FAN7930CMX

Overview

The FAN7930CMX-G is a critical conduction mode (CrCM) power factor correction controller from onsemi, designed for boost PFC applications. It utilizes voltage mode PWM to generate MOSFET off signals by comparing an internal ramp with the error amplifier output, eliminating the need for input voltage sensing networks and reducing power loss. The device integrates comprehensive protection features including overvoltage protection (OVP), feedback open-loop protection, overcurrent protection (OCP), undervoltage lockout (UVLO) with 3.5V hysteresis, and input voltage missing detection. A PFC-ready pin triggers other power stages when output voltage reaches the correct level. It employs a variable on-time control method to achieve lower total harmonic distortion compared to traditional CrCM controllers.

Feature Summary

• Voltage mode PWM control eliminates input voltage sensing network power loss
• Integrated protection against overvoltage, overcurrent, and feedback open-loop conditions
• PFC-ready signal enables synchronized triggering of downstream power stages
• Variable on-time control method optimizes total harmonic distortion performance

Applications

• Critical conduction mode boost power factor correction circuits
• Active power factor correction systems requiring low THD
• Power supplies with synchronized multi-stage power management

Procurement Notes

Verify the complete part number includes the suffix '-G' for lead-free compliance as indicated in official documentation. Confirm package type is SOP-8. Ensure design accounts for the specific UVLO hysteresis and OVP thresholds defined in the datasheet. Cross-reference the manufacturer's latest revision history for any functional updates before finalizing procurement specifications.

Selection Notes

Select this component for designs prioritizing efficiency gains from voltage mode control over current mode alternatives. It is suitable for applications where minimizing input sensing circuitry complexity is beneficial. Consider the integrated soft-start and THD optimizer for meeting regulatory standards without external compensation components. Verify compatibility with the required switching frequency range and operating temperature specifications.

Part Context

This controller belongs to the FAN7930C series of CrCM PFC controllers. It shares architectural similarities with related models but is distinguished by its specific integration of voltage mode control and protection features. The series is designed to address efficiency and cost reduction in power factor correction applications through simplified control loops and reduced component count.

Replacement Considerations

Check for direct substitutes within the same family or compatible CrCM controllers. Verify pinout compatibility and electrical parameter alignment, particularly regarding UVLO thresholds and peak gate drive currents. Ensure any replacement maintains the required protection features and control methodology for the specific application design.