原标题：Microchip dsPIC33F 200W DC-DC LLC参考设计

　　microchip 公司的200W DC/DC LLC谐振转换器参考设计采用dsPIC33F系列DSC器件，输入电压范围350-420Vdc，正常输入电压400V，12V DC输出，初级和次级有高的绝缘电压(4kV)。高效率是采用半桥转换器的零电压开关(ZVS)和同步整流器的零电流开关(ZCS)。效率达95%，输出功率200W，谐振频率210kHz。调整频率150kHz–230kHz.本文介绍了200W DC/DC LLC谐振转换器参考设计主要特性和指标，方框图，反激电路图以及200W DC-DC LLC参考设计电路图和材料清单(BOM)。

　　DC/DC LLC Reference Design Using the dsPIC® DSC

　　DC/DC LLC RESONANT CONVERTER Reference Design

　　Microchip’s 200W DC/DC LLC Resonant Converter Reference Design operates over a wide input voltage range (350 - 420Vdc) with a nominal input of 400V, providing a 12V DC output, while maintaining high-voltage isolation between the primary and secondary. High efficiency is achieved through Zero Voltage Switching (ZVS) on the half-bridge converter and Zero Current Switching (ZCS) on the synchronous rectifier. A synchronous rectifier is implemented over the traditional full wave rectifier for improved efficiency. The LLC Resonant Converter Reference Design utilizes Microchip’s digital power conversion dsPIC for unique “adaptive” control of the half-bridge converter and synchronous rectifier.

　　This reference design is implemented using a single dsPIC33F “GS” digital-power DSCs from Microchip that provides the full digital control of the power conversion and system management functions. As shown in this reference design the dsPIC33F ‘GS’ devices enable designers to easily and cost effectively create products using advanced switching techniques such as LLC that lower switching losses and enable efficiencies as high as 95%. The DC/DC LLC Converter Reference Design is royalty free when used in accordance with the licensing agreement.

　　200W DC-DC LLC参考设计主要特性：

　　Low power consumption at no load

　　Programmable soft-start

　　Voltage, Current, Temperature monitoring & Protection

　　Primary and secondary MOSFET control

　　Full Digital Control

　　200W DC-DC LLC参考设计指标：

　　Efficiency greater than 95%

　　Wide Input Range: 350Vdc – 420V DC

　　Output Power: 200W

　　Output Voltage: 12V

　　Resonant Frequency: 210kHz

　　Modulated Frequency : 150kHz – 230kHz

　　4kV input to output isolation

　　图1。200W DC-DC LLC参考设计外形图

　　图2。200W DC-DC LLC参考设计外形图方框图

　　200W DC-DC LLC参考设计指标：

　　图2。LLC电路元件和分段图

　　图3。高压绝缘图

　　图4。高档LLC转换器方框图(D：MOSFET驱动器，A：放大器)

　　图5。反激电路图

　　图6。辅助高效降压稳压器

　　图7。200W DC-DC LLC参考设计电路图(1)

　　图8。200W DC-DC LLC参考设计电路图(2)