The SC9642 is a high-performance, fixed frequency, current mode PWM power switch primarily designed for offline flyback converter applications. Manufactured by Silan, this integrated circuit offers a cost-effective solution for power supplies requiring high efficiency and reliability. It incorporates a variety of protection features to ensure safe operation under various fault conditions.

Applications:

• AC/DC power adapters
• Open-frame power supplies
• Battery chargers
• Standby power supplies
• LED lighting power supplies

Features:

• Built-in high voltage power MOSFET
• Fixed frequency operation for simplified EMI design
• Current mode control for improved line regulation and dynamic response
• Internal slope compensation
• Cycle-by-cycle current limiting
• Overvoltage protection (OVP)
• Overload protection (OLP)
• Overtemperature protection (OTP)
• Short-circuit protection (SCP)

Benefits:

• High efficiency reduces power consumption and heat dissipation
• Simplified design reduces component count and board space
• Enhanced reliability due to integrated protection features
• Improved system stability with current mode control
• Cost-effective solution for power supply applications

The SC9642 operates with a fixed switching frequency, which simplifies the design of EMI filters. The current mode control ensures stable operation and good transient response. The integrated high-voltage power MOSFET reduces the external component count, simplifying the design and reducing the overall cost. Protection features such as overvoltage, overload, and overtemperature protection ensure the device's robustness and reliability. Furthermore, cycle-by-cycle current limiting prevents damage to the MOSFET during overload or short-circuit conditions.

The device is typically available in a DIP-8 package. The startup current is very low which helps improve overall power efficiency. The SC9642 is suitable for a variety of low-power applications requiring a compact and efficient power supply solution.