For best operational performance of the device, use good printed-circuit board (PCB) layout practices, including:

• Reduce parasitic coupling by running sensitive traces, such as the MID connection, as far away from supply lines or noise sources as possible. If these traces cannot be kept separate, crossing the sensitive trace perpendicular is much better as opposed to in parallel with the noisy trace.
• Power dissipated in the RES80A-Q1 causes the junction temperature to rise. For reliable operation, junction temperature must be limited to 150°C, maximum. Maintaining a lower junction temperature results in higher reliability.
  • Package thermal resistance, R_θJA, is affected by mounting techniques and environments. Poor air circulation can significantly increase thermal resistance to the ambient environment. Best thermal performance is achieved by soldering the RES80A-Q1 onto a circuit board with wide printed circuit traces, especially for the LVIN connection, to allow greater conduction through the device leads.
• Use groove cutting to achieve an improved PCB creepage distance. For grooves wider than 1mm, the effective creepage distance is the existing creepage distance plus the width of the groove and twice the depth of the groove. This sum must equal or exceed the required creepage distance. The groove must not weaken the substrate to the point of failure to meet mechanical test requirements. All layers under the groove must be free from traces, vias, and pads to maintain the maximum creepage distance.
• Clean the PCB after board assembly for best performance. Residual flux can create parasitic leakage paths and reduce effective creepage distances.
• Any precision integrated circuit can experience performance shifts resulting from moisture ingress into the plastic package. Following any aqueous PCB cleaning process, bake the PCB assembly to remove moisture introduced into the device packaging during the cleaning process.
  • A low temperature, post-cleaning bake at 85°C for 30 minutes is sufficient for most circumstances.
• Use conformal coating or potting, the deposition of an insulating polymer or other material layer over an assembled PCB, to further improve the pollution degree around the RES80A-Q1. This process reduces the requirements for creepage and clearance distances by eliminating or reducing the influence of pollutants.