FSFR1800HSL Datasheet

Advanced Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converters


The FSFR-HS is a highly integrated power switch designed for high-efficiency half-bridge resonant converters. Offering everything necessary to build a reliable and robust resonant converter, the FSFR-HS simplifies designs while improving productivity and performance. The FSFR-HS combines power MOSFETs, a high-side gate-drive circuit, an accurate current controlled oscillator, and built-in protection functions.

Variable Frequency Control with 50% Duty Cycle for Half-Bridge Resonant Converter Topology
High Efficiency through Zero Voltage Switching (ZVS)
Built-in High-Side Gate Driver IC
Internal UniFET™s with Fast-Recovery Type Body Diode (trr=160ns Typical)
Fixed Dead Time (350ns) Optimized for MOSFETs
Operating Frequency Up to 600kHz for Soft-Start
Self Auto-Restart Operation for All Protections, Despite External LVCC Bias
Line UVLO with Programmable Hysteresis Level
Simple On/Off with Line UVLO Pin
Easy Configuration and Compatibility with FAN7930 for Line UVLO without External Components
Protection Functions: Over-Voltage Protection (OVP), Over-Current Protection (OCP), Abnormal Over Current Protection (AOCP), Internal Thermal Shutdown (TSD)

Desktop PCs and Servers
Telecom Power Supplies



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Manufacturer information


Fairchild has a rich history as a pioneer in the semiconductor industry and that pioneering spirit endures today. In an era where diversity can dilute focus and hamper innovation, we specialize in the development and manufacturing of a complete portfolio of low- to high-power solutions for the mobile, industrial, cloud, automotive, lighting, and computing industries. Fairchild is one of the most reliable partners in the industry, offering the shortest time from concept to silicon, expert FAEs for customer support, and a flexible, multi-source supply chain. Our vision is clear – anticipate the power efficiencies demanded by tomorrow’s electronic products and deliver an amazing design experience

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