The AZ431BN-BTR is a precision adjustable shunt regulator manufactured by BCD Semiconductor Manufacturing Limited. It serves as a versatile and reliable component in circuits needing stable and adjustable voltage regulation. Its key features allow for integration into a wide array of electronic applications.

Applications

• Linear Power Supplies: Provides adjustable and stable voltage regulation.
• Switching Power Supplies: Used in feedback loops for precise output voltage control.
• Voltage Monitoring Circuits: Implements voltage detection for over-voltage and under-voltage protection.
• Battery Chargers: Regulates charging voltage for various battery types.
• Instrumentation: Used in precision measurement equipment where a stable voltage reference is crucial.

Features

• Adjustable Output Voltage: Can be programmed to any voltage between Vref (typically 2.5V) and its maximum operating voltage (typically 36V) using external resistors.
• Low Dynamic Output Impedance: Ensures stability and minimizes voltage variations under different load conditions.
• Wide Operating Current Range: Operates effectively with sink currents ranging from a few milliamperes to tens of milliamperes.
• High Precision Reference Voltage: Offers a precise internal reference voltage, ensuring accuracy in voltage regulation.
• Low Temperature Coefficient: Maintains stable performance across a wide range of operating temperatures.
• Short Circuit Protection: Some versions include short circuit protection to enhance reliability.

Benefits

• High Accuracy Voltage Regulation: Provides precise voltage regulation, ensuring stable and reliable performance of connected circuits.
• Flexibility in Design: Adjustable output voltage allows it to be tailored to specific application requirements.
• Robust Performance: Low dynamic output impedance contributes to stable operation even under varying load conditions.
• Cost-Effective: Offers an economical solution for precision voltage regulation.
• Versatile Application: Suitable for a wide variety of applications, from power supplies to battery chargers and instrumentation.

Additional Details

The AZ431BN-BTR functions as a shunt regulator, meaning it regulates voltage by shunting excess current to ground. It operates by comparing a fraction of the output voltage (determined by external resistors) to its internal reference voltage. The output transistor then adjusts its conduction to maintain the desired output voltage. The output voltage is set using the formula: Vout = Vref * (1 + R1/R2), where Vref is the reference voltage, and R1 and R2 are the external resistors.

Common package types include TO-92, SOT-23, and SOIC. Designers should consult the datasheet for detailed electrical characteristics, thermal performance, and application guidelines.