The SG6848 is a highly integrated PWM controller specifically designed for offline flyback converter applications. It incorporates advanced features for improved performance, efficiency, and protection, making it suitable for a wide range of power supply designs.

Applications:

• AC-DC adapters for laptops and mobile devices.
• Standby power supplies for consumer electronics.
• Auxiliary power supplies in industrial equipment.
• Battery chargers.
• LED lighting power supplies.

Features:

• High-Voltage Startup: Integrated high-voltage startup circuitry enables fast and reliable startup without external components.
• Current-Mode Control: Provides inherent line voltage feed-forward and cycle-by-cycle current limiting.
• Low Standby Power Consumption: Advanced burst-mode operation minimizes power consumption under light load conditions.
• Frequency Jittering: Reduces EMI emissions for improved electromagnetic compatibility.
• Over-Voltage Protection (OVP): Protects the power supply and load from excessive output voltage.
• Over-Current Protection (OCP): Limits the peak current to prevent damage from overload conditions.
• Over-Temperature Protection (OTP): Shuts down the controller if the internal temperature exceeds a safe limit.
• Under-Voltage Lockout (UVLO): Prevents operation with insufficient supply voltage.
• Leading-Edge Blanking (LEB): Minimizes the effect of switching noise on the current sensing signal.

Benefits:

• High Efficiency: Optimized for high efficiency across a wide load range, reducing energy consumption.
• Compact Design: Integration of multiple functions reduces the need for external components, enabling smaller and more cost-effective power supply designs.
• Improved Reliability: Comprehensive protection features ensure robust and reliable operation.
• Reduced EMI: Frequency jittering minimizes EMI emissions, simplifying compliance with regulatory standards.
• Simplified Design: Integrated features and minimal external components simplify the design process.

The SG6848 operates with a typical switching frequency, which can be tailored with external components. It uses a current-mode PWM control scheme to provide excellent line regulation and load regulation performance. The device is typically available in a DIP-8 or SOP-8 package.