Reversed a bit the schematic, it's different from all of them.
Here the pinout:
1 Vcc
2 Feedback
3 GND
4 maybe Over Temperature Protection (*)
5 Startup voltage
6 NC
7 Gate Output
8 100R to GND and a capacitor to GND
(*) there is a path to a grey SMD component, with TH2 label, near the switching Mosfet. I measured 560R across it.
It seems there is not a Current Sense function, as the Source is at GND.