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2596-adj输出震荡

单片机控制Feedback点的电压,实现控制2596-adj的输出电压。以达到不同负载条件下,负载电流恒定为0.25A的目的。经过测试,负载电流为0.25A时,2596-adj的输出电压为17V、23.5V时均正常;2596-adj的输出电压为10V时,输出电压震荡。请问,什么原因导致的输出10V时的震荡问题?