Current sense input to monitor and limit primary-side current. Connection to the high-voltage internal MOSFET's drain. Practical Applications

Automatically turns off the MOSFET if the junction temperature exceeds approximately 140°C. Standard Application Circuit

In a classic flyback converter design, the STR-F6267 handles the high-voltage switching on the primary side of the circuit.

This IC stands out because it integrates a high-voltage and a current-mode PWM controller into a single, compact package. This integration not only reduces the number of external components required but also streamlines the design process, leading to more reliable and efficient power supplies.

The STR-F6267 is the heart of a Flyback converter. A typical circuit includes: Converts AC to DC (300V-400V). Transformer: Provides isolation and voltage step-down.

A high-value resistor supplies the initial startup current to Pin 4 ( VCCcap V sub cap C cap C end-sub ) from the rectified DC bus.

| Part Number | MOSFET Rating | Frequency | Protection | Direct Replacement? | |-------------|---------------|-----------|--------------------|---------------------------| | STR-F6267 | 650V / 8A | 67 kHz | OLP, OVP, TSD | Reference design | | STR-F6656 | 650V / 6A | 67 kHz | Similar | Lower current – check load | | STR-F6654 | 560V / 4A | 67 kHz | Similar | No (lower voltage) | | TOP258PN | 700V / ext | 66 kHz | Different pinout | No (requires layout change)|

High-performance switching regulator for flyback power supplies

High efficiency in converting AC mains to DC.

: Features a specialized pulse-ratio control during light loads.

Before diving into electrical specs, it is essential to identify the pins. A proper is always included in the STR F6267 datasheet PDF.

Calculating for the startup or snubber network