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基于LM5017的BUCK电路带负载后输出电压降低(负载调整率高),求大伙帮忙看看!



应用要求:输入DC26~60V,输出24V、0.6A    使用Webench设计的电路:

R6实际焊接的是2.2欧。

在测试样品的时候发现,空载输出电压为26.5V  带上68欧/25W的电阻后电压变为24.01V !

请各位大侠帮忙看看,指点下解决思路,谢谢~

以下为PCB及SW脚波形图: