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LM5576电源转换效率低,如何解决?

Other Parts Discussed in Thread: LM5576, LM5574

      使用LM5576芯片进行电源转换,输入电源采用12V直流供电、POE48V供电两种方式,输出3.3V。调试过程中发现,芯片输出3.3V正常,负载电流150mA@3.3V,但是转换效率奇低:12V供电时不到40%,POE48V供电时更低仅有百分之十几。另外,发现电感电压不是标准方波,有较大纹波,并且有2V直流成分;斜波也不是很理想。设计完全参照官方推荐电路,不知各位大神有谁遇到相似问题?