The SSL2101 is a Switched Mode Power Supply (SMPS) controller IC that operates in combination with a phase cut dimmer directly from rectified mains. It is designed to drive LED devices..
SSL2101 SMPS Controller - NXP Semiconductors
SSL2101 12W-230V Triac dimmable fly-back demonstration board UM10341
The SSL2101 driver is a solution for a professional application with multiple high power LEDs that require galvanic isolation and a safe output voltage. It is mains dimmable for both forward phase (triac) dimmers, and reverse phase (transistor) dimmers.
It can generate up to 16 W output power, which is equal to a 100 W incandescent lamp (at 63 Lumen/W). Examples are shelf lighting, down lighting and LED lighting for bathrooms etc. The design demonstrates how to produce a driver that is suitable for small form factor applications such as retrofit lamps.