A.Sudden load changes may cause noise to be emitted from magnetic parts such as transformers. Please pay attention to this when sudden load changes occur in LED dimming panels, etc.
If you hear other noise not related to this, please contact us (TDK-Lambda) for assistance.
Some products are equipped with intermittent operation (hereinafter referred to as "burst mode") to improve efficiency by switching the operation mode when load current demand is low.
When burst mode operates, the oscillation frequency is in the human audible frequency range, and therefore, sounds may be heard.
During burst mode operation, the oscillation frequency is in the human audible frequency range, and therefore, sounds may be heard.
This can be resolved by applying some output current.
Note that the sound caused by these do not affect the performance or reliability of the power supply.