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TPS54560做的一个正电压转负电压的电路,芯片和二极管发热严重,请帮忙分析分析,谢谢!

电路如下,PCB布局都是按照推荐LAYOUT来的,空载没什么问题,在带到1A左右的负载后芯片和二极管就烫的不行了,请大神帮忙分析下原因