FAN4803CS1X

Overview

The FAN4803CS1X is an integrated Power Factor Correction (PFC) and Pulse Width Modulation (PWM) controller combo IC manufactured by onsemi. It operates in average current mode with a fixed switching frequency of 67 kHz. The device supports a supply voltage range of 10 V to 15 V and features a typical start-up current of 200 µA. It is housed in an 8-SOIC package with a width of 3.90 mm. The component is designed for surface mount installation and functions within an operating temperature range of 0°C to 70°C.

Feature Summary

• Integrates PFC and PWM controllers into a single 8-pin package to reduce board space.
• Utilizes patented one-pin voltage error amplifier with advanced input current shaping.
• Combines synchronized leading-edge PFC modulation with trailing-edge PWM control.
• Includes overvoltage protection, UVLO, brownout protection, and PFC soft start.

Applications

• Power factor corrected switched mode power supplies
• AC-DC adapters requiring IEC1000-3-2 compliance
• Applications utilizing smaller bulk capacitors

Procurement Notes

Verify the obsolete status of this component before design finalization. Confirm that the specific suffix indicates the tape and reel packaging variant. Ensure compatibility with existing PCB footprints for the 8-SOIC package. Check for any pending process change notifications or environmental compliance updates from the manufacturer.

Selection Notes

Select this component for designs prioritizing compact form factors due to its integrated dual-controller architecture. Consider the fixed 67 kHz frequency when designing magnetic components. Evaluate the low start-up current requirements against system power constraints. Verify that the 8-SOIC package meets thermal dissipation needs for the target application load.

Part Context

This part belongs to the FAN4803 series of PFC/PWM controller combos. It shares functional similarities with other models in the family but differs in packaging and specific electrical characteristics. The CS1X designation typically denotes the tape and reel version of the standard SOIC-8 packaged device.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official replacement guides or contact the manufacturer directly for qualified alternatives.