Description
SSC1S311A is the controller IC of a quasi-resonant mode for a switching power supplies. The IC incorporates a startup circuit and a standby function to reduce a power consumption and standby power. In normal operation, the quasi-resonant mode operation achieves high efficiency and low noise. In addition, in medium to low load conditions, the operation mode is automatically changes the quasi-resonant mode to the bottom-skip mode to improve efficiency. The IC is provided in the SOIC8 package. The power supply that is a low component counts and a high performance-tocost can be achieved by the rich set of protection features.

FEATUREs
● Multi-Mode Control
   (High efficiency operation in all range of loads)
● Automatic Standby Function
   (Standby power is inproved by burst oscillation mode)
● Input Power at No Load:
   <30mW at 100VAC
   <50mW at 230VAC
● Bottom-Skip Function
   (Switching loss in medium to low loads is reduced)
● Step-on Burst Oscillation Function
   (Transformer audible noises are reduced)
● Bias Assist Function
● Soft-Start Function
● Adjustable Startup Voltage
● Maximum On-time Limitation Function
● VCC Operational Range Expanded
● Leading Edge Blanking (LEB) Function
   (External Filter Components are reduced)
● Protection Functions
   Overcurrent Protection (OCP): Pulse-by-pulse
   Overvoltage Protection (OVP): Auto-restart
   Overload Protection (OLP): Auto-restart
   Thermal Shutdown (TSD): Auto-restart

APPLICATIONs
● Digital Appliance
● Office Automation (OA) Equipment
● White Goods
● Industrial Apparatus
● Communication Facilities