onsemi AC DC Converters, Offline Switches FAN6300DY

The FAN6300DY is a highly integrated quasi-resonant current mode PWM controller designed for use in AC/DC converters, particularly in flyback converter applications. It features a high-voltage startup circuit that reduces startup time and an internal valley voltage detector that enables quasi-resonant operation, minimizing switching losses across a wide range of line voltages and load conditions. This controller includes several protective functions such as cycle-by-cycle current limiting, auto-recovery short-circuit protection, and open-loop protection. The gate output is clamped at 18V to safeguard the power MOSFET from excessive gate-source voltage. Additionally, it incorporates a proprietary green-mode function to enhance efficiency during light-load conditions by modulating off-time and reducing switching frequency. The FAN6300DY operates within a temperature range of -40 to +105¬8C and is available in an 8-lead dual in-line package (DIP). Its design is suitable for applications such as AC/DC notebook adapters and open-frame switch-mode power supplies (SMPS).