Overview
The TL431BID, produced by Texas Instruments, is a three-terminal adjustable precision shunt regulator. This device is part of the TL431 family, known for its thermal stability across various temperature ranges, including automotive, commercial, and military environments. The TL431BID offers adjustable output voltage, low output noise, and a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage Tolerance at 25°C | - | 0.5% | - | - |
| Adjustable Output Voltage | Vref (approximately 2.5V) | - | 36V | V |
| Operating Temperature Range | -40°C | - | 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 | - | 100 mA | mA |
| Cathode Voltage | - | - | 37 V | V |
| Reference Input Current | -0.05 mA | - | 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.
- Sharp turn-on characteristic, making it suitable for replacing Zener diodes.
- Available in three grades with initial tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- Operates over a wide temperature range from -40°C to 125°C.
- Internally compensated for stability without an output capacitor.
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 TL431BID?
The TL431BID is a three-terminal adjustable precision shunt regulator produced by Texas Instruments.
- What is the adjustable output voltage range of the TL431BID?
The output voltage can be adjusted from Vref (approximately 2.5V) to 36V using two external resistors.
- What are the temperature ranges for the TL431BID?
The device operates from -40°C to 125°C.
- What is the typical output impedance of the TL431BID?
The typical output impedance is 0.2 Ω.
- What is the sink-current capability of the TL431BID?
The sink-current capability ranges from 1 mA to 100 mA.
- What are the initial tolerance grades available for the TL431BID?
The device is available in three grades with initial tolerances of 0.5% (B grade), 1% (A grade), and 2% (Standard grade) at 25°C.
- Can the TL431BID replace Zener diodes in some applications?
Yes, the TL431BID has a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
- Does the TL431BID require an external capacitor for stability?
No, the TL431BID is internally compensated and does not require an external capacitor for stability.
- What are some common applications of the TL431BID?
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.
- What is the reference voltage tolerance for the B grade TL431BID at 25°C?
The reference voltage tolerance for the B grade is 0.5% at 25°C.
