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LM5117的BUCK电路带负载后输出电压降低



请大家给我指点一下谢谢!

输入 24V

输出  5V  9A

开关频率  227KHZ

下面是我的原理图,根据webench修改的

电源在带载后电压跌落很快,且电感容易饱和,在开机下电,第二次上电后电感就会叫,电感参数为:

6.80uH     DCR:15mΩ     Irms : 11.50A  Isat : 18A   请大家给我指点一下谢谢啦

下面是PCB  共四层  第二层和第三层为GND