Often caused by degraded electrolytic capacitors on the VCCcap V sub cap C cap C end-sub line (Pin 4) or a faulty optocoupler loop feeding Pin 5.
The standard version of the STR-F6267 focuses on a compact 5-pin layout to maximize structural separation between low-power signals and high-voltage rails. Pin Number Core Functional Purpose GND / Common Primary circuit common ground reference. 2 VCC Power supply input terminal for the internal controller. 3 FB (Feedback) Error amplifier signal input to monitor output regulation. 4 CS (Current Sense) Overcurrent monitoring via external sense resistor. 5 DRAIN High-voltage internal power switching MOSFET connection. Key Technical Features str f6267 datasheet pdf upd
The is a highly efficient, off-line switching regulator integrated circuit (IC) manufactured by Sanken Electric , designed specifically for Switch-Mode Power Supplies (SMPS) and quasi-resonant flyback converters. This component integrates a primary control and drive circuit alongside a power MOSFET into a single package, drastically reducing component count and saving valuable PCB space. Technical details, pinout configurations, and full performance parameters are available in the updated STR-F6267 Datasheet PDF on Alldatasheet . Core Specifications and Features Often caused by degraded electrolytic capacitors on the