be adjusted from approximately 2.5V to 36V using two external resistors.
- What are the different temperature ranges for the TL431 devices?
The devices are characterized for operation from 0°C to 70°C (C grade), −40°C to 85°C (I grade), and −40°C to 125°C (Q grade).
- What is the typical output impedance of the TL431CDR-J?
The typical output impedance is 0.2Ω.
- What is the sink-current capability of the TL431CDR-J?
The sink-current capability ranges from 1mA to 100mA.
- Can the TL431CDR-J replace Zener diodes in some applications?
Yes, the TL431CDR-J can replace Zener diodes due to its sharp turn-on characteristic and adjustable output voltage.
- What are some common applications of the TL431CDR-J?
Common applications include on-board regulation, adjustable power supplies, switching power supplies, rack server power, and industrial AC/DC power supplies.
- How does the TL431CDR-J handle temperature drift?
The device has low output drift versus temperature, with typical temperature drift values of 6mV (C temp) and 14mV (I temp, Q temp).
- What is the package type of the TL431CDR-J?
The TL431CDR-J comes in an 8-SOIC (0.154, 3.90mm Width) package.
- What are the reference voltage tolerance grades available for the TL431CDR-J?
The device is available in three grades: 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
