1)Why does the power supply fail when in use, but can be operated here after shutdown and restart?

RE: Generally, there are about two reasons for the power supply to shut down:

a)      The load is overload in a second and cause overload protection. It is recommended to increase the output power or modify the circuits design for overload;

b)      The temperature rise too high, and temperature protection has occurred.

The above situation will cause the power supply to enter the protection state and shut down, and the situation can be restored to normal after the restart.

2)Why does the power supply not turn on smoothly?

RE: When the load is motor, light bulb or capacitive load, the current is too large at the second of turning on. We suggest to use the product, for which overload protection mode is designed with fixed current method.

3)Why the fan of some ACDC SMPS not turn on?

RE: Cooling fan of some products uses temperature to control the rotation of the fan to extend the life of the fan when the internal product temperature does not reach the set temperature, thus the fan not turn on.

4)How to reduce the system between multiple power sources to form interference and big noise?

RE: When the switching power supply input is powered in series, there will be interface,  especially when multiple power supplies are connected in parallel, the method generally taken is to increase the filter circuit for both input and output, which can add the common mode inductance and X capacitance at the input end, and the output end add π filter.

5)Why is the ripple noise high in light load?

Re: In order to reduce the standby power consumption of the product and improve the light-load efficiency, AC-DC products operate in the skip cycle mode under light load conditions, when the ripple is relatively high, but the output voltage is stable.

Solution: In the light load (less than 10%) ripple is a normal phenomenon, if want to avoid the occurrence of this situation, it is recommended that to use the load is not less than 10%.

6)The AC/DC Converters produce instantaneous high current upon load access. Does this influence the module?

RE: If the large instantaneous current of the AC/DC Converters upon load access does not exceed the over-current protection point of the module, it will not have any impact on the module. See the datasheet for the over-current protection point of the module. If the current exceeds the over-current protection point of the module, the module will trigger the protection and voltage dip occur, and then recover.

7) Why does the mark of the products show 100VAC-240VAC while the datasheet shows 85VAC-264VAC?

RE: This is mainly for safety certification purposes. When certification authority tests product performance, they will make the input voltage range on the mark fluctuate by +10% and -15%, so the common practice in the industry is to set the input voltage range of 100VAC-240VAC on the mark.