The TL431K-A is a precision adjustable shunt regulator manufactured by UTC (Unisonic Technologies Co., Ltd.). It is designed for applications requiring precise and adjustable voltage references. As a variant of the TL431 family, it shares common characteristics like low temperature coefficient, sharp turn-on behavior, and low dynamic output impedance.

Applications:

• Precision Voltage Regulation
• Current Limiting Circuits
• Voltage Monitoring Systems
• Overvoltage Protection
• Adjustable Power Supplies
• Switching Regulators
• Linear Regulators
• Battery Chargers

Features:

• Programmable Output Voltage: Output voltage can be adjusted from Vref (approximately 2.5V) to 36V using two external resistors.
• Low Dynamic Output Impedance: Maintains stable regulation under varying load conditions.
• Sink Current Capability: Usually around 100mA, depending on the exact specifications in the datasheet.
• Low Output Noise
• Wide Operating Temperature Range
• Low Off-State Current
• Precision Reference Voltage: Provides a stable and accurate reference for voltage regulation.

Benefits:

• Flexibility in Design: The programmable output allows for versatile usage in various applications.
• Stable and Accurate Voltage: Provides a reliable voltage reference for precision regulation.
• Cost-Effective Solution: Offers good performance at a competitive price.
• Simple Circuit Integration: Only a few external components needed, simplifying the design process.
• Increased System Reliability: Overvoltage protection features enhance overall system reliability.

Additional Details:

The TL431K-A works by comparing a portion of its output voltage (determined by an external resistor network) with its internal reference voltage. It then adjusts the current it sinks to maintain the output voltage at the desired level. When the output voltage is too low, it sinks more current, increasing the output; when it's too high, it sinks less, decreasing the output.

The TL431K-A is available in packages such as TO-92, SOT-23, and SOIC. Consult the manufacturer's datasheet for precise specifications, including operating conditions, electrical characteristics, and example circuits. The datasheet provides essential information on setting the output voltage, ensuring stability, and dealing with thermal issues.