Overview
The TL431BCDBZR is a three-terminal adjustable shunt regulator produced by Texas Instruments. This device is part of the TL431 family, known for its precision and versatility in voltage regulation. The TL431BCDBZR offers adjustable output voltage ranging from approximately 2.5 V (Vref) to 36 V, settable using two external resistors. It is characterized by its high thermal stability across various temperature ranges, making it suitable for automotive, commercial, and military applications.
The device features a sharp turn-on characteristic, low output noise, and a typical output impedance of 0.2 Ω, making it an excellent replacement for Zener diodes in many applications such as on-board regulation, adjustable power supplies, and switching power supplies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Voltage Tolerance at 25°C | 0.5% | - |
| Adjustable Output Voltage Range | Vref (approximately 2.5 V) 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 | SOT23 | - |
| Package Size | 2.9 x 1.3 x 1 mm | mm |
Key Features
- Programmable output voltage up to 36 V using two external resistors.
- Three different reference voltage tolerances: 0.5%, 1%, and 2% at 25°C.
- Operation from -40°C to 125°C, ensuring stability across a wide temperature range.
- Low output noise and typical output impedance of 0.2 Ω.
- Sink-current capability from 1 mA to 100 mA.
- Sharp turn-on characteristic, making it a suitable replacement for Zener diodes.
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.
Q & A
- What is the adjustable output voltage range of the TL431BCDBZR?
The adjustable output voltage range is from approximately 2.5 V (Vref) to 36 V, settable using two external resistors.
- What are the reference voltage tolerances available for the TL431 family?
The reference voltage tolerances are 0.5%, 1%, and 2% at 25°C for the B, A, and standard grades, respectively.
- What is the operating temperature range of the TL431BCDBZR?
The operating temperature range is from -40°C to 125°C.
- What is the typical output impedance of the TL431BCDBZR?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BCDBZR?
The sink-current capability ranges from 1 mA to 100 mA.
- What package type and size does the TL431BCDBZR come in?
The TL431BCDBZR comes in an SOT23 package with dimensions of 2.9 x 1.3 x 1 mm.
- Can the TL431BCDBZR replace Zener diodes in certain applications?
- What are some common applications of the TL431BCDBZR?
- How does the TL431BCDBZR ensure thermal stability?
The device ensures thermal stability through its specified thermal stability over applicable automotive, commercial, and military temperature ranges.
- What is the dynamic cathode-anode impedance of the TL431BCDBZR?
The dynamic cathode-anode impedance is typically between 0.2 Ω and 0.5 Ω for frequencies less than 1 kHz.
