The KA431ZBU is a precision adjustable shunt regulator manufactured by Fairchild/ON Semiconductor. This three-terminal device functions similarly to a Zener diode but offers greater precision and adjustability. It is commonly used in voltage regulation and error amplifier applications.

Applications

• Adjustable voltage regulators.
• Shunt regulators.
• Voltage references.
• Error amplifiers.
• Switching power supplies.

Features

• Programmable output voltage.
• Low dynamic output impedance.
• Sink current capability from 1mA to 100mA.
• Equivalent full-range temperature coefficient typically 50 ppm/°C.
• Low output noise voltage.

Benefits

• Precise voltage regulation: Offers accurate and stable voltage regulation in various applications.
• Adjustable output: Allows for flexible voltage setting to meet specific design requirements.
• Low output impedance: Provides stable output voltage even with varying load currents.
• Versatile: Suitable for a wide range of voltage regulation and reference applications.

Additional Details

The KA431ZBU is available in various package types, typically a TO-92 or similar. The output voltage is programmed using two external resistors, allowing for precise adjustment. The device requires a minimum cathode current to operate correctly. It's essential to consult the datasheet for the recommended operating conditions and component values. This device is commonly used in feedback loops to control the output voltage of power supplies. The internal reference voltage is typically around 2.5V, and the output voltage can be adjusted above this value. The datasheet specifies the allowable range and resistor selection process. Proper bypassing is often used to minimize noise and ensure stable operation.