To increase the reliability of the switching power supply, we suggest users choose a unit that has a rating of 30% more power than actual need. For example, if the system needs a 100W source, we suggest that users choose a switching power supply with 130W of output power or more. By doing this, you can effectively boost the reliability of the switching power supply in your system.
We also need to consider about ambient temperature of the power supply and whether there is an additional device for dissipating the heat. If the power supply is working in a high-temperature environment, we need to derate the output power.
Choosing functions based on your application:
Protection functions: Over Voltage Protection (OVP), Over Temperature Protection (OVP), Over Load Protection (OLP), etc.
Application functions: Signaling Function (Power Good, Power Fail), Remote Control, Remote Sensing, etc.
Special functions: Power Factor Correction (PFC), Un interrupable Power Supply (UPS) Function.
Make sure that the model qualifies for the safety standards and EMC regulations you need.