Fairchild 公司的FSR2100是高度集成的高效半橋諧振型電源控制器，可簡化設計，提高生產力和改善性能。FSR2100集成了帶快速恢復體二極管的功率MOSFET，高邊柵極驅動電路，精確電流控制的振蕩器，頻率限制電流，軟起動和內置的保護功能，高達300kHz工作頻率，主要應用在PDP和LCD TV，臺式PC和服務器，適配器，通信電源和音頻電源。本文介紹了FSR2100主要特性，方框圖，典型應用電路圖(LLC諧振半橋轉換器)以及采用FSFR2100的LLC諧振半橋轉換器參考設計，主要特性和電路圖。

　　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

　　FSFR2100主要特性：

　　Variable Frequency Control with 50% Duty Cycle for Half-bridge Resonant Converter Topology

　　High Efficiency through Zero Voltage Switching (ZVS)

　　Internal SuperFETs 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)

　　FSFR2100應用：

　　PDP and LCD TVs

　　Desktop PCs and Servers

　　Adapters

　　Telecom Power Supplies

　　Audio Power Supplies

　　圖1。FSFR2100內部方框圖

　　圖2。FSFR2100典型應用電路圖(LLC諧振半橋轉換器)

　　采用FSFR2100的LLC諧振半橋轉換器參考設計

　　參考設計主要特性：

　　High efficiency ( >94% at 400VDC input)

　　Reduced EMI noise through zero-voltage-switching (ZVS)

　　Enhanced system reliability with various protection functions

　　圖3。采用FSFR2100的LLC諧振半橋轉換器參考設計電路圖