The FSFR1800S is a highly integrated Fairchild Power Switch (FPS) specifically designed for offline power supplies. It incorporates a Pulse Width Modulation (PWM) controller and a SenseFET, minimizing external components and simplifying design. This device offers high efficiency, low standby power consumption, and robust protection features.

Applications

• Power adapters for laptops and mobile devices
• Open-frame SMPS for TVs and monitors
• Auxiliary power supplies
• Industrial power supplies

Features

• Integrated PWM controller and SenseFET: Reduces external components and simplifies design.
• Advanced Burst-Mode operation: Minimizes standby power consumption.
• Built-in soft-start: Reduces stress on components during startup.
• Over-voltage protection (OVP): Protects the power supply from excessive output voltage.
• Over-current protection (OCP): Prevents damage from excessive current flow.
• Over-temperature protection (OTP): Shuts down the device in case of overheating.
• Under-voltage lockout (UVLO): Ensures proper operation during low voltage conditions.
• Frequency hopping: Reduces EMI emissions.

Benefits

• High Efficiency: Minimizes power losses and reduces heat generation.
• Reduced Component Count: Simplifies design and reduces manufacturing costs.
• Improved Reliability: Robust protection features ensure reliable operation.
• Low Standby Power Consumption: Meets energy efficiency requirements.
• Simplified Design: Integrated features simplify the design process.

Additional Details

The FSFR1800S operates with a fixed switching frequency, typically around 100kHz, which allows for optimized performance and reduced EMI. The integrated SenseFET is designed for high voltage operation, ensuring reliable operation in a wide range of input voltage conditions. The device is available in a DIP or SMD package.

The burst mode operation significantly reduces power consumption during light load conditions, making the FSFR1800S ideal for applications requiring compliance with stringent energy efficiency standards such as Energy Star and EuP Lot 6. The internal soft-start circuit limits the inrush current during startup, preventing stress on the power supply components.