Overview
The TL431BQDE4 is a three-terminal adjustable shunt regulator produced by Texas Instruments. It is part of the TL431 and TL432 family, known for their precision and thermal stability over a wide range of temperatures. This device is particularly useful for applications requiring adjustable output voltages and high stability.
The TL431BQDE4 offers adjustable output voltage from the reference voltage (approximately 2.5V) up to 36V, set using two external resistors. It is characterized by its low output noise, sharp turn-on characteristic, and low output impedance, making it an excellent replacement for Zener diodes in many applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% (B Grade) | % |
| Adjustable Output Voltage Range | 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 | Ω |
| Sink-Current Capability | 1 mA to 100 mA | mA |
| Cathode Voltage | Up to 37 V | V |
| Reference Input Current | −0.05 to 10 mA | mA |
Key Features
- Adjustable output voltage from Vref (approximately 2.5V) to 36V using two external resistors.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability ranging from 1 mA to 100 mA.
- Operation over a wide temperature range from −40°C to 125°C.
- Sharp turn-on characteristic, making it suitable for replacing Zener diodes.
- Available in three grades with different reference voltage tolerances: 0.5% (B grade), 1% (A grade), and 2% (Standard grade).
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, adjustable power supplies, and switching power supplies.
- Precision current limiter and precision constant current sink applications.
- Isolated feedback loop for Switch Mode Power Supplies (SMPS).
Q & A
- What is the TL431BQDE4?
The TL431BQDE4 is a three-terminal adjustable shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BQDE4?
The output voltage can be adjusted from the reference voltage (approximately 2.5V) up to 36V using two external resistors.
- What are the temperature ranges for the TL431BQDE4?
The device operates from −40°C to 125°C.
- What is the typical output impedance of the TL431BQDE4?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BQDE4?
The sink-current capability ranges from 1 mA to 100 mA.
- What are the reference voltage tolerances available for the TL431BQDE4?
The device is available in three grades with reference voltage tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- What are some common applications of the TL431BQDE4?
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 TL431BQDE4 replace Zener diodes in some applications?
- Is the TL431BQDE4 suitable for automotive applications?
- What is the typical temperature drift of the TL431BQDE4?
The typical temperature drift is 6 mV (C temp) and 14 mV (I temp, Q temp).
- Is the TL431BQDE4 AEC-Q100 qualified?
