请教各位大侠：
我用WEBENCH设计了个电路，5v输入3.3V 5A输出电源，但是电源输出电流达不到要求，一加上负载电源就鸣叫，电压被拉低。负载电流并不大，2A都不到。但是使用8V以上输入就能够正常工作。为何呢？这款电源能做低压差的DC-DC吗？
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