The SC7313, manufactured by Silan, is a highly integrated offline power switch designed for low power AC/DC adapter and charger applications. It integrates a power MOSFET and a control circuit, optimizing performance, cost, and size. It’s designed to provide a simplified and efficient solution for converting AC voltage to DC voltage with minimal external components. The precise current sensing and control allows for high precision constant voltage (CV) and constant current (CC) output.

Applications

• Mobile phone chargers
• Tablet chargers
• Small power adapters
• LED lighting
• Standby power supplies

Features

• Integrated Power MOSFET: Simplifies the design and reduces the BOM count.
• High Precision Constant Voltage and Constant Current (CV/CC) Control: Provides accurate output voltage and current regulation.
• Primary-Side Regulation (PSR): Eliminates the need for secondary feedback components.
• Low Standby Power Consumption: Improves overall energy efficiency.
• Over-Voltage Protection (OVP): Protects the device from damage due to excessive output voltage.
• Over-Current Protection (OCP): Limits the output current to prevent damage from overload.
• Short Circuit Protection (SCP): Protects against short-circuit conditions.
• Over-Temperature Protection (OTP): Protects the device from overheating.
• Frequency Jittering: Improves EMI performance.
• Soft Start: Reduces stress on the power MOSFET during startup.

Benefits

• Simplified Design: Reduces the number of external components required.
• High Efficiency: Achieves high efficiency across a wide load range.
• Cost-Effective: Integrated features lower the overall system cost.
• Reliable Operation: Comprehensive protection features enhance system reliability.
• Compact Size: Allows for smaller and more compact adapter designs.
• Accurate Output Regulation: Provides stable and precise output voltage and current.

Additional Details

The SC7313 employs a primary-side regulation (PSR) control strategy, which eliminates the need for an optocoupler and secondary feedback components. This simplifies the design, reduces the BOM cost, and improves the overall efficiency. The built-in frequency jittering function helps to reduce EMI, simplifying the design process and helping to meet regulatory requirements.

The device incorporates comprehensive protection features, including over-voltage protection (OVP), over-current protection (OCP), short-circuit protection (SCP), and over-temperature protection (OTP). These features protect the device from damage under various fault conditions, ensuring reliable operation. The soft start function reduces the stress on the power MOSFET during startup, improving system reliability.

The SC7313 is available in a compact package, making it suitable for space-constrained applications. It is designed to meet stringent energy efficiency standards, enabling the development of energy-efficient chargers and adapters.

For detailed technical specifications, refer to the Silan datasheet for the SC7313. The datasheet contains detailed information on electrical characteristics, thermal characteristics, and application circuit diagrams.