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TPS54560负载能力比TPS54360更差

Other Parts Discussed in Thread: TPS54560, TPS54360

我们使用TPS54360通过48V变压为24V,电路如下图,由于负载增加,电流可能大于 TPS54360的额定电流3.5A,替换为TPS54560后,实际测试中如同等负载3A,TPS54560发热情况会比TPS54360大,上升到一定温度后电压输出变低为18V,而TPS54360则明显会好于TPS54560,,长时间测试24v输出无明显变化,为什么5A的芯片比不过3.5A的?电路一致,难道某些电阻/电容需要不一样?  需要注意什么地方?麻烦解答,谢谢