Block diagrams can be written, usually in boxes, with the headings input, process, and output. When planning how a circuit will function, these headings are then used to plan what the input, process ...
The schematic diagram below shows a flyback converter using the BJT controller LNK4004D. The circuit is designed to operate from 185 VAC to 290 VAC (withstand 440 VAC for indefinite time at full load) ...