What is this 9609SB?
Check this out pin out. Looks similar to the part reference in the question.

This application circuit has similar components per the question. Example Pin 4 SW is connected to diode.

Here is link to the datasheet.
https://www.neumueller.com/datenblatt/macroblock/MBI6655%20Datenblatt%20-%20Datasheet.pdf
Additionally MB10 looks like a bridge rectifier. These should help identify the components.