想用TPS54560做输入电压为12V,输出5V 5A的电源,原理图是按照手册中22页的图35设计的,只是没有布PCB 用面包板搭的,二极管用的B560C 电感用的7.5uH 饱和电流为6A ,空载时输出5V ,但接入5.1欧电阻时电压降为0.5V 电流也只有50mA,当去掉电阻后,电压又恢复5V,这是怎么回事?
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