HCNR200 and HCNR201: Applications in Motor Drive and Current Loop

This note covers operation and applications of the HCNR200 and HCNR201 high-linearity analog optocouplers. Internal operation and the servo control mechanism of the optocouplers are described in detail. A couple of application examples are presented, ranging from motor control current sensing to traditional current loop communication in process control. The evaluation board for these optocouplers is also introduced in this note.