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开关电源输出DC5V有时稳,有时不稳哪问题?
先确定负载有没有突变,电感上有没有过流;都没有的话再检查下环路参数。
这样提问只能告诉你你的电源存在问题,如要解决最好提供完整的电路图及测试条件才好分析。