The AP431IRA is a precision adjustable shunt regulator manufactured by Anachip Corp. It is a three-terminal adjustable shunt regulator offering excellent temperature stability and output accuracy, making it suitable for various voltage regulation applications.

Applications

• Power Supplies: Used in linear and switching power supplies for voltage regulation.
• Chargers: Implemented in battery chargers to maintain a stable charging voltage.
• Instrumentation: Utilized in precision instruments for accurate voltage references.
• Voltage Monitoring: Employed in voltage monitoring circuits to detect over-voltage or under-voltage conditions.
• Error Amplifiers: Functions as an error amplifier in feedback control systems.

Features

• Adjustable Output Voltage: Output voltage can be set to any value between Vref (typically 2.5V) and 36V with two external resistors.
• Low Temperature Coefficient: Ensures stable operation over a wide temperature range.
• High Precision: Offers tight output voltage tolerance.
• Low Output Noise: Minimizes noise in the output voltage, suitable for sensitive applications.
• Sink Current Capability: Capable of sinking current from 1mA to 100mA.
• Low Dynamic Output Impedance: Provides stable output voltage under varying load conditions.

Benefits

• Precision Voltage Regulation: Delivers highly accurate and stable voltage regulation for critical applications.
• Versatile Application: Suitable for a wide range of voltage regulation and control applications due to its adjustable output.
• Stable Performance: Maintains consistent performance across a broad temperature range, ensuring reliability.
• Cost-Effective: Provides a cost-efficient solution for precision voltage regulation compared to more complex alternatives.
• Simplified Design: Requires only a few external components, simplifying circuit design and reducing BOM cost.

Technical Specifications

The AP431IRA operates with a reference voltage (Vref) typically around 2.5V. The operating temperature range generally spans from -40°C to +85°C. The device is usually available in packages such as TO-92, SOT-23, and SOIC. The output voltage is determined by the formula: Vout = Vref * (1 + R1/R2), where R1 and R2 are external resistors. It features a typical dynamic output impedance of around 0.2 ohms, ensuring stable output under varying load conditions. The device is designed to handle sink currents from 1mA to 100mA.