A typical fast charging system mainly consists of a high-efficiency AC-DC converter and a precise voltage regulation circuit. At its core is a high-frequency switching power supply, which usually adopts a quasi-resonant topology such as LLC or an active clamped flyback structure to achieve high efficiency, miniaturization, and EMI control. The selection of power MOSFETs is critical in such applications.

VAST SEMI's VAST MOS series, particularly the A and S series, are ideally suited for main switching and synchronous rectification applications in fast charging sources due to their:

Low on-resistance

Fast switching characteristics

Excellent EMI performance

These devices can support higher switching frequencies, thereby reducing the size of the transformer and output inductors and realizing higher power densities.