Pdf Updated: Str F6267 Datasheet
| Pin Number | Name/Function | Description | | :--- | :--- | :--- | | | GND / Source | Ground reference for the control circuit and the source connection of the internal power MOSFET. | | 2 | VCC | Power supply pin for the IC. Provides operating voltage for the internal control logic. Requires a stabilizing capacitor. | | 3 | FB / Feedback | Feedback input pin. Connects to the secondary side via an optocoupler to regulate the output voltage. | | 4 | CS / Current Sense | Current Sense pin. Monitors the primary current via an external sense resistor. Used for overcurrent protection and feedback control. | | 5 | DRAIN | Drain pin of the internal high-voltage MOSFET. Connects to the primary side of the switching transformer. |
Just to confirm you are looking at the right part—this IC is typically found in:
Many repair technicians have been using the wrong value for the Vcc capacitor. The new datasheet clarifies the required Start-up current supply (max 100µA) and the recommended Vcc capacitance (47µF–100µF) to prevent "hiccup mode" during power-on. str f6267 datasheet pdf updated
| Parameter | Condition | Min | Typ | Max | Unit | |-------------------------------|----------------------------|-----|-----|-----|------| | Startup current | VCC = Vth(start) – 0.5V | - | 10 | 20 | µA | | Operating current (normal) | FB open, VCC = 18V | - | 3.0 | 5.0 | mA | | Operating current (burst) | Light load | - | 0.9 | - | mA | | VCC startup threshold | VCC rising | 14.5| 16.0| 17.5| V | | VCC under‑voltage lockout | VCC falling | 8.0 | 9.0 | 10.5| V | | VCC overvoltage protection | VCC rising | 26 | 27.5| 29 | V | | Maximum duty cycle | - | 72 | 76 | 80 | % | | Oscillator frequency | - | 60 | 67 | 74 | kHz | | Sense voltage limit (OCP) | Pulse‑by‑pulse | 0.75| 0.80| 0.85| V | | FB terminal open voltage | - | - | 5.5 | - | V | | Thermal shutdown | Tjunction rising | - | 140 | - | °C |
Optimized internal circuitry supports low power consumption under light-load conditions, making it compliant with global standby power regulations. | Pin Number | Name/Function | Description |
The STR-F6267 is a hybrid integrated circuit (IC) designed specifically for flyback switching regulator power supplies. Manufactured by Sanken Electric Co., Ltd., this component is widely utilized in consumer electronics like television sets, monitors, and industrial power equipment due to its high efficiency and robust protection features.
Share your experience with the STR-F series in the comments below! STR-F6267 - SANKEN - Jotrin Electronics Requires a stabilizing capacitor
Pay attention to Figure 6: "Quasi-Resonant Operation." The updated datasheet adds notes on valley switching, which reduces turn-on loss. The IC detects voltage dips on the Drain after demagnetization.
If the chip won't start, check the startup resistor connected to Pin 4. You should see a rising voltage (typically around 16V–18V) before the chip kicks in.