FAN4803CS2

Overview

The FAN4803CS2 is an obsolete PFC and PWM controller combo IC from onsemi, housed in an 8-SOIC package. It integrates internally synchronized PFC and PWM functions within a single chip to support power factor corrected switched-mode power supplies. The device operates at a switching frequency of 67 kHz with a supply voltage range of 10V to 15V. It features average current mode control and a typical start-up current of 200 µA. Designed for surface mount installation, it supports continuous boost topology with leading-edge PFC modulation.

Feature Summary

• Integrates internally synchronized PFC and PWM controllers in a compact 8-pin package
• Utilizes patented one-pin voltage error amplifier with advanced input current shaping technique
• Supports peak or average current continuous boost operation with leading-edge PFC
• Provides high-efficiency trailing-edge current mode PWM with synchronized modulation

Applications

• Power factor corrected switched-mode power supplies
• AC-DC converter designs requiring IEC1000-3-2 compliance
• Applications utilizing smaller bulk capacitors to reduce line loading

Procurement Notes

This component is officially marked as obsolete by the manufacturer. Distribution channels indicate restricted availability or discontinuation. Verify end-of-life status and lead times carefully before design-in. Consider alternative sourcing strategies due to limited stock and potential supply chain constraints associated with discontinued semiconductor products.

Selection Notes

Select this part only for legacy system maintenance or specific historical designs requiring the exact 8-SOIC form factor and 67kHz frequency. Evaluate thermal performance within the 0°C to 70°C operating range. Ensure compatibility with the 10V to 15V supply voltage window. Review datasheet specifications for UVLO and brownout protection thresholds relative to system requirements.

Part Context

The FAN4803 series belongs to onsemi's portfolio of space-saving controller solutions for power factor correction. It combines PFC and PWM functionalities to simplify circuit design and reduce component count. The CS2 variant specifically denotes the 8-SOIC surface-mount package configuration, distinguishing it from other pin-out or packaging options within the broader product family.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the product is obsolete, engineers must identify functional equivalents based on pin compatibility, electrical parameters, and package dimensions through independent technical cross-reference tools.