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TPS54260: 输出电压低

Part Number: TPS54260

输入28V,输出5V,实际在负载600欧姆情况下输出0.9V,负载13K情况下输出1.2V,且芯片很烫。电路参考TI仿真电路设计,只有续流二极管是在板上PH管脚附近后加的,不解,求教!