Overview
The TL431IDR is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 series, known for its precision and versatility. This device offers specified thermal stability over a wide range of temperatures, making it suitable for various applications including automotive, commercial, and military environments. The TL431IDR can be used to replace Zener diodes in many scenarios due to its sharp turn-on characteristic and adjustable output voltage range from approximately 2.5V to 36V, settable with two external resistors.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B grade), 1% (A grade), 2% (Standard grade) | % |
| Adjustable Output Voltage | Vref to 36V | V |
| Operating Temperature Range | −40°C to 125°C | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Typical Output Impedance | 0.2 Ω | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Cathode to Anode Voltage | 37 V | V |
| Reference Input Current Range | −0.05 to +10 mA | mA |
| Operating Junction Temperature Range | 150 °C | °C |
Key Features
- Three-terminal adjustable shunt regulator with specified thermal stability.
- Adjustable output voltage from approximately 2.5V to 36V using two external resistors.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability from 1 mA to 100 mA.
- Operation from −40°C to 125°C, making it suitable for a wide range of applications.
- Available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- Active output circuitry providing a very sharp turn-on characteristic, ideal for replacing Zener diodes.
Applications
- Rack server power supplies.
- Industrial AC/DC power supplies.
- AC inverter and VF drives.
- Servo drive control modules.
- Notebook PC power adapter designs.
- On-board regulation, adjustable power supplies, and switching power supplies.
Q & A
- What is the TL431IDR?
The TL431IDR is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431IDR?
The output voltage can be set to any value between approximately 2.5V and 36V using two external resistors.
- What are the temperature ranges for the TL431IDR?
The device operates from −40°C to 125°C.
- What are the initial tolerance grades available for the TL431IDR?
The device is available in three grades with initial tolerances of 0.5%, 1%, and 2% at 25°C.
- What is the typical output impedance of the TL431IDR?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431IDR?
The sink-current capability ranges from 1 mA to 100 mA.
- Can the TL431IDR replace Zener diodes in some applications?
Yes, the TL431IDR can replace Zener diodes due to its sharp turn-on characteristic and adjustable output voltage.
- What are some common applications of the TL431IDR?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverters, servo drive control modules, and notebook PC power adapter designs.
- What is the maximum cathode to anode voltage for the TL431IDR?
The maximum cathode to anode voltage is 37 V.
- What is the operating junction temperature range for the TL431IDR?
The operating junction temperature range is up to 150 °C.
