高精密、高性价比双路稳压电源的研制

采用同步降压控制器LM5119芯片和贴片式低损耗MOS场效应管及正激拓扑设计而成的输出低电压、大电流DC/DC降压型直流双路稳压开关电源。由滤波电路、同步控制电路、DC/DC Buck电路组成,滤波电路采用并联电容的方式降低纹波电压。经测试,本电源的效率大于92%,纹波系数0.063%-0.238%,负载效应0.0889%,源效应0.0056%-0.011%。各项性能指标均优于市售产品水平。

A low voltage, high current Buck DC/ DC switching power supply with a synchronous buck controller LM5119 core and a low loss MOSFET and a forward topology is designed. It is composed of a filter circuit, a synchronous control circuit and a DC/DC Buck circuit. The filter circuit uses the parallel capacitor to reduce the ripple voltage. After testing, the efficiency of the power supply is greater than 92%, the ripple factor 0.063%-0.238%, the load effect of 0.0889%, the source effect 0.0056%-0.011%. The performance indicators are better than the marketed product level.