1 Switch power input and output types

2 input voltage

There are three commonly used input voltage specifications: 110V, 220V, and universal input voltage (AC: 85V-264V). The input voltage specification should be selected based on the region of use.

3 Output voltage and current

When choosing a switching power supply, the voltage should be the same first, followed by the current. The rated current of the switching power supply must be greater than the maximum current of the load. For example, if your circuit is 15V or 60mA, it is generally recommended to choose a power supply that is above 100mA. In addition, as long as the voltage is the same, regardless of how much current the switching power supply provides compared to the actual use, the circuit will only pass through so much without any damage.

4-switch power supply function

5 Switching power supply load characteristics

In order to improve the reliability of the system, it is recommended to operate the switching power supply at a load of 50 percent -80 percent , that is, select a model with an output power rating of approximately 30 percent more. For example, if the power used is 20W, a switching power supply with an output power of 25W-40W should be selected. If the load is a motor, light bulb, or capacitive load, and the current is high at the moment of starting, a suitable power source should be selected to avoid overload.

6 ambient temperature