— The drain terminal of the internal high-voltage switching power MOSFET. This pin connects directly to the primary winding of the SMPS flyback transformer.
– Receives the constant-voltage control loop signal. This is usually driven via an optocoupler from the secondary side to keep output voltages strictly regulated. Key Features Highlighted in the Datasheet 1. Integrated Power MOSFET
Power supply pin for the internal control logic and gate drive circuit. Feedback (FB) / OCP str f6267 datasheet pdf
You can find the full PDF documentation on major electronic component databases: Alldatasheet - STR-F6267 Datasheet Archive - STR F 6267 Search Utsource - Technical Specs
If the power supply continually starts up and shuts down, check for a short circuit on the secondary output diodes or a faulty optocoupler loop feeding Pin 5. — The drain terminal of the internal high-voltage
STR-F6267 SANKEN Discrete Semiconductors - Jotrin Electronics
: Available in 5-pin SIP (Single In-line Package) or ZIP packages, often identified in TO-3P style moldings. This is usually driven via an optocoupler from
Receives feedback signal from the secondary side for regulation; also serves as the overcurrent protection sense input. 3. Absolute Maximum Ratings
Combines the high-voltage switching transistor and control circuitry to reduce external component count.
This is the most common failure mode. A catastrophic voltage spike or thermal overload can puncture the internal MOSFET. Check resistance between Pin 1 and Pin 2; a reading near 0 Ohms indicates a dead IC. Always check the primary snubber components and the source resistor ( Rsensecap R sub s e n s e end-sub ) when replacing the IC.
This pin configuration is standard for ICs in the STR-F6200 series, making it relatively straightforward to design with and troubleshoot.