The KA3882C is a fixed frequency current-mode PWM controller from Fairchild Semiconductor (now ON Semiconductor). It is specifically designed for offline and DC-to-DC converter applications. This controller offers a highly integrated solution with features such as undervoltage lockout, overcurrent protection, and soft start, providing a reliable and efficient power conversion solution.

Applications

• Offline Power Supplies: Used in AC-DC power supplies for consumer electronics and industrial equipment.
• DC-DC Converters: Employed in various DC-DC conversion applications, such as battery chargers and voltage regulators.
• Adapter Power Supplies: Integrated into power adapters for laptops, mobile phones, and other portable devices.
• Battery Chargers: Used in battery charging circuits for various battery types.
• Auxiliary Power Supplies: Implemented in auxiliary power supplies for industrial and automotive applications.

Features

• Fixed Frequency Operation: Provides stable and predictable switching frequency.
• Current-Mode Control: Offers excellent line regulation and load regulation.
• Undervoltage Lockout (UVLO): Prevents operation with insufficient supply voltage.
• Overcurrent Protection (OCP): Protects the power supply from excessive current.
• Soft Start: Reduces stress on components during startup.

Benefits

• Stable Operation: Fixed frequency operation ensures consistent performance.
• High Efficiency: Current-mode control enables efficient power conversion.
• Reliable Protection: Built-in protection features enhance system reliability.
• Simplified Design: Integrated functionality simplifies the design process and reduces component count.
• Reduced EMI: Soft start feature minimizes electromagnetic interference.

Additional Details

The KA3882C typically operates at a fixed switching frequency of 100 kHz and is available in an 8-pin DIP or SOIC package. Key specifications include a supply voltage range of 10V to 30V and a peak current limit of 1A. It is crucial to consult the datasheet for specific operating conditions, component selection guidelines, and application notes to ensure proper and safe operation. The device is commonly used in cost-sensitive power supply applications where efficiency and reliability are important considerations.