Hi All, I'm looking at the VN340SP-33-E datasheet (http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00060183.pdf). Now, I'm a little confused as to how this IC is controlled. It sounds to me like it is voltage controlled (because of the logic level table & because of the MOSFETs). However, in the diagram on the datasheet, they use a current limiting resistor Rin. Why is that resistor being used and how would I calculate the R value? Thanks.