1. Input Voltage Range: The range of input voltage within which the switching power supply can operate properly, typically specified by the minimum and maximum input voltage values.

2. Output Voltage: The stable voltage provided by the switching power supply to the load, usually specified as a DC voltage.

3. Output Current: The maximum current that the switching power supply can provide to the load while maintaining the stability of the output voltage.

4. Rated Power: The maximum power that the switching power supply can deliver stably, typically measured in watts (W).

5. Efficiency: The efficiency of the switching power supply, which is the ratio of output power to input power, typically expressed as a percentage. Higher efficiency means less energy loss and lower heat generation.

6. Ripple and Noise: The fluctuations and noise present in the output voltage of the switching power supply, usually measured in peak-to-peak value or millivolts (mV). Lower ripple and noise levels indicate a more stable output voltage.

7. Regulation: The ability of the switching power supply to maintain a stable output voltage despite variations in input voltage or load conditions. Regulation is usually specified as a percentage.

8. Protection Features: The protective functions that the switching power supply may have, such as overcurrent protection, overvoltage protection, overtemperature protection, etc., to ensure the safe operation of the power supply and the load.

9. Operating Temperature Range: The range of ambient temperatures within which the switching power supply can operate properly. Operating outside this range may affect the performance and lifespan of the power supply.

10. Size and Weight: The physical dimensions and weight of the switching power supply, which are important for installation and layout considerations.

These parameters are commonly used indicators for evaluating and selecting switching power supplies. The specific focus and requirements may vary depending on the application. By considering these parameters in relation to your specific application needs, you can choose the appropriate switching power supply model and specifications.