FAN4801SNY

Overview

The FAN4801SNY is a discontinued Power Factor Correction (PFC) and Pulse Width Modulation (PWM) controller combo IC manufactured by onsemi. Designed for high-efficiency power supplies, it integrates CCM PFC and PWM control functions within a single component to minimize external circuitry requirements. The device supports both current-mode and voltage-mode PWM operation, offering flexibility in design implementation. It features low operating current to reduce auxiliary power consumption and includes accurate maximum duty cycle limiting to extend operational lifespan. The unit is housed in a 16-pin DIP package suitable for through-hole mounting.

Feature Summary

• Integrates Continuous Conduction Mode (CCM) PFC and PWM controllers into a single chip
• Supports flexible PWM operation in either current-mode or voltage-mode configurations
• Features low quiescent current operation to minimize auxiliary power losses
• Includes precise maximum duty cycle limiting to ensure extended operational reliability

Applications

• High-efficiency AC-DC power adapters
• Desktop computer ATX power supplies
• Server and workstation power conversion systems
• General-purpose offline power supply designs

Procurement Notes

Verify the obsolete status of this component before initiating procurement. Confirm availability through authorized distributors or secondary market suppliers. Ensure that any replacement sourcing aligns with long-term support requirements. Check for RoHS compliance documentation if required for specific regulatory environments. Validate pin compatibility if substituting with newer generation devices from the same manufacturer family.

Selection Notes

Select this component for designs requiring integrated PFC and PWM control without separate discrete controllers. Consider its through-hole packaging for prototyping or applications where surface mount processes are not feasible. Evaluate the need for current-mode versus voltage-mode PWM based on system complexity and cost targets. Assess whether the lower operating current benefits justify the integration over older legacy parts like the ML4800.

Part Context

This part belongs to the FAN4800A/C and FAN4801/02 series, which were developed as successors to the ML4800 and original FAN4800 families. These controllers were engineered to provide enhanced efficiency and reduced external component counts compared to their predecessors. The series specifically addresses the needs for compact, high-performance power factor correction solutions in standard offline power applications.

Replacement Considerations

Public confirmed substitute part numbers: None identified.