Power IC for Quasi-Resonant Type Switching Power Supply with High Efficiency and Low Noise in Full Load Range
 

General Descriptions
The STR-W6700 series products are power  ICs for quasi-resonant type switching power supplies, incorporating a power MOSFET and a controller IC, The product achieves high efficiency and low noise power supply systems by the quasi-resonant operation and the  bottom-skip quasi-resonant operation. 

The STR-X6700 series products are the different package (TO-3PF) versions.