Buck发热问题求教!!

MP1410 的IC,我改成5V/2A输出,但怎么改COMP和C7都只能带1A载,带到1.5A时IC几秒内就会很烫,且电压也降到4.4V
(我现在设C7=660uF,R1=10K,C5=68nF/10nF,C4=180pF或无,C3=10nF)
我怀疑是不是C3设错了,或是C4和C5用的不对,救命啊!
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