3 Now That I Have Isolated CAN Signal Path, How Do I Generate Isolated Power?

Multiple options are available for isolated power generation for a CAN node. If the field side (for example, bus side) circuitry needs more power than just powering the CAN transceiver, push-pull transformer drivers like TI’s SN6505B driving an external transformer is a simple-to-use and low cost solution as shown in Figure 3-1. For space-constrained applications the ISOW1044 provides signal isolation, DC/DC converter, and a CAN FD transceiver in a single chip to reduce solution size and simplify the design process, as shown in Figure 3-2. Sometimes in certain industrial applications, such as DeviceNet, a 24-V supply is available on the field side which can be used as shown in Figure 3-3. To learn more on this topic, read the application brief, How to Isolate Signal and Power in Isolated CAN Systems

Figure 3-1 Isolated Power Generation Using Push-Pull Topology

Figure 3-2 Isolated Signal and Power Using Small Form-Factor ISOW1044

Figure 3-3 DeviceNet Application Schematic