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