Receives feedback signal from the secondary side for regulation; also serves as the overcurrent protection sense input. 3. Absolute Maximum Ratings
| Symptom | Likely cause per datasheet | Solution | |------------------------------|-----------------------------------------------------|--------------------------------------------| | No startup, VCC oscillates | VCC startup capacitor too small or leakage | Increase to 47µF, check startup resistor | | Supply shuts down under load | Current sense resistor too large (false OCP) | Reduce resistor value (e.g., 0.33Ω→0.27Ω) | | Blown IC | Drain overvoltage spike exceeding 650V | Improve snubber, check transformer leakage | | Intermittent restart | Overload protection triggered by noise on FB pin | Add 100pF capacitor from FB to GND |
. It is primarily used as the primary-side controller in Switched-Mode Power Supplies (SMPS), integrating both a power MOSFET and a control circuit into a single 5-pin SIP or TO-3P package Core Technical Specifications Device Type: SMPS Primary IC / Quasi-Resonant Flyback Regulator Efficiency: Can achieve up to 95% efficiency Integrated Components: str f6267 datasheet pdf
The STR-F6267 integrates a primary control and drive circuit with a robust, avalanche-guaranteed power MOSFET on a single silicon substrate. Packaged in a standard , it significantly reduces external component count, minimizes printed circuit board (PCB) footprint, and enhances overall system reliability.
: Instantly limits the MOSFET's peak current if an overload occurs on the secondary rails, preventing catastrophic component degradation. Receives feedback signal from the secondary side for
A: Yes, the “S” suffix may indicate improved ESD rating or different package material. Refer to the specific datasheet.
Sanken STR-F6267 is an integrated circuit (IC) designed specifically for off-line quasi-resonant flyback switching regulators It is primarily used as the primary-side controller
The device uses a modified 5-pin configuration (typically found in a TO-3P or custom ZIP package format). Correctly mapping these pins prevents destructive failure when measuring live voltages or replacing an old IC.
When you open the , pay special attention to these sections:
Based on information compiled from various sources and the official datasheet, the key technical specifications of the STR-F6267 are as follows: