If you’re designing a power supply for a high-efficiency offline flyback converter, you have likely encountered the STR-F6267—a highly integrated power IC from Sanken. This component is a cornerstone in many consumer electronics, including LCD TVs, DVD players, printers, and industrial standby power supplies. This article serves as a comprehensive resource for understanding the STR F6267 datasheet PDF, including its technical specifications, internal block diagram, application circuit, and where to download the official document.
Because the keyword "STR F6267 datasheet PDF" is highly specific, ensure you source the document from legitimate manufacturers or distributors:
Note: Always check the revision number. The latest revision (as of 2025) is STR-F6267-DS-Rev.3.0. Earlier revisions may have different OLP timer settings.
When viewing the printed side (face) of the IC, pins are numbered from left to right.
| Pin | Name | Function Description | | :--- | :--- | :--- | | 1 | FB (Feedback) | Receives feedback current from the optocoupler. Controls duty cycle. | | 2 | S/OCP (Source) | Source pin for the internal MOSFET. Also senses current via an external resistor for overcurrent protection. | | 3 | VCC (Supply) | Power supply input for the control IC (typically 18V to 22V operating). | | 4 | D (Drain) | Drain pin of the built-in high-voltage MOSFET. Connects to the primary transformer winding. | | 5 | GND | Ground pin for the control circuit. (Note: Isolated from the MOSFET source internally). |
The STR F6267 datasheet PDF is more than just a pinout diagram—it is an engineering toolkit that includes all necessary specifications for designing robust, high-efficiency flyback power supplies. By understanding the absolute maximum ratings, protection features, and typical application circuit, you can confidently integrate this IC into your next AC-DC converter project.
Always download the latest revision of the datasheet from an authorized source, and cross-reference the date code to ensure you are not working with an obsolete or preliminary version. With the right design practices derived from the STR F6267 datasheet PDF, you can achieve cost-effective, reliable power conversion in the 60W–100W range.
Need to troubleshoot a specific circuit? The STR F6267 datasheet PDF includes detailed waveforms and design equations. Keep a copy saved locally for quick reference during PCB debugging. str f6267 datasheet pdf
Sanken STR-F6267 is an integrated circuit (IC) designed specifically for off-line quasi-resonant flyback switching regulators
. It combines a high-voltage power MOSFET and a controller in a single package to provide stable and efficient power regulation for applications like TVs and VCRs. Key Features & Functionality Quasi-Resonant Topology
: Operates as a quasi-resonant flyback converter, which helps achieve high efficiency (up to 95%) and significantly lower EMI noise compared to standard PWM solutions. Integrated Power MOSFET
: Includes a built-in power MOSFET and a current-mode controller in one 5-pin package, reducing external component count. Advanced Control
: Features a frequency jittering circuit to further minimize EMI and a feedback mechanism for precise voltage regulation. Soft Start Functionality
: Ensures a gradual and controlled power-up sequence to prevent excessive stress on components during start-up. Built-in Protections Over-Current Protection (OCP)
: Uses cycle-by-cycle current limiting to protect against output overloads. Thermal Shutdown (TSD) STR F6267 Datasheet PDF: Complete Guide to Pinouts,
: Automatically shuts down the IC if internal temperatures exceed safe operating limits. Under-Voltage Lock-Out (UVLO)
: Prevents the IC from operating at insufficient supply voltages, ensuring reliable startup and shutdown cycles. Technical Specifications Description Manufacturer Sanken Electric Package Type 5-pin SIP / TO-3P Primary Application Off-line SMPS (Switching Mode Power Supplies) Core Functions Switching regulator, current mode controller Efficiency Common Applications Color TV and VCR power supplies. AC/DC adapters and battery chargers. LED and motor drivers. Alltronic Computer Singapore For a full technical analysis, you can view the STR-F6267 Datasheet AllDatasheet Jotrin Electronics or a specific pinout diagram for this IC?
STR-F6267 SANKEN Discrete Semiconductors - Jotrin Electronics
The STR-F6267 is a high-performance, off-line switching regulator IC developed by Sanken Electric. It is specifically designed for use in Quasi-Resonant Flyback switching power supplies (SMPS) to provide high efficiency and low electromagnetic interference (EMI). 1. Key Features and Functional Overview
The IC integrates a high-voltage power MOSFET and a controller chip into a single TO-3PF-5 (5-pin SIP) package. This integration reduces the total component count for power supply designs. High Efficiency: Capable of achieving up to 95% efficiency.
Low EMI: Utilizes quasi-resonant operation and frequency jittering to minimize noise.
Protection Suites: Built-in safeguards include thermal shutdown, overcurrent protection, and soft start functionality. Isolation: Pin 5 (GND) and Pin 2 (S/OCP)
Standby Performance: Features a "burst-oscillation" mode to lower power consumption under light load or standby conditions. 2. Pin Configuration (TO-3PF-5)
While specific pinouts can vary slightly by application, the standard configuration for the STR-F626x series typically follows this sequence:
Pin 1 (Drain): Connected to the internal power MOSFET drain. Pin 2 (Source): Ground reference for the MOSFET. Pin 3 (VCC): Control circuit power supply input. Pin 4 (Feedback): Used for output voltage regulation.
Pin 5 (Overcurrent Protection/Sync): Used for external synchronization or sensing current. 3. Technical Specifications Standard Value/Range Package Type TO-3PF-5 (5-pin) Max Operating Temp Up to 105°C Switching Type Quasi-Resonant Flyback Primary Use Off-line SMPS, AC/DC Adapters 4. Typical Applications
The STR-F6267 is a versatile regulator used across consumer and industrial electronics:
Consumer Electronics: Television sets, LED drivers, and battery chargers.
Power Conversion: AC/DC adapters and switching power supplies for office automation.
Industrial Equipment: High-power RF amplifiers, oscillator circuits, and motor control. 5. Purchasing and Datasheet Access STR-F6267 - SANKEN - Jotrin Electronics
(Note: If "str f6267" refers to a specific legacy audio component or a less common variant, the pinout may differ, but the STF6267 is the primary active component matching this part number).