Hi, I am considering to use the ADuM3190 to develop a power board based on the primary side control. the controller can be placed on the primary side (side 1) and control the output on the secondary side (side 2). By placing the controller on the primary side, some isolated sensing circuits, isolated auxilliary power supply can be removed. however, I found the VDD2 for the side 2 of 3190 also needed an additional DC voltage. Is it correct? so that means I also need to have the isolated auxilliary power supply to feed the VDD2?