FA5591N. Assembly/installation: surface-mounted component (SMD). Function: Power Supply Control IC. Housing (according to data sheet): SO-8. Housing: SO. Marking on the case: 5591. Note: Power Factor Correction (PFC). Number of terminals: 8. RoHS: yes. Spec info: Startup Threshold--13V. VCC: 28V. Original product from manufacturer: Fuji Electric. Quantity in stock updated on 11/13/2025, 13:03