The SSC2059Y, manufactured by AUK Corp, is a highly integrated current-mode PWM controller specifically designed for offline flyback converter applications. This IC offers a cost-effective solution with comprehensive protection features, making it ideal for various power supply applications requiring high efficiency and reliability.

Applications

• AC/DC adapters for mobile devices and consumer electronics
• LED lighting power supplies
• Standby power supplies for various appliances
• Battery chargers
• Auxiliary power supplies in industrial equipment

Features

• Current-Mode PWM Control: Provides inherent line voltage feed-forward for improved stability and transient response.
• Low Startup Current: Minimizes power consumption during startup, contributing to higher overall efficiency.
• Built-in Leading Edge Blanking (LEB): Suppresses the initial current spike caused by diode reverse recovery, enhancing noise immunity.
• Cycle-by-Cycle Current Limiting: Protects the power supply from over-current conditions on a cycle-by-cycle basis.
• Over-Voltage Protection (OVP): Prevents damage to the load due to excessive output voltage.
• Over-Temperature Protection (OTP): Shuts down the controller if the internal temperature exceeds a safe limit.
• Under-Voltage Lockout (UVLO): Ensures proper operation during voltage fluctuations and prevents erratic switching.
• Frequency Foldback at Light Load: Improves efficiency at light loads by reducing the switching frequency.

Benefits

• High Efficiency: The combination of current-mode control and frequency foldback results in high efficiency across a wide load range.
• Robust Protection: Comprehensive protection features safeguard the power supply and the connected load from various fault conditions.
• Simplified Design: Integration of key functions reduces the number of external components required, simplifying the design process.
• Cost-Effective Solution: Provides a cost-competitive solution for power supply applications.
• Improved Reliability: The built-in protection features contribute to enhanced reliability and longer lifespan.

Additional Details

The SSC2059Y operates with an external MOSFET and a flyback transformer. The switching frequency is typically fixed but can be adjusted using external components. The device also features a soft-start function to minimize stress on components during startup. AUK Corp provides detailed application notes and design guidelines to facilitate the design of power supplies using the SSC2059Y.