* STR-F6267 is a high-performance off-line switching regulator IC made by Sanken. It is a 5-pin SIP package. Description: The STR- STR-F6267 SANKEN Discrete Semiconductors - Jotrin
You can find the updated PDF datasheets and technical documentation at the following specialized repositories: ALLDATASHEET str f6267 datasheet pdf updated
If the chip won't start, check the startup resistor connected to Pin 4. You should see a rising voltage (typically around 16V–18V) before the chip kicks in. str f6267 datasheet pdf updated