基于FSR2100設計的高效半橋諧振型電源技術

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。

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 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)

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