FAN7621SJX

AC DC Converters, Offline Switchers Overview

The FAN7621SJX is a pulse frequency modulation (PFM) controller designed for high-efficiency half-bridge resonant converters. It integrates variable frequency control with a fixed 50% duty cycle, supporting operating frequencies up to 300 kHz. The device enables zero voltage switching (ZVS) and includes programmable pulse skipping for light-load frequency limiting. Key protection features include over-voltage, overload, over-current, abnormal over-current, and internal thermal shutdown. It operates within a specified temperature range of -40°C to +130°C.

AC DC Converters, Offline Switchers Feature Summary

• Enables zero voltage switching for high efficiency in half-bridge resonant topologies
• Integrates comprehensive protection mechanisms including OVP, OCP, and thermal shutdown
• Supports remote on/off control via the CON pin
• Features programmable pulse skipping to manage frequency limits under light-load conditions

AC DC Converters, Offline Switchers Applications

• High-efficiency LED street lighting power supplies
• Half-bridge resonant converter designs
• AC/DC conversion systems requiring robust protection

AC DC Converters, Offline Switchers Procurement Notes

Verify component authenticity through authorized distribution channels due to potential availability constraints. Confirm package integrity upon receipt, as the SOP-16 form factor requires careful handling. Cross-reference datasheet revisions to ensure compatibility with existing design specifications. Note that lifecycle status may affect long-term supply continuity.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for applications demanding high efficiency through ZVS implementation in half-bridge resonant structures. Ensure input voltage ranges align with the specified maximum limits. Evaluate thermal management requirements given the wide operating temperature range. Verify that external component values support the fixed dead time and frequency parameters defined in the official documentation.

AC DC Converters, Offline Switchers Part Context

This component belongs to the FAN7621 series of PFM controllers originally developed by Fairchild Semiconductor and subsequently maintained by onsemi following corporate acquisition. The series is engineered specifically for resonant converter applications, offering integrated control logic to simplify design complexity while maintaining performance standards for industrial and commercial power supplies.

AC DC Converters, Offline Switchers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.