SG6980SZ

Overview

The SG6980SZ is a single-stage power factor correction (PFC) controller manufactured by Fairchild Semiconductor. It integrates average current mode control for PFC and PWM for flyback conversion in a single IC. The device operates at a fixed switching frequency of 65 kHz. It is housed in a 16-pin SOP package. Key electrical characteristics include a minimum input voltage of 11V. The component is designed to simplify the design of high-power-factor, high-efficiency AC-DC adapters.

Feature Summary

• Integrates single-stage PFC and flyback PWM control functions
• Utilizes average current mode control technique
• Features fixed 65 kHz switching frequency operation

Applications

• High-power-factor AC-DC adapters
• Single-stage power supply designs
• Flyback converter applications requiring PFC

Procurement Notes

Verify the manufacturer status as the SG6980SZ may be listed as obsolete or superseded by onsemi products following corporate acquisitions. Confirm pin compatibility and functional equivalence if sourcing from third-party distributors. Ensure the datasheet version matches the specific manufacturing lot requirements for critical automotive or industrial certifications.

Selection Notes

Select this component for designs requiring integrated PFC and regulation without separate controllers. Consider the 16-pin SOP package constraints for PCB layout. Evaluate thermal performance given the integration of two control loops. Verify that the 65 kHz frequency aligns with EMI filtering requirements and transformer design specifications for the target application.

Part Context

This part belongs to the SG69xx series of green-mode controllers from Fairchild Semiconductor. These components are designed for high efficiency and low standby power consumption. The SG6980 specifically targets single-stage solutions, reducing component count compared to traditional two-stage PFC plus isolated DC-DC architectures.

Replacement Considerations

Check for direct equivalents from onsemi, which acquired Fairchild's semiconductor business. Verify pin-to-pin compatibility with any proposed substitute. Review updated datasheets for potential changes in absolute maximum ratings or thermal characteristics.