The CL431 is a precision adjustable shunt regulator manufactured by Calogic, LLC. It functions as a programmable zener diode, offering a versatile and cost-effective solution for voltage regulation in a variety of electronic circuits. By using external resistors, the output voltage can be adjusted to any desired value within the device's operating range. This makes it suitable for applications requiring precise and stable voltage references or error amplifiers.

Applications

• Switching Power Supplies
• Voltage References
• Linear Regulators
• Error Amplifiers
• Overvoltage Protection

Features

• Adjustable Output Voltage: Can be set to any voltage between Vref (typically 2.5V) and 36V.
• Low Output Noise: Provides a clean and stable output voltage.
• Low Dynamic Output Impedance: Ensures stable operation with varying load currents.
• Sink Current Capability: Can sink current from 1mA to 100mA.
• Temperature Stability: Maintains stable performance over a wide temperature range.
• Available Packages: TO-92, SOT-23, SOIC-8

Benefits

• Precision Voltage Regulation: Provides accurate and stable voltage control.
• Flexibility: Adjustable output voltage allows for use in a wide range of applications.
• Cost-Effective: Offers a low-cost alternative to fixed voltage regulators.
• Simplified Circuit Design: Reduces the number of components required in voltage regulation circuits.
• Reliable Performance: Ensures stable operation under varying conditions.

Additional Details

The CL431 operates by comparing a fraction of its output voltage to an internal reference voltage (Vref). The output voltage is adjusted by selecting appropriate resistor values connected between the output, the reference pin, and ground. The device maintains a constant output voltage by adjusting its internal current to compensate for changes in input voltage or load current. Proper selection of external components is crucial for optimizing stability and transient response. Different package options provide flexibility in PCB design and mounting. It is essential to consult the datasheet for specific operating conditions and application guidelines. The CL431 is commonly used in power supplies to regulate output voltage, in voltage references to provide a stable reference for other circuits, and in error amplifiers to improve the accuracy of control systems.