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The STR-F6267 datasheet PDF is a comprehensive document that covers the IC's features, pin configuration, electrical characteristics, and application notes. The datasheet is well-organized, and the information is easy to find.
Source terminal of the internal Power MOSFET, typically clamped to common ground. VCC
– The control circuitry reference ground pin.
| Pin Number | Pin Name | Function Description | | :--------- | :------------- | :----------------------------------------------------------------------------------------------------------------------------------- | | 1 | | Ground Pin. The reference ground for the IC's control circuit. It must be connected to the primary-side ground in the PSU. | | 2 | Vcc | Power Supply Pin. Supplies the operating voltage to the internal controller (typically around 15-18V). This voltage is usually derived from an auxiliary winding on the transformer. | | 3 | FB | Feedback Pin. Receives the feedback signal from the secondary side (usually via an optocoupler) to regulate the output voltage. | | 4 | CS | Current Sense Pin. Monitors the primary current via an external sense resistor to detect overcurrent conditions and for cycle-by-cycle current limiting. | | 5 (or 8)* | DRAIN | Power Switching Pin. The drain terminal of the internal high-voltage power MOSFET. It is connected to the primary winding of the flyback transformer. | | 6 | SYNC | Synchronization Input Pin. Allows the switching frequency to be synchronized with an external clock for system-level timing coordination. May not be present on all variants (check datasheet). | | 7 | CT | Soft Start Time Setting Pin. An external capacitor connected to this pin sets the soft-start duration. | | 8 | DTC | Duty Taper Control Pin. Used to control the maximum duty cycle of the PWM output. |
Many online "datasheets" are incomplete or from third-party repair sites. Look for the Sanken logo and a document number starting with DS-F6267 . str f6267 datasheet pdf
Servicing a power supply built around the STR-F6267 requires a systematic approach. Below are common failure scenarios and diagnostic steps:
: Instantly limits the MOSFET's peak current if an overload occurs on the secondary rails, preventing catastrophic component degradation.
This IC is frequently used in power supplies for consumer electronics, including:
– The input supply power pin for the internal control logic and driver circuits. It sustains the IC's operation once the system passes the initial startup phase. The STR-F6267 datasheet PDF is a comprehensive document
: Slightly shifts the switching frequency dynamically to spread electromagnetic interference (EMI) energy across a broader spectrum, significantly reducing peak noise profiles.
Overcurrent Protection and Feedback loop monitoring terminal. Source
The STR-F6267 is a highly integrated PMIC that features:
Frequently found in the power supply stage of CRT and modern display units. VCC – The control circuitry reference ground pin
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OVP and TSD are latched . The supply will not restart until you unplug AC power for several seconds. OCP is auto-recovery.
Includes built-in overcurrent protection (OCP), overvoltage protection (OVP), and thermal shutdown (TSD). Soft Start:
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