Recently, two different ICs have encountered problems. Some primary-side feedback ICs are used as low-power power supplies. Most of them are below 10W. The load voltage of the power supply is higher than the no-load voltage? For example, a 15V 0.3A charger has a no-load voltage of 15V. This is easy to adjust, but during the test, the load voltage will become 15.6V 0.26A. What is the situation?
Venus 發表於 October 21, 2020
It seems to be an edge-controlled IC. The auxiliary winding of your transformer must be specially coupled to facilitate edge voltage sampling.
Maureen 發表於 October 21, 2020
Related to the transformer, it is mainly the transformer structure.
Tamsin 發表於 October 21, 2020
What topology? Does the primary side feedback collect the voltage of the primary side transformer? Could this be the cause of leakage?
