利用5430芯片手册中的这个图做24V转5V的辅助电源，5脚ENA悬空，B340A用SR360替代，电感是用181的贴片电感，R1用10K精密滑变，R2用2.7K，其它没有改变。
直流稳压源上24V时，打开电源，直流源上示数从24V立马上到36V左右,然后又立马降到5V左右，然后，用手触摸芯片，非常烫。
想请问是哪里出了问题。
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