FSL337LRN

AC DC Converters, Offline Switchers Overview

The FSL337LRN is a highly integrated, current-mode PWM controller manufactured by onsemi. It features a built-in 700 V MOSFET and is designed for low-power offline AC-DC flyback applications. The device integrates Pulse Width Modulation (PWM) control with a SenseFET, specifically engineered for high-performance offline buck, buck-boost, and non-isolated topologies. This integration reduces component count and simplifies design implementation for power management systems requiring efficient switching capabilities.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a 700 V MOSFET with current-mode PWM control
• Supports multiple converter topologies including flyback, buck, and buck-boost
• Combines PWM controller and SenseFET for simplified design

AC DC Converters, Offline Switchers Applications

• Low-power offline AC-DC flyback converters
• Offline buck converter designs
• Buck-boost topology implementations

AC DC Converters, Offline Switchers Procurement Notes

Verify the lifecycle status before procurement as the FSL337LRN is listed as End of Life and scheduled for obsolescence by the manufacturer. Confirm package type availability through authorized distributors. Ensure replacement components are evaluated for compatibility if continued production is required for long-term supply chain stability.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring integrated high-voltage switching in compact form factors. The built-in MOSFET eliminates external switch requirements, reducing board space and BOM complexity. Consider its suitability for low-power applications where efficiency and integration levels are prioritized over discrete component flexibility.

AC DC Converters, Offline Switchers Part Context

This part belongs to onsemi's portfolio of power management solutions, specifically within the offline switch category. It represents a trend toward highly integrated power controllers that combine sensing and switching elements to enhance performance while minimizing external component dependencies in consumer and industrial power supplies.

AC DC Converters, Offline Switchers Replacement Considerations

Check for official substitute part numbers from onsemi or compatible alternatives from other manufacturers. Evaluate electrical parameters such as voltage rating and current mode control characteristics to ensure functional equivalence in existing circuit designs.