The UVLO circuit ensures that the IC does not attempt to switch the MOSFET until the VCCcap V sub cap C cap C end-sub
The of the device you are repairing (e.g., TV, monitor model).
A typical application circuit diagram, available in the official datasheet, will show the STR-F6267 connected to a flyback transformer, an optocoupler for feedback, and a few passive components like resistors and capacitors. The circuit usually includes an AC input rectifier, a bulk capacitor, and the output rectification stage. The IC's internal oscillator and control logic manage the switching of the MOSFET to regulate the output voltage based on the feedback signal.
Source terminal of the internal MOSFET. Connected to the primary ground via a current-sensing resistor. Ground terminal for the internal control circuitry. Pin 4
Regulates and controls off-line switching power supplies (SMPS) to provide stable and efficient DC power. Efficiency: Capable of reaching up to 95% efficiency through its quasi-resonant switching mode. Thermal Tolerance:
Disclaimer: The values in this report are typical from historical datasheets (circa 2005-2015). Always consult the latest official Sanken datasheet for your specific revision before designing or repairing any power supply.
Key functional blocks and pins (typical for STR‑F6xx family)
Built-in safeguards include thermal shutdown, overcurrent protection, and soft start functionality.
Check the startup resistor connected to Pin 4. If it opens, the IC cannot boot. Also, check for a short circuit between Pin 1 (Drain) and Pin 2 (Source).
AC-DC adapters for monitors, TVs, and audio equipment.
: Power supplies for domestic appliances, LED drivers, and open-frame industrial modules. Procurement and Counterfeit Risks
Minimizes component stress during power-up sequence. 2. Pin Configuration and Functions
In a classic flyback converter design, the STR-F6267 handles the high-voltage switching on the primary side of the circuit.