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 3-4. To learn more on this topic, read the application brief, How to Isolate Signal and Power in Isolated CAN Systems. Device Update: ISOW1050 is the latest release for Isolated CAN with Integrated Power for Cost optimized systems to achieve best EMC performance. To improve your design using ISOW1050 see Enhance Design Performance using Integrated Power and Digital Isolation Design. To achieve best EMC performance with ISOW1050, see Achieving Best EMC Performance for Signal Isolators with Integrated Power

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 Isolated Signal and Power Using ISOW1050 for Best EMC

Figure 3-4 DeviceNet Application Schematic