Secondary Side Dual Output Controller with Integrated Opto Driver

摘要

To generate multiple isolated outputs, most systems use either multiple secondary windings or cascaded regulators for each additional output. Multiple secondary windings sacrifice regulation of the auxiliary outputs. Cascaded regulators require a larger inductor for the main output because all of the power is processed in series. By generating the auxiliary output (s) from the secondary winding of the main output, the LT~(~R)3804 allows for parallel processing of the output power. This minimizes the main output inductor size and directly regulates the auxiliary outputs. Also, with synchronous rectification, system efficiency is greatly improved.