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如何让UC3843不工作

Other Parts Discussed in Thread: UC3843

用UC3843来设计DC-DC电路,输入电压为24和220V,设计思路如下:当输入为24V时,UC3843工作,当输入电压为220V时,UC3843不工作,请问该怎么控制这个UC3843不工作呢~谢谢~