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LM2596实际运用的一些问题

Other Parts Discussed in Thread: LM2596

为什么我用LM2596电源芯片做一个ADJ电源,输入为24V,输出可调,电路为手册上的典型电路,电容电感参数也是按照手册选取的,负载时输出电压会被稳定地拉低300mv,例如调节电位器使空载输出电压为8V,但是当接了负载时,负载俩端的电压确只有7.85V?谢谢各位大神们帮忙解释一下什么原因啊!!