Overview
The TL431QDCKR is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 series, known for its specified thermal stability over a wide range of temperatures, making it suitable for automotive, commercial, and military applications. The device allows for adjustable output voltage between approximately 2.5V and 36V using two external resistors. It features active output circuitry that provides a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in various applications.
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 36 V | V |
| Operating Temperature Range | −40°C to 125°C | °C |
| Typical Temperature Drift | 6 mV (C temp), 14 mV (I temp, Q temp) | mV |
| Output Impedance | 0.2 Ω (Typical) | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Package Type | SOT-SC70 (DCK) | |
| Pins | 6 | |
| Lead Finish | Gold |
Key Features
- Reference voltage tolerance at 25°C: 0.5% (B grade), 1% (A grade), 2% (Standard grade)
- Adjustable output voltage: Vref to 36 V using two external resistors
- Operation from −40°C to 125°C, ensuring good stability over the entire temperature range
- Typical temperature drift: 6 mV (C temp), 14 mV (I temp, Q temp)
- Low output noise and 0.2 Ω typical output impedance
- Sink-current capability: 1 mA to 100 mA
Applications
- Rack server power supplies
- Industrial AC/DC power supplies
- AC inverter and variable frequency (VF) drives
- Servo drive control modules
- Notebook PC power adapter designs
- On-board regulation and adjustable power supplies
- Switching power supplies
Q & A
- What is the TL431QDCKR?
The TL431QDCKR is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431QDCKR?
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 TL431QDCKR?
The device operates from −40°C to 125°C.
- What are the reference voltage tolerances for the TL431QDCKR?
The reference voltage tolerances are 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What is the typical output impedance of the TL431QDCKR?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431QDCKR?
The sink-current capability ranges from 1 mA to 100 mA.
- In what package is the TL431QDCKR available?
The TL431QDCKR is available in the SOT-SC70 (DCK) package with 6 pins.
- What are some common applications of the TL431QDCKR?
Common applications include rack server power supplies, industrial AC/DC power supplies, AC inverter and VF drives, servo drive control modules, and notebook PC power adapter designs.
- Can the TL431QDCKR replace Zener diodes in some applications?
Yes, the TL431QDCKR can replace Zener diodes in many applications due to its sharp turn-on characteristic and active output circuitry.
- What is the lead finish of the TL431QDCKR?
The lead finish of the TL431QDCKR is gold.
