Switching power supply unit, and electronic apparatus incorporating the same

摘要

A switching power supply unit and an electronic apparatus including the same, has a photocoupler that is used for providing feedback from the secondary side to the primary side. The photocoupler is shielded by a heat sink so that incorrect operation of the photocoupler caused by electromagnetic waves emanating from cellular phones or other electronic apparatuses is prevented, thereby preventing incorrect operation of the switching power supply unit and the electronic apparatus.