Overview
The TL431BIDM is a precision adjustable three-terminal shunt voltage regulator produced by Microsemi Corporation. This device is part of the TL431 series, known for its high accuracy and versatility. The TL431BIDM is pin-to-pin compatible with the industry standard TL431 and offers adjustable output voltage from 2.5V to 36V using two external resistors. It is particularly useful in applications requiring precise voltage regulation, such as in the feedback path of switching power supplies, overvoltage protection (OVP) crowbar circuits, and as references for analog-to-digital (A/D) and digital-to-analog (D/A) converters. Despite being marked as obsolete for new designs, it remains a reliable choice for existing projects due to its robust performance characteristics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Reference Type | Shunt | |
| Output Type | Adjustable | |
| Voltage - Output (Min) | 2.5 | V |
| Voltage - Output (Max) | 36 | V |
| Current - Output | 100 | mA |
| Tolerance | ±0.4% (TL431B) | |
| Temperature Coefficient | 30 ppm/°C (Typical) | |
| Current - Cathode | 1 mA to 100 mA | |
| Operating Temperature | 0°C to 70°C (TA) | |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | |
| Mounting Type | Surface Mount |
Key Features
- Adjustable output voltage from 2.5V to 36V using two external resistors.
- High accuracy with a tolerance of ±0.4% for the TL431B model.
- High current output capability of up to 100mA.
- Low supply and cathode currents to minimize power consumption.
- Low output impedance, typically less than 100mΩ for the TL431B model.
- Low output noise.
- Operating temperature range: 0°C to 70°C (TA).
- Packaged in an 8-SOIC (0.154", 3.90mm Width).
Applications
- Feedback path of switching power supplies.
- Overvoltage protection (OVP) crowbar circuits.
- References for analog-to-digital (A/D) and digital-to-analog (D/A) converters.
- Power supplies.
- Battery chargers.
- DC-DC converters.
- Audio amplifiers.
- Medical equipment.
Q & A
- What is the adjustable output voltage range of the TL431BIDM?
The TL431BIDM has an adjustable output voltage range from 2.5V to 36V. - What is the typical output impedance of the TL431BIDM?
The typical output impedance of the TL431BIDM is less than 100mΩ. - What is the maximum output current of the TL431BIDM?
The maximum output current of the TL431BIDM is 100mA. - What is the operating temperature range of the TL431BIDM?
The operating temperature range of the TL431BIDM is from 0°C to 70°C (TA). - What package type is the TL431BIDM available in?
The TL431BIDM is available in an 8-SOIC (0.154", 3.90mm Width) package. - Is the TL431BIDM suitable for new design projects?
No, the TL431BIDM is marked as obsolete for new designs, but it remains suitable for existing projects. - What are some common applications of the TL431BIDM?
Common applications include the feedback path of switching power supplies, OVP crowbar circuits, references for A/D and D/A converters, power supplies, battery chargers, and DC-DC converters. - What is the temperature coefficient of the TL431BIDM?
The temperature coefficient of the TL431BIDM is typically 30 ppm/°C. - How is the output voltage of the TL431BIDM adjusted?
The output voltage of the TL431BIDM is adjusted using two external resistors. - What is the tolerance of the TL431BIDM?
The tolerance of the TL431BIDM is ±0.4%.
