Circuits using the LMG341xR070 involve high voltage, potentially up to 600V. When laying out circuits using the LMG341xR070, understand the creepage and clearance requirements in your application and how they apply to the power stage. Functional (or working) isolation is required between the source and drain of each transistor, and between the high-voltage power supply and ground. Functional isolation or perhaps stronger isolation (such as reinforced isolation) may be required between the input circuitry to the LMG341xR070 and the power controller. Choose signal isolators and PCB spacing (creepage and clearance) distances which meet your isolation requirements.
If a heatsink is used to manage thermal dissipation of the LMG341xR070, ensure necessary electrical isolation and mechanical spacing is maintained between the heatsink and the PCB.