The LR431ATSLT1G is a precision adjustable shunt regulator manufactured by Leshan Radio, a Chinese manufacturer of semiconductor devices. This regulator is designed to provide a stable and precise reference voltage for a wide range of applications, including power supplies, voltage monitors, and error amplifiers. Its adjustable output voltage and low temperature coefficient make it a versatile component for demanding circuit designs.

Applications:

• Power Supplies: Used as a voltage reference in linear regulators and switching power supplies.
• Voltage Monitors: Employed in over-voltage and under-voltage detection circuits.
• Error Amplifiers: Utilized in feedback control systems for precise voltage regulation.
• Comparators: Incorporated into comparator circuits for threshold detection.
• Instrumentation: Applied in precision measurement equipment for accurate voltage referencing.

Features:

• Adjustable Output Voltage: Allows for precise voltage setting using external resistors.
• Low Temperature Coefficient: Provides stable voltage regulation over a wide temperature range.
• Low Output Noise: Minimizes noise in the regulated voltage output.
• High Precision: Offers accurate voltage regulation with tight tolerance.
• Low Minimum Cathode Current: Operates with low current consumption.
• TO-92 Package: Small and widely used through-hole package.

Benefits:

• Precise Voltage Regulation: Provides a stable and accurate voltage reference.
• Versatile Application: Suitable for a wide range of voltage regulation and monitoring applications.
• Improved Stability: Ensures consistent performance over varying temperatures.
• Reduced Noise: Minimizes noise-related issues in sensitive circuits.
• Cost-Effective Solution: Offers a high-performance voltage reference at a competitive price.

Additional Details:

The LR431ATSLT1G operates based on the principle of a shunt regulator, where the output voltage is determined by external resistors connected to the adjust pin. This allows for precise setting of the output voltage according to the application requirements. The regulator's low temperature coefficient ensures minimal drift in the output voltage over temperature variations. Its low output noise characteristic makes it suitable for sensitive analog circuits.

The typical output voltage range is from Vref (approximately 2.5V) to 36V, with the output voltage being calculated based on the external resistor values. The datasheet provides detailed information on selecting appropriate resistor values and performance characteristics. Leshan Radio offers comprehensive technical documentation and support to assist designers in integrating the LR431ATSLT1G into their circuits. The TO-92 package makes it easy to prototype and integrate into through-hole PCB designs.