基于DPA426R的低压大电流DC/DC变换器

设计了一种基于集成开关电源控制芯片DPA426R的高频DC/DC变换器,输出5V/14A.电路采用单端正激拓扑结构,反馈环路为电压控制模式.针对开关变换器的主要功能模块电路进行了设计和工作原理分析.为了提高开关电源的功率密度,初级控制电路的设计基于高集成度的电源管理芯片DPA426R,输出整流电路采用自驱动同步整流结构...

Low-voltage high-current DC-DC converter based on DPA426R

A 5 V / 14 A high-frequency DC-DC converter is designed based on IC DPA426R,which adopts the single-ended forward topology and voltage control mode.The circuit design and operating principle of its main functional modules are analyzed.Its primary control circuit is designed based on IC DPA426R to improve its power density,the self-driven synchronous rectifier is adopted in its output circuit,the LCD lossless reset circuit is applied to reset the flux of high-frequency transformer,and the built-in integrated circuits of DPA426R are used to realize the protective functions:line over / under-voltage,overload,open-loop fault and thermal shutdown.Experimental results show that the output voltage of the designed converter has high precision,small ripple and up to 88 % efficiency,suitable for low-voltage high-current load devices.