FAN4800AUM

Overview

The FAN4800AUM is a discontinued Power Factor Correction (PFC) and PWM combo controller from onsemi, designed for boost PFC and PWM power supplies. It operates in Continuous Conduction Mode (CCM) with a typical switching frequency of 64 kHz. The device supports both current-mode and voltage-mode PWM operation. It features low operating current to reduce external component power dissipation compared to previous generations. The unit is housed in a 16-lead Small Outline Package (SOP) and is rated for an operating temperature range of -40°C to +105°C.

Feature Summary

• Integrates PFC and PWM control functions into a single chip for simplified design.
• Supports CCM PFC operation with accurate maximum PWM duty cycle limiting.
• Includes UVLO protection and PFC soft-start functionality absent in legacy models.

Applications

• Power supplies utilizing boost PFC stages combined with downstream PWM regulation.
• Universal input AC/DC converters requiring high power factor correction.
• Applications necessitating low standby power consumption through reduced quiescent current.

Procurement Notes

Verify the obsolete status of the FAN4800AUM before procurement planning. Confirm that the SOP-16 package matches the target PCB footprint. Ensure that the 64 kHz switching frequency aligns with existing magnetic component designs. Review the datasheet for required external component adjustments when replacing older ML4800 or FAN4800 variants.

Selection Notes

Select this component for designs requiring integrated PFC and PWM control in a compact SOP package. It is suitable for applications prioritizing lower operating current over legacy performance. Consider the 64 kHz fixed frequency characteristic for EMI filtering requirements. Verify compatibility with boost topology constraints and ensure thermal management supports the specified industrial temperature range.

Part Context

The FAN4800AUM belongs to the FAN4800 family of power management ICs. This series represents an evolution over the ML4800 and original FAN4800, adding features like UVLO and soft-start while reducing operating current. The 'A' suffix typically denotes specific electrical characteristics or revisions within the FAN4800 line, distinct from the standard FAN4800C or FAN4802 variants.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The FAN4800AUM is listed as discontinued. Designers should consult official replacement guides or contact the manufacturer for direct alternatives, as generic cross-references may not account for the added UVLO and soft-start features present in this revision.