onsemi FSFR1700XSL, Resonant Converter Power Switch IC 10-Pin, SIP

Line Level Control (LLC)

Off-Line & Isolated DC-DC Controllers, Fairchild Semiconductor

The Flyback controllers, Line Level Control (LLC) controllers, and Primary-Side Regulation controllers offer Crucial energy savings to address the needs of Switch Mode Power Supply (SMPS) designs.
All controllers come with integrated soft-start, and protection features from over-voltage, open-feedback, overload, output-short, overcurrent, voltage brownout, and Undervoltage-Lockout.