Automatically switches to a power-saving standby mode during low-load conditions.

: Drain/Startup terminal for the MOSFET and startup signal input. Pin 2 (S/OCP) : Source/Overcurrent Protection terminal. Pin 3 (GND) : Ground terminal. Pin 4 (VCC) : Power supply terminal for the control circuit.

An optocoupler (e.g., PC817) paired with a shunt regulator (e.g., TL431) on the secondary side is used to provide galvanic isolation while routing error signals back to Pin 5 (FB) for tight voltage regulation. 6. Troubleshooting and Common Fail Modes

The is a high-performance, off-line switching regulator IC developed by Sanken Electric . Designed specifically for Switched Mode Power Supplies (SMPS), it integrates a power MOSFET and a current-mode PWM controller into a single, compact 5-pin package. Key Technical Specifications

Detects internal chip temperature. If the junction temperature crosses approximately 150°C, the drive circuit turns off the power MOSFET to prevent thermal runaway. 5. Typical Application Circuit Design

Capable of achieving efficiency rates up to 95% , minimizing power loss and improving thermal performance.

Capable of achieving efficiency levels up to 95%.

Houses a high-voltage, fast-switching power transistor (or avalanche-rated power MOSFET variant) optimized for primary converter loops.

The STR-F6267 simplifies circuit design by combining a and a current mode PWM controller into a single package. This integration reduces the overall component count on the PCB, which in turn lowers manufacturing costs and saves board space. Key technical features include:

Found in some small-scale motor drivers and battery chargers.