FAN9673QX

Overview

The FAN9673QX is an integrated three-channel continuous conduction mode (CCM) power factor correction controller IC designed for PFC pre-regulators. It implements leading-edge average current boost-type PFC circuits to ensure compliance with IEC1000-3-2 standards. The device supports interleaved operation to significantly reduce input and output ripple currents, simplifying EMI filtering. It features a programmable switching frequency range of 18 kHz to 40 kHz or 55 kHz to 75 kHz. The supply voltage is 15 V, with an operating temperature range from -40°C to 105°C. It is housed in a 32-LQFP package.

Feature Summary

• Interleaved three-channel CCM control architecture reduces input and output ripple currents for simplified EMI filtering.
• Innovative channel management allows secondary channels to load and unload smoothly based on CM pin voltage, improving transient response.
• Integrated protection mechanisms include peak current limiting, input voltage brownout detection, and TriFault Detect functionality.

Applications

• PFC pre-regulator designs
• Power supplies complying with IEC1000-3-2 regulations

Procurement Notes

Verify the specific suffix QX indicates tape and reel packaging when sourcing components. Confirm that this part number represents a discontinued status in current distributor inventories. Ensure design-in documentation references the original Fairchild Semiconductor datasheet specifications. Validate compatibility with existing 32-LQFP footprints during hardware replacement planning.

Selection Notes

Select this component for high-efficiency power factor correction applications requiring interleaved multi-phase control. The fixed current mode step-up topology suits designs needing strict harmonic distortion limits. Consider the available frequency ranges for optimizing magnetic component size. Evaluate the thermal performance within the specified industrial temperature range for robust system reliability.

Part Context

This device belongs to the FAN9673 family of power factor controllers manufactured by onsemi, formerly Fairchild Semiconductor. The FAN9673 series is engineered for advanced PFC applications, offering integrated solutions for complex power management requirements. The QX variant specifically denotes the reel packaging format for automated assembly processes.

Replacement Considerations

The FAN9673Q is the tray-packaged equivalent of this component. Verify functional equivalence if substituting between packaging types. No other direct cross-model replacements are documented in the provided data.