Str F6267 Datasheet Pdf -

STR F6267 Datasheet PDF: Complete Guide, Pinout, Circuit, and Where to Download

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.

Overview

The STR-F6267 is a specialized hybrid Integrated Circuit (IC) designed by Sanken Electric (now part of Onsemi) for use in Switched-Mode Power Supplies (SMPS). It belongs to the STR-F6200 series, which is widely respected in the consumer electronics industry for high reliability and simplified circuit design. str f6267 datasheet pdf

This component is primarily found in LED televisions, CRT monitors, and industrial power supply units. It functions as a high-voltage power switch and controller, integrating a power MOSFET and a control IC into a single package. STR F6267 Datasheet PDF: Complete Guide, Pinout, Circuit,

Pin Configuration

Understanding the pinout is critical for troubleshooting or replacing this IC. The standard configuration for the 5-pin package is: Pin 1 (Source/O

  1. Pin 1 (Source/O.C.P): MOSFET Source connection; also used for Over-Current Protection sensing.
  2. Pin 2 (Drain): MOSFET Drain connection; connected to the switching transformer primary winding.
  3. Pin 3 (GND): Ground reference for the control circuit.
  4. Pin 4 (Vcc): Supply voltage input for the control logic.
  5. Pin 5 (FB/OVP): Feedback input for regulation and Over-Voltage Protection.

Note: Pin numbering may vary slightly depending on the specific datasheet revision, but standard Sanken pinouts follow this logic.

4. Green & Compliance Features

  • ECOPACK® Compliant: RoHS compliant and halogen-free options available.
  • Low Standby Current: Ultra-low quiescent current in Off-state, preventing battery drain in parked vehicles.

6. Typical Application Circuit (Flyback Topology)

A standard STR-F6267 power supply includes:

  1. AC Input & Rectification: Bridge rectifier and bulk capacitor (150-450V DC).
  2. Transformer (T1): Primary winding between DC bus and Pin 4 (Drain). Auxiliary winding provides feedback voltage to Pin 3 (VCC) via a diode/cap.
  3. Start-up: Internal current source inside Pin 4 charges external capacitor on Pin 3 (VCC) until 16V is reached.
  4. Current Sensing: Resistor from Pin 2 (S/OCP) to GND. ( R_sense = V_th(OCP) / I_peak ).
  5. Feedback Loop: Optocoupler (e.g., PC817) and secondary-side TL431 regulator. Optocoupler transistor pulls current from Pin 1 (FB) to GND to regulate output voltage.
  6. Snubber: RCD snubber across the transformer primary to limit drain voltage spikes.