Fairchild 公司的FSR2100是高度集成的高效半桥谐振型电源控制器，可简化设计，提高生产力和改善性能。FSR2100集成了带快速恢复体二极管的功率MOSFET，高边栅极驱动电路，精确电流控制的振荡器，频率限制电流，软起动和内置的保护功能，高达300kHz工作频率，主要应用在PDP和LCD TV，台式PC和服务器，适配器，通信电源和音频电源。本文介绍了FSR2100主要特性，方框图，典型应用电路图(LLC谐振半桥转换器)以及采用FSFR2100的LLC谐振半桥转换器参考设计，主要特性和电路图。

　　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应用：

　　PDP and LCD TVs

　　Desktop PCs and Servers

　　Adapters

　　Telecom Power Supplies

　　Audio Power Supplies

　　图1。FSFR2100内部方框图

　　图2。FSFR2100典型应用电路图(LLC谐振半桥转换器)

　　采用FSFR2100的LLC谐振半桥转换器参考设计

　　参考设计主要特性：

　　High efficiency ( >94% at 400VDC input)

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

　　Enhanced system reliability with various protection functions

　　图3。采用FSFR2100的LLC谐振半桥转换器参考设计电路图