Optocoupler components are widely used in electrical insulation, level translation, interstage coupling, drive circuits, switching circuits, choppers, multivibrators, signal isolation, interstage isolation, pulse amplification circuits, digital instruments, long-distance signal transmission, pulse amplification, solid state relays (SSR), instrumentation, communication equipment and MEMS interfaces.
In a monolithic switching power supply, a linear optocoupler can be used to form an optocoupler feedback circuit, and the duty cycle can be changed by adjusting the current at the control end to achieve the purpose of precision voltage regulation.