FSFR2100 − FSFR2100 for 450W - Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converters


The FSFR2100 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 FSFR2100 simplifies designs and improves productivity, while improving performance. The FSFR2100 combines power MOSFETs with fast-recovery type body diodes, a highside gate-drive circuit, an accurate current controlled oscillator, frequency limit circuit, soft-start, and built-in protection functions. The high-side gate-drive circuit has a common-mode noise cancellation capability, which guarantees stable operation with excellent noise immunity. The fast-recovery body diode of the MOSFETs improves reliability against abnormal operation conditions, while minimizing the effect of the reverse recovery. Using the zero-voltage-switching (ZVS) technique dramatically reduces the switching losses and efficiency is significantly improved. The ZVS also reduces the switching noise noticeably, which allows a small-sized Electromagnetic Interference (EMI) filter.

The FSFR2100 can be applied to various resonant converter topologies, such as: series resonant, parallel resonant, and LLC resonant converters.

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Product Status/Pricing/Packaging

Product Product & Eco Status *Pricing Packaging & Packing Info **Package Marking Convention Qualification Support Compliance Certificates
0 FSFR2100 Full Production
Green as of Nov 2010
$5.29  Details
3.2 x 26 x 10.5mm

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&E (Space)
&3 (3-Digit Date Code)
Line 2:FSFR2100
RƟJC :  10.44  °C/W


  • Variable Frequency Control with 50% Duty Cycle for Half-Bridge Resonant Converter Topology
  • High Efficiency through Zero Voltage Switching (ZVS)
  • Internal SuperFET®s with Fast-Recovery Type Body Diode (trr=120ns)
  • Fixed Dead Time (350ns) Optimized for MOSFETs
  • Up to 300kHz Operating Frequency
  • Pulse Skipping for Frequency Limit (Programmable) at Light-Load Condition
  • Remote On/Off Control Using Control Pin
  • Protection Functions: Over-Voltage Protection (OVP), Over-Load Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD)


  • PDP TV
  • LCD TV
  • Desktop PC
  • Server
  • Video Game Console
  • Home Audio System Components

Application Notes


FSFR2100 Demo - Fairchild Power Switch (FPS™) for Half-Bridge Resonant Converters

FSFR2100 - LLC Resonant Converter Solutions

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Reference Designs

Application Document Number Featured Products Output
Power Supply LCD TV RD-212 FSFR2100, FSFR2100XS, KA431A 192W 340-400V/DC LLC Resonant Half-Bridge Converter

Design Tools

Design Tool Design Tool
Resonant Converters - LLC Design Tool for FSFR Series New Excel-based design tool for FSFR-series resonant converters. Used for high frequency design with resonant frequency up to 300kHz and softstart frequency up to 600 kHz.

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